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Braindumps.300-101.

82 Questions
Number: 300-101
Passing Score: 800
Time Limit: 120 min
File Version: 19.2

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300-101
Implementing Cisco IP Routing

Topic 1, Network Principles
Sections
1. Network Principles
2. Layer 2 Technologies
3. Layer 3 Technologies
4. VPN Technologies
5. Infrastructure Security
6. Infrastructure Services

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Exam A
QUESTION 1
Refer to the exhibit.

Based on this FIB table, which statement is correct?
A.
B.
C.
D.

There is no default gateway.
The IP address of the router on FastEthernet is 209.168.201.1.
The gateway of last resort is 192.168.201.1.
The router will listen for all multicast traffic.

Correct Answer: C
Section: Network Principles
Explanation
Explanation/Reference:
Explanation:
The 0.0.0.0/0 route is the default route and is listed as the first CEF entry. Here we see the next hop for this default route lists 192.168.201.1 as the default router
(gateway of last resort).

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QUESTION 2
Refer to the exhibit.

A network administrator checks this adjacency table on a router. What is a possible cause for the incomplete marking?
A.
B.
C.
D.

incomplete ARP information
incorrect ACL
dynamic routing protocol failure
serial link congestion

Correct Answer: A
Section: Network Principles
Explanation
Explanation/Reference:
Explanation:
To display information about the Cisco Express Forwarding adjacency table or the hardware Layer 3-switching adjacency table, use the show adjacency command.
Reasons for Incomplete Adjacencies
There are two known reasons for an incomplete adjacency:
The router cannot use ARP successfully for the next-hop interface. After a clear iparp or a clear adjacency command, the router marks the adjacency as incomplete. Then it fails to clear the entry.
In an MPLS environment, IP CEF should be enabeled for Label Switching. Interface lev- el command ip route-cache cef
No ARP Entry
When CEF cannot locate a valid adjacency for a destination prefix, it punts the packets to the CPU for ARP resolution and, in turn, for completion of the adjacency.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/17812-cef- incomp.html#t4
QUESTION 3

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) A.A network engineer notices that transmission rates of senders of TCP traffic sharply increase and decrease simultaneously during periods of congestion. B. D. However. and there are no problems except that the full queue results in high latency. D. Reference: http://en. C. Which condition causes this? A. and then any new packets are simply discarded.wikipedia. the introduction of a sudden burst of traffic may cause large numbers of established.org/wiki/TCP_global_synchronization QUESTION 4 Which three problems result from application mixing of UDP and TCP streams within a network with no QoS? (Choose three. Routers on the Internet normally have packet queues. to allow them to hold packets when the network is busy. B. the size of these queues is also limited. While the network is stable. starvation jitter latency windowing lower throughput Correct Answer: ACE Section: Network Principles Explanation Explanation/Reference: Explanation: www. . steady streams to lose packets simultaneously. the queue is constantly full. The simplest technique to limit queue size is known as tail drop.com . especially when bursty traffic is present.vceplus. global synchronization tail drop random early detection queue management algorithm Correct Answer: A Section: Network Principles Explanation Explanation/Reference: Explanation: TCP global synchronization in computer networks can happen to TCP/IP flows during periods of congestion because each sender will reduce their transmission rate at the same time when packet loss occurs. until there is space in the queue again.Website designed to help IT pros advance their careers. E. C. rather than discarding them. The queue is allowed to fill to its maximum size. This causes problems when used on TCP/IP routers handling multiple TCP streams. Because routers have limited resources.

htm QUESTION 5 Which method allows IPv4 and IPv6 to work together without requiring both to be used for a single connection during the migration process? A. If both endpoints support IPv4 only. the same behavior would be observed. Even if WRED is enabled on the service provider class. then IPv4 is used. Specifically. networks. C. so it offers a very flexible coexistence strategy. and applications.com . flow control. Reference: http://www. When TCP flows are combined with UDP flows in a single service provider class and the class experiences congestion.Website designed to help IT pros advance their careers. Benefits: · Native dual stack does not require any tunneling mechanisms on internal networks · Both IPv4 and IPv6 run independent of each other · Dual stack supports gradual migration of endpoints. Tunneling is less secure than dual stack or translation. B. B. Although some UDP applications have application-level windowing. Tunneling destinations are manually determined by the IPv4 address in the low-order 32 bits of IPv4-compatible IPv6 addresses. D. This can increase latency and lower the overall throughput.vceplus.pdf QUESTION 6 Which statement about the use of tunneling to migrate to IPv6 is true? A. but it is beneficial to be aware of this behavior when making such application-mixing decisions.It is a general best practice not to mix TCP-based traffic with UDP-based traffic (especially streaming video) within a single service provider class due to the behaviors of these protocols during periods of congestion.com/web/strategy/docs/gov/IPV6at_a_glance_c45625859. C. It allows hosts to simultaneously reach IPv4 and IPv6 content. D. IPv6 is used on a dual stack endpoint. Reference: http://www. dual-stack method 6to4 tunneling GRE tunneling NAT-PT Correct Answer: A Section: Network Principles Explanation Explanation/Reference: Explanation: Dual stack means that devices are able to run IPv4 and IPv6 in parallel. Granted.cisco.cisco. then TCP flows will continually lower their rates. TCP-starvation/UDP-dominance likely occurs if (TCP-based) mission-critical data is assigned to the same service provider class as (UDP-based) streaming video and the class experiences sustained congestion. This effect is called TCP-starvation/ UDP-dominance.com/warp/public/cc/so/neso/vpn/vpnsp/spqsd_wp. Tunneling does not enable users of the new protocol to communicate with users of the old protocol without dual-stack hosts. . www. and retransmission capabilities. Tunneling is more difficult to configure than dual stack or translation. as WRED (for the most part) only affects TCP-based flows. it is not always possible to separate TCP-based flows from UDP-based flows. TCP transmitters will throttle-back flows when drops have been detected. potentially giving up their bandwidth to drop-oblivious UDP flows. For sessions that support IPv6. most UDP transmitters are completely oblivious to drops and thus never lower transmission rates due to dropping.

organizations build an overlay network that tunnels one protocol over the other by encapsulating IPv6 packets within IPv4 packets and IPv4 packets within IPv6 packets.com .cisco.com/c/en/us/products/collateral/ios-nx-os-software/ enterprise-ipv6.solution/white_paper_c11-676278. * www. Tunneling has two disadvantages.Website designed to help IT pros advance their careers. F. · Tunneling does not enable users of the new protocol to communicate with users of the old protocol without dual-stack hosts. Which two tables does this command clear and rebuild? (Choose two.) A. IP routing FIB ARP cache MAC address table Cisco Express Forwarding table topology table Correct Answer: AB Section: Network Principles Explanation Explanation/Reference: Explanation: To clear one or more entries in the IP routing table. .vceplus. thus providing connectivity between users of the new protocol. B. D. use the following commands in any mode: Command Purpose clear iproute {* | Clears one or more routes from both the unicast RIB and all the module FIBs. which negates interoperability. as discussed in RFC 6144: · Users of the new architecture cannot use the services of the underlying infrastructure. The advantage of this approach is that the new protocol can work without disturbing the old protocol. The {route | route options are as follows: prefix/length}[nexthopinterface]} · --All routes. E. C.Correct Answer: C Section: Network Principles Explanation Explanation/Reference: Explanation: Using the tunneling option.html QUESTION 7 A network administrator executes the command clear ip route. Reference: http://www.

2.vceplus. Reference: http://www. Destination addresses are stored in the high-speed cache to expedite forwarding.cisco.com .ht ml#wp1038133 www. . C. use the show ip cache EXEC command.html QUESTION 8 Which switching method is used when entries are present in the output of the command show ip cache? A.com/c/en/us/td/docs/ios/12_2/switch/command/reference/fswtch_r/xrfscmd5. route switch(config)# clear iproute · --Any IP prefix. Fast switching is enabled by default on all interfaces that support fast switching. Reference: http://www. B. Routers offer better packet-transfer performance when fast switching is enabled. prefix/length 10. To display the routing table cache used to fast switch IP traffic.2 · --The next-hop address next-hop · --The interface to reach the interface next-hop address.2. The vrf-name can be any case-sensitive.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/unicast/5_0_3_N1_1/Ci sco_n5k_layer3_ucast_cfg_rel_503_N1_1/l3_manage-routes.cisco. D. fast switching process switching Cisco Express Forwarding switching cut-through packet switching Correct Answer: A Section: Network Principles Explanation Explanation/Reference: Explanation: Fast switching allows higher throughput by switching a packet using a cache created by the initial packet sent to a particular destination. alphanumeric string up to 32 characters.Website designed to help IT pros advance their careers.[vrfvrf-name] Example: · --An individual IP route.

vceplus. C. Set window scaling to be used on the remote host. The window scaling extension in Cisco IOS software expands the definition of the TCP window to 32 bits and then uses a scale factor to carry this 32-bit value in the 16-bit window field of the TCP header.com . D.QUESTION 9 Which two actions must you perform to enable and use window scaling on a router? (Choose two. The TCP Window Scaling enhancement provides that support.) A. F. B. The TCP Window Scaling feature complies with RFC 1323.4t-book/iap-tcp.Website designed to help IT pros advance their careers. . the remote host must also support this feature and its window size must be increased. E. A larger window size is recommended to improve TCP performance in network paths with large bandwidth-delay product characteristics that are called Long Fat Networks (LFNs). Typical applications use a scale factor of 3 when deployed in LFNs. The window size can increase to a scale factor of 14. Correct Answer: AB Section: Network Principles Explanation Explanation/Reference: Explanation: The TCP Window Scaling feature adds support for the Window Scaling option in RFC 1323. header compression explicit congestion notification keepalive time stamps TCP path discovery MTU window Correct Answer: BCD Section: Network Principles Explanation www. E. Reference: http://www.cisco. The larger scalable window size will allow TCP to perform better over LFNs. Use the iptcp window-size command in global configuration mode to configure the TCP window size.) A. C. B. D. Execute the command iptcpqueuemax.html#GUID-BD998AC6F128-47DD-B5F7-B226546D4B08 QUESTION 10 Which three TCP enhancements can be used with TCP selective acknowledgments? (Choose three. In order for this to work. TCP Extensions for High Performance . Execute the command iptcp window-size 65536. Execute the command iptcp adjust-mss. Set TCP options to "enabled" on the remote host.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/12-4t/iap-12.

The receiving TCP host returns selective acknowledgment packets to the sender. Packets 4 through 8 would need to be re-sent. The sender can then resend only missing data segments (instead of everything since the first missing packet). latency starvation connectionless communication nonsequencing unordered packets jitter www. if TCP lost packets 4 and 7 out of an 8-packet window. a TCP sender could learn about only one lost packet per-round-trip time.cisco. and 8. When a TCP connection on a routing device is idle for too long. To allow TCP header compression over a serial link. C. TCP Explicit Congestion Notification The TCP Explicit Congestion Notification (ECN) feature allows an intermediate router to notify end hosts of impending network congestion. Because the time stamps are always sent and echoed in both directions and the time-stamp value in the header is always changing. and 3.Website designed to help IT pros advance their careers. Use the iptcpecn command in global configuration mode to enable TCP ECN.html#GUID-22A82C5F-631F-43909838. Use the iptcp timestamp command to enable the TCP time-stamp option. In other words.vceplus.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/xe. but such re-sent segments might have already been successfully received. The benefit of this feature is the reduction of delay and packet loss in data transmissions. E. TCP header compression will not compress the outgoing packet. TCP Time Stamp The TCP time-stamp option provides improved TCP round-trip time measurements.F2E48FFEEA01 QUESTION 11 A network administrator uses IP SLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. 5. the TCP time-stamp option is disabled. B. Only packets 4 and 7 must be re-sent. and transfer of audio and video data that are sensitive to delay or packet loss. D. the connection is considered dead and the device initiating the probes frees resources used by the TCP connection. Use the iptcp selective-ack command in global configuration mode to enable TCP selective acknowledgment. The TCP selective acknowledgment mechanism helps improve performance. the device sends a TCP keepalive packet to the peer with only the Acknowledgment (ACK) flag turned on. There is no performance impact when the feature is enabled but not used. Refer to RFC 2018 for more details about TCP selective acknowledgment. informing the sender of data that has been received. 6. Which UDP characteristic does this scenario describe? A. An aggressive sender could choose to resend packets early. Prior to selective acknowledgment.Explanation/Reference: Explanation: TCP Selective Acknowledgment The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one TCP window of data. 3. It also provides enhanced support for TCP sessions associated with applications. Prior to this feature. because of limited information available from cumulative acknowledgments. . TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window. 2. web browsing. If a response packet (a TCP ACK packet) is not received after the device sends a specific number of probes. TCP would receive acknowledgment of only packets 1. With selective acknowledgment. TCP receives acknowledgment of packets 1. TCP Keepalive Timer The TCP Keepalive Timer feature provides a mechanism to identify dead connections. the receiver can acknowledge packets received out of order. 2.3s/asr1000/iap-xe-3s-asr1000-book/iap-tcp. Reference: http://www.com . such as Telnet.

cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a0 0802d5efe. Each measurement operation can monitor against a pre-set performance threshold. D. Several SNMP traps are available: round trip time. B. Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed. and retransmission capabilities.845 UTC Thu Feb 3 2005 Latest operation return code: OK RTT Values: Number Of RTT: 10 RTT Min/Avg/Max: 1/1/1 milliseconds Latency one-way time: Number of Latency one-way Samples: 0 Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds Destination to Source Latency one way Min/Avg/Max: 0/0/0 milliseconds Reference: http://www. MOS. jitter. C. never lower transmission rates because of dropping. and connectivity tests. average jitter. one-way latency. TCP transmitters throttle back flows when drops are detected. Specifically. packet loss. flow control.vceplus. .Website designed to help IT pros advance their careers. Although some UDP applications have application-level windowing. When TCP flows are combined with UDP flows within a single service-provider class and the class experiences congestion. TCP flows continually lower their transmission rates.Correct Answer: A Section: Network Principles Explanation Explanation/Reference: Explanation: Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. This www. Here is a partial sample output from the IP SLA statistics that can be seen: router#showipsla statistics 1 Round Trip Time (RTT) for Index 55 Latest RTT: 1 ms Latest operation start time: *23:43:31. potentially giving up their bandwidth to UDP flows that are oblivious to drops.html QUESTION 12 Under which condition does UDP dominance occur? A. when TCP traffic is in the same class as UDP when UDP flows are assigned a lower priority queue when WRED is enabled when ACLs are in place to block TCP traffic Correct Answer: A Section: Network Principles Explanation Explanation/Reference: Explanation: Mixing TCP with UDP It is a general best practice to not mix TCP-based traffic with UDP-based traffic (especially Streaming-Video) within a single service-provider class because of the behaviors of these protocols during periods of congestion. most UDP transmitters are completely oblivious to drops and. thus.com .

the same behavior would be observed because WRED (for the most part) manages congestion only on TCP-based flows.vceplus.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS. B. vpdn-groupname 5. SUMMARY STEPS 1. Even if WRED is enabled on the service-provider class. Enable QoS FIFO for PPPoE support. enable 2. Restrictions This task applies only to releases prior to Cisco IOS Release 12. Execute the no switchport command. protocolpppoe DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC mode. www. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-Video and the class experiences sustained congestion. D.com . configureterminal 3.effect is called TCP starvation/UDP dominance. Reference: http://www. . vpdn enable 4. Correct Answer: B Section: Layer 2 Technologies Explanation Explanation/Reference: Explanation: Enabling PPPoE in a VPDN Group Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group. request-dialin 6. which task must be completed? A.SRND-Book/VPNQoS.2(13)T. Disable CDP on the interface.html Topic 2. · Example: Enter your password if Router> enable prompted.cisco. Layer 2 Technologies QUESTION 13 Prior to enabling PPPoE in a virtual private dialup network group.Website designed to help IT pros advance their careers. Execute the vpdn enable command. C.

Step 2 configureterminal Enters global configuration mode.cisco. PAP dot1x IPsec CHAP ESP Correct Answer: D Section: Layer 2 Technologies Explanation Explanation/Reference: www. Router(config)# vpdn enable Step 4 vpdn-groupname Associates a VPDN group with a Example: customer or VPDN profile. E. Router(config-vpdn)# requestdialin Step 6 protocol pppoe Enables the VPDN subgroup to Example: establish PPPoE Router(config-vpdn-reqin)# protocol pppoe Reference: http://www.com .com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ftpppoec_support_TSD_Island _of_Content_Chapter. can be used for authentication in this manner? A. . Which technology. Example: Router# configure terminal Step 3 vpdn enable Enables virtual private dialup Example: networking.Website designed to help IT pros advance their careers. Router(config)# vpdn-group group1 Step 5 request-dialin Creates a request-dialin VPDN Example: subgroup. C.html QUESTION 14 A network engineer has been asked to ensure that the PPPoE connection is established and authenticated using an encrypted password.vceplus. B. in combination with PPPoE. D.

the connection is still brought up and set as persistent. E.ht ml QUESTION 15 A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP. and the host name of the local router. along with the name associated with the password used in the encryption process. C. The CHAP packet requests or "challenges" the remote device to respond. authentication succeeds.cisco. D. and the random number. The benefit of using CHAP authentication is that the remote device's password is never transmitted in clear text (encrypted). the two authentication options are PAP and CHAP. B. The access server then encrypts the concatenated information with the newly retrieved password--if the result matches the result sent in the response packet. Reference: http://www. The retrieved password should be the same password the remote device used in its encryption process. The remote device sends the results back to the access server. it concatenates the ID. even if no interesting traffic exists. TCP Adjust Dialer Persistent PPPoE Groups half-bridging Peer Neighbor Route Correct Answer: B Section: Layer 2 Technologies Explanation Explanation/Reference: Explanation: A new interface configuration command. Which feature can be used to accomplish this task? A. When the remote device receives the challenge packet. the access server sends a CHAP packet to the remote device. allows a dial-on-demand routing (DDR) dialer profile connection to be brought up without being triggered by interesting traffic. Step 2 Router(config-if)# ip Specifies the IP address and mask addressaddress mask of the dialer interface as a node in the destination network to be www. The challenge packet consists of an ID. the remote device's password. a random number. use the following commands beginning in global configuration mode: Command Purpose Step 1 Router(config)# interface dialer Creates a dialer interface and number enters interface configuration mode.vceplus. it uses the name it received to retrieve a password stored in its user database. . This prevents other devices from stealing it and gaining illegal access to the ISP's network.com .Website designed to help IT pros advance their careers. If interesting traffic arrives before the timer expires. dialer persistent.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfathen. When CHAP is enabled on an interface and a remote device attempts to connect to it. and then encrypts all of it using the remote device's password. the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires. When the access server receives the response. The command provides a default timer interval. or you can set a custom timer interval. To configure a dialer interface as persistent.Explanation: With PPPoE. When configured.

even in | max-attemptsnumber] the absence of interesting traffic.cisco. hence.Assigns the dialer interface to a groupgroup-number dialer group.com . type Step 4 Router(config-if)# dialer string Specifies the remote destination dial-string class class-name to call and the map class that defines characteristics for calls to this destination. PAP authentication does not www. Step 5 Router(config-if)# dialer pool Specifies the dialing pool to use number for calls to this destination.(Optional) Specifies the name user-name authentication name of the remote router on the destination subnetwork for a dialer interface.number or by protocol and list name{permit | deny | list accessnumber to define the interesting list-number} packets that can trigger a call.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia_dia ler_persist. Step 8 Router(config-if)# dialer remote.html QUESTION 16 Which PPP authentication method sends authentication information in cleartext? A. C. Step 9 Router(config-if)# dialer Forces a dialer interface to be persistent [delay [initial] seconds connected at all times. Reference: http://www.vceplus.Website designed to help IT pros advance their careers. Step 3 Router(config-if)# encapsulation Specifies the encapsulation type. MS CHAP CDPCP CHAP PAP Correct Answer: D Section: Layer 2 Technologies Explanation Explanation/Reference: Explanation: PAP authentication involves a two-way handshake where the username and password are sent across the link in clear text.called. Step 7 Router(config-if)# dialer-list Specifies an access list by list dialer-group protocol protocol. Step 6 Router(config-if)# dialer. D. B. .

vceplus. 10 20 30 40 Correct Answer: A Section: Layer 2 Technologies Explanation Explanation/Reference: Explanation: www. C.com/c/en/us/td/docs/ios/12_2/wan/configuration/guide/fwan_c/wcffrely.cisco. Reference: http://www. the connection is terminated.com . the host sends a "challenge" message to the remote node. D. otherwise.cisco. B.html QUESTION 18 What is the default OSPF hello interval on a Frame Relay point-to-point network? A. B. Frame Relay inverse ARP static DLCI mapping Frame Relay broadcast queue dynamic DLCI mapping Correct Answer: A Section: Layer 2 Technologies Explanation Explanation/Reference: Explanation: Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a specific connection. Responses to Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server.Website designed to help IT pros advance their careers. Reference: http://www. CHAP authentication. If the values match.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10241. The host checks the response against its own calculation of the expected hash value.provide any protection against playback and line sniffing. given its known DLCI. C. the authentication is acknowledged. After the PPP link is established. the table is then used to supply the next-hop protocol address or the DLCI for outgoing traffic. . D. periodically verifies the identity of the remote node using a three-way handshake.ppp-callin-hostname.html QUESTION 17 Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection? A. The remote node responds with a value calculated using a one-way hash function. on the other hand.

PPP Session Phase--In this phase. C. called an access concentrator. B. a Session ID is assigned and the PPPoE layer is established. During this phase.cisco. D. PPP options are negotiated and authentication is performed. Active Authentication Phase and PPP Session Phase Passive Discovery Phase and PPP Session Phase Active Authorization Phase and PPP Session Phase Active Discovery Phase and PPP Session Phase Correct Answer: D Section: Layer 2 Technologies Explanation Explanation/Reference: Explanation: PPPoE is composed of two main phases: Active Discovery Phase--In this phase.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13693. .22.vceplus.html QUESTION 19 PPPoE is composed of which two phases? A. Once the link setup is completed. PPPoE functions as a Layer 2 encapsulation method.com . allowing data to be transferred over the PPP link within PPPoE headers. the PPPoE client locates a PPPoE server.Before you troubleshoot any OSPF neighbor-related issues on an NBMA network. it is important to remember that an NBMA network can be configured in these modes of operation with the ipospf network command: Point-to-Point Point-to-Multipoint Broadcast NBMA The Hello and Dead Intervals of each mode are described in this table: Hello Interval Dead Interval Network Type (secs) (secs) Point-to-Point 10 40 Point-to-Multipoint 30 120 Broadcast 10 40 Non-Broadcast 30 120 Reference: http://www.Website designed to help IT pros advance their careers.cisco.com/c/en/us/td/docs/security/asa/ www. Reference: http://www.

allowing data to be transferred over the PPP link within PPPoE headers. the PPPoE client locates a PPPoE server. PPPoE functions as a Layer 4 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers. PPPoE functions as a Layer 2 encapsulation method that allows data to be encrypted over the PPP link within PPPoE headers. PPPoE functions as a Layer 2 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers. PPP options are negotiated and authentication is performed. PPPoE functions as a Layer 2 encapsulation method. www.com/c/en/us/td/docs/security/asa/asa92/configuration/vpn/asa-vpn. . PPP options are negotiated and authentication is not performed. B.cisco.com . Once the link setup is completed. PPPoE functions as a Layer 3 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers.cli/vpn-pppoe.html Topic 3.asa92/configuration/vpn/asa-vpn. PPP Session Phase--In this phase. C.html QUESTION 20 Which statement is true about the PPP Session Phase of PPPoE? A.cli/vpn-pppoe.Website designed to help IT pros advance their careers. Reference: http://www. a Session ID is assigned and the PPPoE layer is established. D. called an access concentrator. Correct Answer: D Section: Layer 2 Technologies Explanation Explanation/Reference: Explanation: PPPoE is composed of two main phases: Active Discovery Phase--In this phase. Once the link setup is completed. Once the link setup is completed. PPP options are negotiated and authentication is performed. During this phase. Layer 3 Technologies QUESTION 21 Refer to the exhibit. Once the link setup is completed.vceplus. PPP options are automatically enabled and authorization is performed. Once the link setup is completed. PPP options are not negotiated and authentication is performed.

B.0.0. Router B will not advertise the 10.0/8 network can successfully ping users on the 192.16. Correct Answer: E Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: You can filter what individual routes are sent (out) or received (in) to any interface within your EIGRP configuration.0/8 network is missing from Router B.0/8 network will not be in the routing table on Router B.0.0. If you filter inbound.16. Users on the 10. . YOU won't know about the route and therefore won't send it to anyone else downstream.0/16 route and therefore won't send it to anyone else downstream.168. C.0/8 network will not be advertised by Router B because the network statement for the 10.0/16 network will be blocked by the ACL.0/24 network.0. D.0. the next neighbor(s) will not know about anything except the 172.0.0. Which message is required to obtain a global www. QUESTION 22 A router with an interface that is configured with ipv6 address autoconfig also has a link-local address assigned.0.0.5. but users on the 192.0. One example is noted above.5.0/24 cannot successfully ping users on the 10.0/8 network because it is blocked by the ACL.168.0.com .0.vceplus. The 10.0. If you filter outbound.0/8 network.Website designed to help IT pros advance their careers. The 10.Which one statement is true? A. Traffic from the 172. E.

2001:DB8:0:1:FFFF:C601:420F:7 C. 2001:DB8:0:1:FE80:C601:420F:7 www. The autoconfiguration on the routers stop at this stage. it has IP-connectivity to other neighbors on this link. 2001:DB8:0:1:C601:42FF:FE0F:7 B. It does this by sending a Neighbor Solicitation message with target address as the "tentative" address and destination address as the solicited-node multicast address corresponding to this tentative address. If no routers are present. Nodes (both. Before the link-local address can be assigned to the interface.google. and was asked to document the IPv6 address of the router.autoconfiguration QUESTION 23 An engineer has configured a router to use EUI-64. hosts and routers) begin the process by generating a link-local address for the interface. D. DHCPv6 request router-advertisement neighbor-solicitation redirect Correct Answer: B Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: Autoconfiguration is performed on multicast-enabled links only and begins when a multicast. If a node responds with a Neighbor Advertisement message with tentative address as the target address.enabled interface is enabled (during system startup or manually). The router has the following interface parameters: mac address C601. the address is a duplicate address and must not be used.com . The next phase involves obtaining Router Advertisements from routers if any routers are present on the link. . the Router Advertisements notify what sort of configurations the hosts need to do and the hosts receive a global unicast IPv6 address.Website designed to help IT pros advance their careers. If routers are present. C. a stateful configuration is required. Reference: https://sites. Once the node verifies that its tentative address is unique on the link. Hence. B. manual configuration is required. further tasks are performed only by the hosts.com/site/amitsciscozone/home/important-tips/ipv6/ipv6-stateless.vceplus.unicast address when a router is present? A. It is formed by appending the interface identifier to wellknown link-local prefix FE80 :: 0. At this stage. the node performs the Duplicate Address Detection mechanism to see if any other node is using the same link-local address on the link. The routers will need manual configuration (or stateful configuration) to receive site-local or global addresses. The interface identifier replaces the right-most zeroes of the link-local prefix.0007 subnet 2001:DB8:0:1::/64 Which IPv6 addresses should the engineer add to the documentation? A.420F. it assigns that link-local address to the interface.

. it maintains its original scope (global unique address is still global unique and vice versa). However. the address is globally unique.address QUESTION 24 For security purposes. The reason for inverting can be found in RFC4291 section 2. an IPv6 traffic filter was configured under various interfaces on the local router. This bit identifies whether this interface identifier is universally or locally administered. The 16bit 0xFFFE is then inserted between these two 24-bits to for the 64-bit EUI address. needs to be inverted. If 0. the address is locally administered and if 1. Therefore. Reference: https:// supportforums. The Mac address is first separated into two 24-bits. 2001:DB8:0:1:C601:42FE:800F:7 Correct Answer: A Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: Extended Unique Identifier (EUI). This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4.vceplus. Here is an example showing how the Mac Address is used to generate EUI.cisco. It is worth noticing that in the OUI portion. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address.Website designed to help IT pros advance their careers. Next. when the bit is inverted. shortly after implementing the traffic filter. the seventh bit from the left.com/document/100566/understanding-ipv6-eui-64-bit. allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64). or the universal/local (U/L) bit. What caused this issue? A. with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. the globally unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses has 1 configured.D.com .5. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the EUI-48 MAC address. www. as per RFC2373. The traffic filter is blocking all ICMPv6 traffic.1. OSPFv3 neighbor adjacencies were lost.

B. D. Reference: http://www. It sets the global BGP autonomous system number. The global anycast address must be added to the traffic filter to allow OSPFv3 to work properly.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_a1. . use the autonomous-system command in address-family configuration mode. C. IPv6 traffic filtering can be implemented only on SVIs. It sets the global EIGRP autonomous system number.Website designed to help IT pros advance their careers.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx. which caused the neighbor relationships to fail. It sets the EIGRP autonomous system number in a VRF. Correct Answer: C Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: OSPFv3 uses link-local IPv6 addresses for neighbor discovery and other features.com . use the no form of this command.htm l#wp1062796 QUESTION 26 Which type of traffic does DHCP snooping drop? A.cisco.B. To remove the autonomous-system for an EIGRP routing process from within a VPN VRF instance. discover messages www.cisco. It sets the BGP autonomous system number in a VRF. C. The link-local addresses that were used by OSPFv3 were explicitly denied. autonomous-systemautonomous-system-number no autonomous-systemautonomous-system-number Reference: http://www. D. Correct Answer: A Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: To configure the autonomous-system number for an Enhanced Interior Gateway Routing Protocol (EIGRP) routing process to run within a VPN routing and forwarding (VRF) instance.vceplus.html QUESTION 25 What is the purpose of the autonomous-system {autonomous-system-number} command? A.os/unicast/configuration/guide/l3_cli_nxos/l3_ospfv3. so if any IPv6 traffic filters are implemented be sure to include the link local address so that it is permitted in the filter list.

Website designed to help IT pros advance their careers. DHCP messages where the source MAC and client MAC do not match C.3.0.0/24 network out of FastEthernet 0/0? www.cisco. DHCP messages where the destination MAC and client MAC do not match Correct Answer: B Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: The switch validates DHCP packets received on the untrusted interfaces of VLANs with DHCP snooping enabled. or DHCPLEASEQUERY packet) from a DHCP server outside the network or firewall. you can enable the DHCP option-82 on untrusted port feature.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12. . The switch forwards the DHCP packet unless any of the following conditions occur (in which case the packet is dropped): · The switch receives a packet (such as a DHCPOFFER. DHCPACK. and the interface information in the binding table does not match the interface on which the message was received.switch ports to accept DHCP packets that include option-82 information.com . DHCPNAK.B. Which command only announces the 1.2SX/configuration/guide/book/snoodhcp.0. · The switch receives a DHCPRELEASE or DHCPDECLINE message from an untrusted host with an entry in the DHCP snooping binding table. Configure the port on the edge switch that connects to the aggregation switch as a trusted port. · The switch receives a packet on an untrusted interface. This check is performed only if the DHCP snooping MAC address verification option is turned on.2.html QUESTION 27 Refer to the exhibit. Reference: http:// www.vceplus. and the source MAC address and the DHCP client hardware address do not match. traffic from a trusted DHCP server to client D. which enables untrusted aggregation.0. · The switch receives a DHCP packet that includes a relay agent IP address that is not 0. To support trusted edge switches that are connected to untrusted aggregation-switch ports.

C. whereas access list 1 permits all 1. OSPFv3 timers were adjusted for fast convergence.9. www.0. where X is any value in the 0-255 range.8.0. the message "not a router" is found in the output.8.0. so only a /24 is both greater than or equal to 24 and less than or equal to 24. This question also asks us to apply this distribute list only to the outbound direction of the fast Ethernet 0/0 interface. 10. B. .8.0.8.0/24 network. QUESTION 29 Router A and Router B are configured with IPv6 addressing and basic routing capabilities using OSPFv3. the ge 24 term means greater than or equal to a /24 and the le 24 means less than or equal to /24.0/23 Correct Answer: B Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: With prefix lists.0/24 10. D. Only the choice of 10. allowing only 1. distribute list 1 out distribute list 1 out FastEthernet0/0 distribute list 2 out distribute list 2 out FastEthernet0/0 Correct Answer: D Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: Access list 2 is more specific. so the correct command is distribute list 2 out FastEthernet0/0. The networks that are advertised from Router A do not show up in Router B's routing table.0/16 10.24 matches this.x. This translate to any prefix in the 10.0.8.0/24.0/8 networks.0.0/16 ge 24 le 24? A.0.3. B. Why is the routing information not being learned by Router B? A. QUESTION 28 Which prefix is matched by the command ip prefix-list name permit 10.2. D.0/24 10.1.0.com .A.vceplus.Website designed to help IT pros advance their careers. After debugging IPv6 packets.8. C.

The networks were not advertised properly under the OSPFv3 process. C.B.com/c/en/us/td/docs/ios/ipv6/command/reference/ipv6_book/ipv6_16. and packet length. you see that several IPv6 addresses have the 16-bit hexadecimal value of "FFFE" inserted into the address.Number of source-routed packets.Website designed to help IT pros advance their careers. The addresses were misconfigured and will not function as intended. An IPv6 traffic filter is blocking the networks from being learned via the Router B interface that is connected to Router A. what do you conclude about these IPv6 addresses? A. Correct Answer: A Section: Layer 3 Technologies www.com . .cisco. D. IPv6 unicast routing is not enabled on Router A or Router B. IEEE EUI-64 was implemented when assigning IPv6 addresses on the device. format Errors that can result from checks performed on header fields. D. B. router Reference: http://www. C.vceplus. but IPv6 Cisco Express Forwarding was disabled. IPv6 unicast forwarding was enabled. The IPv6 universal/local flag (bit 7) was flipped. Correct Answer: D Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: show ipv6 traffic Field Descriptions Field Description source. errors the version number. not a Message sent when IPv6 unicast routing is not enabled. IPv6 addresses containing "FFFE" indicate that the address is reserved for multicast. Based on this information. routed truncated Number of truncated packets. E.html QUESTION 30 After you review the output of the command show ipv6 interface brief.

the address is globally unique. or the universal/local (U/L) bit. the address is locally administered and if 1. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the an EUI-48 MAC address. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address.Explanation Explanation/Reference: Explanation: Extended Unique Identifier (EUI). the seventh bit from the left. when the bit is inverted. Here is an example showing how a the Mac Address is used to generate EUI. . If 0.5.com . It is worth noticing that in the OUI portion. This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4. The Mac address is first separated into two 24-bits. with one being OUI (Organizationally Unique Identifier) and the other being NIC specific.Website designed to help IT pros advance their careers. The 16bit 0xFFFE is then inserted between these two 24-bits to for the 64-bit EUI address. needs to be inverted. it maintains its original scope (global unique address is still global unique and vice versa). allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64). Therefore. Next.vceplus. as per RFC2373.1. the globally unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses has 1 configured. The reason for inverting can be found in RFC4291 section 2. www. This bit identifies whether this interface identifier is universally or locally administered.

Once the above is done, we have a fully functional EUI-64 format address. Reference: https://supportforums.cisco.com/document/100566/understanding-ipv6-eui64-bit- address
QUESTION 31
A packet capture log indicates that several router solicitation messages were sent from a local host on the IPv6 segment. What is the expected acknowledgment
and its usage?
A. Router acknowledgment messages will be forwarded upstream, where the DHCP server will allocate addresses to the local host.
B. Routers on the IPv6 segment will respond with an advertisement that provides an external path from the local subnet, as well as certain data, such as prefix
discovery.
C. Duplicate Address Detection will determine if any other local host is using the same IPv6 address for communication with the IPv6 routers on the segment.
D. All local host traffic will be redirected to the router with the lowest ICMPv6 signature, which is statically defined by the network administrator.
Correct Answer: B
Section: Layer 3 Technologies
Explanation
Explanation/Reference:
Explanation:
Router Advertisements (RA) are sent in response to router solicitation messages. Router solicitation messages, which have a value of 133 in the Type field of the
ICMP packet header, are sent by hosts at system startup so that the host can immediately autoconfigure without needing to wait for the next scheduled RA
message. Given that router solicitation messages are usually sent by hosts at system startup (the host does not have a configured unicast address), the source
address in router solicitation messages is usually the unspecified IPv6 address (0:0:0:0:0:0:0:0). If the host has a configured unicast address, the unicast address of
the interface sending the router solicitation message is used as the source address in the message. The destination address in router solicitation messages is the

www.vceplus.com - Website designed to help IT pros advance their careers.

all-routers multicast address with a scope of the link. When an RA is sent in response to a router solicitation, the destination address in the RA message is the
unicast address of the source of the router solicitation message. RA messages typically include the following information:
·
One or more onlink IPv6 prefixes that nodes on the local link can use to automatically configure their IPv6 addresses
·
Lifetime information for each prefix included in the advertisement ·
Sets of flags that indicate the type of autoconfiguration (stateless or stateful) that can be completed
·
Default router information (whether the router sending the advertisement should be used as a default router and, if so, the amount of time (in seconds) the router
should be used as a default router)
·
Additional information for hosts, such as the hop limit and MTU a host should use in packets that it originates
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/ip6- addrg_bsc_con.html
QUESTION 32
You have been asked to evaluate how EIGRP is functioning in a customer network.

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www.vceplus.com - Website designed to help IT pros advance their careers.

www.Website designed to help IT pros advance their careers. .vceplus.com .

www.vceplus.Website designed to help IT pros advance their careers. .com .

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com .www.vceplus. .Website designed to help IT pros advance their careers.

.www.com .vceplus.Website designed to help IT pros advance their careers.

R5-R6 paths.Traffic from R1 to R61 s Loopback address is load shared between R1-R2-R4-R6 and R1-R3. 1:1 1:5 6:8 19:80 www.Website designed to help IT pros advance their careers. C. . What is the ratio of traffic over each path? A. D. B.vceplus.com .

Website designed to help IT pros advance their careers.com .vceplus.Correct Answer: D Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: First. . find the IP address of the loopback0 interface on R6: www.

vceplus.com . .Website designed to help IT pros advance their careers.www.

6 command from R1 and see this: Notice the traffic share count shows 19 for the first path.6. so we issue the show ip route 150.1.6.com .vceplus. QUESTION 33 You have been asked to evaluate how EIGRP is functioning in a customer network. and 80 for the second path.6.1. www. .Website designed to help IT pros advance their careers.We see that it is 150.

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.com .Website designed to help IT pros advance their careers.vceplus.www.

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vceplus.Website designed to help IT pros advance their careers. .www.com .

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com .www. .Website designed to help IT pros advance their careers.vceplus.

com .www. .vceplus.Website designed to help IT pros advance their careers.

.What type of route filtering is occurring on R6 A.Website designed to help IT pros advance their careers.vceplus. C. Distribute-list using an ACL Distribute-list using a prefix-list Distribute-list using a route-map An ACL using a distance of 255 www.com . D. B.

vceplus. .com .Website designed to help IT pros advance their careers.Correct Answer: A Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: The configuration on R6 is as follows: www.

Website designed to help IT pros advance their careers.This is a standard distribute list using access list number 1.com . . www.vceplus.

QUESTION 34 You have been asked to evaluate how EIGRP is functioning in a customer network.com .vceplus. www. .Website designed to help IT pros advance their careers.

vceplus.Website designed to help IT pros advance their careers.www.com . .

com .vceplus. .Website designed to help IT pros advance their careers.www.

.vceplus.www.com .Website designed to help IT pros advance their careers.

www.vceplus.com - Website designed to help IT pros advance their careers.

www.vceplus.com - Website designed to help IT pros advance their careers.

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CISCO EIGRP key MD5 www. D.Which key chain is being used for authentication of EIGRP adjacency between R4 and R2? A. .com . C. B.vceplus.Website designed to help IT pros advance their careers.

vceplus. .Website designed to help IT pros advance their careers.com .Correct Answer: A Section: Layer 3 Technologies Explanation Explanation/Reference: R4 and R2 configs are as shown below: www.

www. .Website designed to help IT pros advance their careers.vceplus.com .

www. . QUESTION 35 You have been asked to evaluate how EIGRP is functioning in a customer network.Clearly we see the actual key chain is named CISCO.com .vceplus.Website designed to help IT pros advance their careers.

www.Website designed to help IT pros advance their careers. .com .vceplus.

Website designed to help IT pros advance their careers.com .vceplus. .www.

vceplus.com . .Website designed to help IT pros advance their careers.www.

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com .vceplus.www. .Website designed to help IT pros advance their careers.

.vceplus.Website designed to help IT pros advance their careers.com .www.

B. C. .com .46.Website designed to help IT pros advance their careers. D.vceplus. 333056 1938688 1810944 307456 www.What is the advertised distance for the 192.0 network on R1? A.168.

com .Website designed to help IT pros advance their careers. .Correct Answer: C Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: R1`s routing table is as follows www.vceplus.

www.Website designed to help IT pros advance their careers.com . .vceplus.

0 route. www. QUESTION 36 You have been asked to evaluate how EIGRP is functioning in a customer network.168.com .vceplus.46. .Website designed to help IT pros advance their careers. which is shows as 1810944 for the 192.The numbers after the route specify the administrative distance of the route (90 for EIGRP) and the distance metric of that particular route.

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com .Website designed to help IT pros advance their careers.www.vceplus. .

.com .Website designed to help IT pros advance their careers.vceplus.www.

com .Website designed to help IT pros advance their careers. .www.vceplus.

www.com .Website designed to help IT pros advance their careers. .vceplus.

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C.com . . D.vceplus. B.What percent of R1`s interfaces bandwidth is EIGRP allowed to use? A.Website designed to help IT pros advance their careers. 10 20 30 40 www.

vceplus. .com .Correct Answer: B Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: The relevant configuration of R1 is shown below: www.Website designed to help IT pros advance their careers.

com .www.Website designed to help IT pros advance their careers.vceplus. .

com . www. The customer has disabled your access to the show running.config command.vceplus. .ip bandwidth-percent eigrp 1 20 1 = the EIGRP AS 20 = 20% of the bandwidth QUESTION 37 Scenario: You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation.Website designed to help IT pros advance their careers.

www.Website designed to help IT pros advance their careers. .com .vceplus.

com .vceplus. .Website designed to help IT pros advance their careers.www.

com .www.vceplus. .Website designed to help IT pros advance their careers.

www.com .vceplus.Website designed to help IT pros advance their careers. .

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vceplus. .Website designed to help IT pros advance their careers.www.com .

How old is the Type 4 LSA from Router 3 for area 1 on the router R5 based on the output you have examined? A.com . 1858 1601 600 1569 www. C.Website designed to help IT pros advance their careers. . B. D.vceplus.

3.vceplus.3) shows the age is 1858.config command. QUESTION 38 Scenario: You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation. . www.com . The customer has disabled your access to the show running.Correct Answer: A Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: Part of the show ipospf topology command on R5 shows this: The Link ID of R3 (3.3.Website designed to help IT pros advance their careers.

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.vceplus.com .www.Website designed to help IT pros advance their careers.

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com .www.vceplus.Website designed to help IT pros advance their careers. .

.Website designed to help IT pros advance their careers.vceplus.www.com .

Which of the following statements is true about the serial links that terminate in R3 A. The R1-R3 link needs the neighbor command for the adjacency to stay up The R2-R3 link OSPF timer values are 30.40.vceplus. www.Website designed to help IT pros advance their careers. . 120 The R1-R3 link OSPF timer values should be 10. B.com . D.40 R3 is responsible for flooding LSUs to all the routers on the network. 120. C.

vceplus.Website designed to help IT pros advance their careers. .com .Correct Answer: B Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: We can see the configured timers using the following command: www.

Website designed to help IT pros advance their careers.www.vceplus. .com .

. The customer has disabled your access to the show running.vceplus.config command.Website designed to help IT pros advance their careers.com .QUESTION 39 Scenario: You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation. www.

com .Website designed to help IT pros advance their careers.www. .vceplus.

.vceplus.Website designed to help IT pros advance their careers.com .www.

com .vceplus.Website designed to help IT pros advance their careers. .www.

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Website designed to help IT pros advance their careers.vceplus. .www.com .

.Website designed to help IT pros advance their careers. B.com . 1 5 9 20 54 www. E.vceplus. D.How many times was SPF algorithm executed on R4 for Area 1? A. C.

vceplus.com .Website designed to help IT pros advance their careers. Look for the Area 1 stats which shows this: www.F. . 224 Correct Answer: C Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: This can be found using the show ipospf command on R4.

.vceplus.com .config command. The customer has disabled your access to the show running.Website designed to help IT pros advance their careers. www.QUESTION 40 Scenario: You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation.

vceplus. .com .www.Website designed to help IT pros advance their careers.

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www.Website designed to help IT pros advance their careers.vceplus.com . .

com .vceplus.www.Website designed to help IT pros advance their careers. .

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vceplus. .www.Website designed to help IT pros advance their careers.com .

. B. E. D.Areas of Router 5 and 6 are not normal areas. inspect their routing tables and determine which statement is true? A. R5's Loopback and R6's Loopback are both present in R5's Routing table R5's Loopback and R6's Loopback are both present in R6's Routing table Only R5's loopback is present in R5's Routing table Only R6's loopback is present in R5's Routing table Only R5's loopback is present in R6's Routing table www.Website designed to help IT pros advance their careers.com . C.vceplus.

Website designed to help IT pros advance their careers.Correct Answer: A Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: Here are the routing tables of R5 and R6: www. .com .vceplus.

www.vceplus.com - Website designed to help IT pros advance their careers.

www.vceplus.com - Website designed to help IT pros advance their careers.

www.vceplus.com - Website designed to help IT pros advance their careers.

Topic 4.255.200. interface fa0/0 bandwidth 1536 ip address 209.231 255.230 255. tunnel interfaces by default are point-to-point (p-p) using GRE encapsulation.224 tunnel source 209. .255. interface Tunnel0 bandwidth 1536 ip address 209. Note.224 tunnel source Serial0/0 tunnel mode gre multipoint B.201.224 tunnel source 192. effectively they have the tunnel mode gre command. www.224 tunnel mode gre multipoint C.255.x found with p2p GRE tunnels.168.255. Which interface configuration output can be applied to the corporate router to allow communication to the remote sites? A.200.1 tunnel-mode dynamic D. which is not seen in the configuration because it is the default.2 tunnel destination 209. interface fa 0/0 bandwidth 1536 ip address 209.165. Conversely.255.1 tunnel-mode dynamic Correct Answer: A Section: VPN Technologies Explanation Explanation/Reference: Explanation: The configuration of mGRE allows a tunnel to have multiple destinations.231 255. interface Tunnel0 bandwidth 1536 ip address 209.Website designed to help IT pros advance their careers. An mGRE interface does not have a configured destination.165.165.200. an mGRE tunnel requires NHRP to resolve the tunnel endpoints.165.201.161. VPN Technologies QUESTION 41 A company has just opened two remote branch offices that need to be connected to the corporate network. This means that an mGRE tunnel on the hub may connect to a p2p tunnel on the branch.165.x. The distinguishing feature between an mGRE interface and a p2p GRE interface is the tunnel destination.255.165.255.230 255. a p2p GRE tunnel may connect to an mGRE tunnel. Besides allowing for multiple destinations. This command is used instead of the tunnel destination x.com .vceplus.255. Instead the GRE tunnel is configured with the command tunnel mode gre multipoint.200.x. The configuration of mGRE on one side of a tunnel does not have any relation to the tunnel properties that might exist at the exit points.

1.255. inbound crypto map remaining key lifetime path MTU tagged packets untagged packets invalid identity packets Correct Answer: ABC Section: VPN Technologies Explanation Explanation/Reference: Explanation: show crypto ipsecsa This command shows IPsec SAs built between peers. failed: 0.255.1.0 tunnel source Serial0/0 tunnel mode gre multipoint Reference: http://www.1. #pkts decompressed: 0 #pkts not compressed: 0. local addr.1 local ident (addr/mask/prot/port): (20. #send errors 1.1. flags={origin_is_acl.1.255.html QUESTION 42 A network engineer executes the show crypto ipsecsa command. interface: FastEthernet0 Crypto map tag: test.1.1.0/255.62. B.1.0 and 10.: 12.: 12. You can see the two Encapsulating Security Payload (ESP) SAs built inbound and outbound.cisco.1. #pkts digest 7767918 #pktsdecaps: 7760382.1.vceplus. Which three pieces of information are displayed in the output? (Choose three.1.2 PERMIT. F.com .) A.1.1.} #pktsencaps: 7767918.Website designed to help IT pros advance their careers.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/DMVPDG/DMVP N_2_Phase2. #pkts verify 7760382 #pkts compressed: 0. #pktscompr. E. #recv errors 0 local crypto endpt.1.1.1. C. The encrypted tunnel is built between 12. D.0/0/0) remoteident (addr/mask/prot/port): (10.2 for traffic that goes between networks 20.1. media mtu 1500 current outbound spi: 3D3 inboundespsas: www. 12.1 and 12.0/0/0) current_peer: 12.255. #pkts encrypt: 7767918. remote crypto endpt. Authentication Header (AH) is not used since there are no AH SAs.1.1. #pkts decompress failed: 0.255.1.The mGRE configuration is as follows: ! interface Tunnel0 bandwidth 1536 ip address 10.1.10 255.2 pathmtu 1500. This output shows an example of the show crypto ipsecsa command (bolded ones found in answers for this question).1.0/255. #pkts decrypt: 7760382.0. .255.

spi: 0x136A010F(325714191) transform: esp-3des esp-md5-hmac . The NHRP mapping entry cannot be overwritten. crypto map: test sa timing: remaining key lifetime (k/sec): (4608000/52) IV size: 8 bytes replay detection support: Y outboundahsas: outboundpcpsas: Reference: http://www.1.1. expire 01:59:47 TypE. NHRP mapping is for networks that are local to this router.2/8 via 10.2. conn id: 3442. Correct Answer: A Section: VPN Technologies Explanation Explanation/Reference: Explanation: Show NHRP: Examples The following is sample output from the show ipnhrp command: Router# show ipnhrp www. } slot: 0. in use settings ={Tunnel. Flags: authoritative unique nat registered used NBMA address: 10.12. D. Data packets are process switches for this mapping entry.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike. .cisco.vceplus. crypto map: test sa timing: remaining key lifetime (k/sec): (4608000/52) IV size: 8 bytes replay detection support: Y inboundahsas: inboundpcpsas: inboundpcpsas: outboundespsas: spi: 0x3D3(979) transform: esp-3des esp-md5-hmac .2 What does the authoritative flag mean in regards to the NHRP information? A.1. } slot: 0.html QUESTION 43 Refer to the following output: Router#showipnhrp detail 10.2. E. It was obtained directly from the next-hop server. B. C. flow_id: 1444. Tunnel1 created 00:00:12. The mapping entry was created in response to an NHRP registration request.Website designed to help IT pros advance their careers. flow_id: 1443.protocols/5409-ipsec-debug-00.dynamic. in use settings ={Tunnel.1.com . conn id: 3443.

The mask is always 255.1111.0.255. static--NBMA address was statically configured. B.1111.1.Website designed to help IT pros advance their careers.1111. · The interface type and number and how long ago it was created (hours:minutes:seconds). · Flags: authoritative--Indicates that the NHRP information was obtained from the Next Hop Server or router that maintains the NBMA-to-IP address mapping for a particular destination.255.11 10.1111.1111. .1111.255 because Cisco does not support aggregation of NBMA information through NHRP.1.0.2 255.cisco.255.com .255.2 The fields in the sample display are as follows: · The IP address and its network mask in the IP-to-NBMA address cache.0. · Type of interface: dynamic--NBMA address was obtained from the NHRP Request packet.255.255.255. D. This value is based on the ipnhrpholdtime command.10.vceplus. C.html QUESTION 44 Which common issue causes intermittent DMVPN tunnel flaps? A.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp. · The time in which the positive and negative authoritative NBMA address will expire (hours:minutes:seconds). Reference: http://www. Tunnel0 created 0:10:03 expire 1:49:56 Type: static Flags: authoritative NBMA address: 10.1111. Solution www.0. a routing neighbor reachability issue a suboptimal routing table interface bandwidth congestion that the GRE tunnel to hub router is not encrypted Correct Answer: A Section: VPN Technologies Explanation Explanation/Reference: Explanation: DMVPN Tunnel Flaps Intermittently Problem DMVPN tunnel flaps intermittently.1111.1 255.1111. tunnel 100 created 0:00:43 expire 1:59:16 Type: dynamic Flags: authoritative NBMA address: 10.255.

com/c/en/us/td/docs/ios-xml/ios/evn/configuration/xe-3s/evn-xe-3s. check the neighborship between the routers as issues with neighborship formation between routers may cause the DMVPN tunnel to flap. 802.Website designed to help IT pros advance their careers. F. and port channels.vceplus. Reference: http://www. C.cisco. IP address routing table forwarding table access control lists NetFlow configuration Correct Answer: ABC Section: VPN Technologies Explanation www. D.cisco. you cannot configure VRF-Lite on the same interface.pdf QUESTION 46 Which three characteristics are shared by subinterfaces and associated EVNs? (Choose three. . · If an EVN trunk is configured on an interface. OSPFv2 is supported. C. B.protocols/29240-dcmvpn. · OSPFv3 is not supported. Gigabit Ethernet. such as Fast Ethernet. · A single IP infrastructure can be virtualized to provide up to 32 virtual networks end-to-end.) A. D. In order to resolve this problem. E.com/c/en/us/support/docs/securityvpn/ipsec-negotiation-ike.book/evn-overview. Reference: http://www. E.com .1q encapsulation. B. make sure the neighborship between the routers is always up.When DMVPN tunnels flap.1Q ISL PPP Frame Relay MPLS HDLC Correct Answer: A Section: VPN Technologies Explanation Explanation/Reference: Explanation: Restrictions for EVN · An EVN trunk is allowed on any interface that supports 802.html#Prblm1 QUESTION 45 Which encapsulation supports an interface that is configured for an EVN trunk? A.

B.com/en/US/docs/iosxml/ios/evn/configuration/xe-3sg/evn. establishes a secure SSL connection and either remains or uninstalls itself (depending on the security appliance configuration) when the connection terminates. users must enter the URL in the form https://<address>. D.cisco. .cisco. Which type of remote access did the engineer enable? A. Reference: http://www.overview. After doing this. D. and follow the instructions.pdf QUESTION 47 A user is having issues accessing file shares on a network.html QUESTION 48 Which Cisco IOS VPN technology leverages IPsec. This is accomplished as a result of each EVN having a unique routing and forwarding table. the trunk interface is identified by the same IP address in different EVN contexts. In other words.generation-firewalls/100936-asa8x-split-tunnel-anyconnect-config. the client installs and configures itself. remote users enter the IP address in their browser of an interface configured to accept SSL VPN connections. Without a previously installed client. dynamic routing protocol. B. Unless the security appliance is configured to redirect http:// requests to https://. it downloads the client that matches the operating system of the remote computer. After downloading. the browser connects to that interface and displays the login screen. thereby enabling support for overlapping IP addresses across multiple EVNs. C. and Cisco Express Forwarding? A. the user is able to access company shares. input a prescribed IP address.Website designed to help IT pros advance their careers. If the user satisfies the login and authentication.com/c/en/us/support/docs/security/asa-5500-x-series-next. NHRP. EZVPN IPsec VPN client access VPDN client access SSL VPN client access Correct Answer: D Section: VPN Technologies Explanation Explanation/Reference: Explanation: The Cisco AnyConnect VPN Client provides secure SSL connections to the security appliance for remote users. mGRE.vceplus. Reference: http://www.Explanation/Reference: Explanation: A trunk interface can carry traffic for multiple EVNs. and the security appliance identifies the user as requiring the client. After entering the URL. all the subinterfaces and associated EVNs have the same IP address assigned. To simplify the configuration process. C. FlexVPN DMVPN GETVPN Cisco Easy VPN www. The network engineer advises the user to open a web browser.com .

DMVPN is initially configured to build out a hub-and-spoke network by statically configuring the hubs (VPN headends) on the spokes. . OSPF. including IPsec (Internet Protocol Security) and ISAKMP (Internet Security Association and Key Management Protocol) peers. DMVPN is combination of the following technologies: Multipoint GRE (mGRE) Next-Hop Resolution Protocol (NHRP) Dynamic Routing Protocol (EIGRP. Using this initial hub-and-spoke network. RIP. B. This DMVPN provides the capability for creating a dynamic-mesh VPN network without having to pre-configure (static) all possible tunnel end-point peers. NHRP and IPsec. This dynamic-mesh capability alleviates the need for any load on the hub to route data between the spoke networks.Website designed to help IT pros advance their careers. GRE. tunnels between spokes can be dynamically built on demand (dynamic-mesh) without additional configuration on the hubs or spokes.wikipedia.Correct Answer: B Section: VPN Technologies Explanation Explanation/Reference: Explanation: Dynamic Multipoint Virtual Private Network (DMVPN) is a dynamic tunneling form of a virtual private network (VPN) supported on Cisco IOS-based routers and Unix-like Operating Systems based on the standard protocols. D. IPv6 access list has just one entry. all traffic to vty 0 4 from source 2001:DB8:0:4::32 only ssh traffic to vty 0 4 from source all only ssh traffic to vty 0 4 from source 2001:DB8:0:4::32 all traffic to vty 0 4 from source all Correct Answer: C Section: Infrastructure Security Explanation Explanation/Reference: Explanation: Here we see that the IPv6 access list called cisco is being applied to incoming VTY connections to the router. which allows only www.com . no change in the configuration on the hub is required to accept new spokes.vceplus. BGP) Dynamic IPsec encryption Cisco Express Forwarding (CEF) Reference: http://en.org/wiki/Dynamic_Multipoint_Virtual_Private_Network Topic 5. Infrastructure Security QUESTION 49 Which traffic does the following configuration allow? ipv6 access-list cisco permit ipv6 host 2001:DB8:0:4::32 any eqssh linevty 0 4 ipv6 access-class cisco in A. C.

com . QUESTION 50 For troubleshooting purposes.dmvpn/111976-dmvpn-troubleshoot-00. This command should be used with caution in production networks. . E. You can use the KRON scheduler. D.the single IPv6 IP address of 2001:DB8:0:4::32 to connect using SSH only. You can use an IOS parser. Always use with the access-list command to apply an extended ACL to the debug output. Reference: http://www. You can use the RITE traffic exporter. A packet that matches access-list with the "log" keyword is fast switched. B.vceplus. A packet that matches access-list with the "log" keyword is Cisco Express Forwarding switched. the network engineer notices that the router CPU utilization has risen to 99 percent.cisco. What is the reason for this? A. You can use an extended access list. Correct Answer: C Section: Infrastructure Security Explanation Explanation/Reference: Explanation: The debug ip packet command generates a substantial amount of output and uses a substantial amount of system resources.Website designed to help IT pros advance their careers. A large amount of IP traffic is being permitted on the router. C. A packet that matches access-list with the "log" keyword is process switched. access-list 100 permit ip any any log After applying the access list on a Cisco router.html QUESTION 51 Refer to the following access list. Correct Answer: C Section: Infrastructure Security Explanation Explanation/Reference: Explanation: www. D. C. You can disable the IP route cache globally. B. which method can you use in combination with the debug ip packet command to limit the amount of output data? A.com/c/en/us/ support/docs/security/dynamic-multipoint-vpn.

ACL logging can be CPU intensive and can negatively affect other functions of the network device.com . Unicast RPF deflects such attacks by forwarding only packets that have source addresses that are valid and consistent with the IP routing table.cisco. broadcast mode. and broadcast mode strict mode. can take advantage of forged or rapidly changing source IP addresses to allow attackers to thwart efforts to locate or filter the attacks.html#4 QUESTION 52 Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet against the routing table? A.Logging-enabled access control lists (ACLs) provide insight into traffic as it traverses the network or is dropped by network devices.com/en/US/docs/ios/12_2/security/configuration/guide/scfrpf. C.cisco. and VRF mode Correct Answer: A Section: Infrastructure Security Explanation Explanation/Reference: Explanation: www. and VRF mode strict mode. Unfortunately. C. There are two primary factors that contribute to the CPU load increase from ACL logging: process switching of packets that match log-enabled access control entries (ACEs) and the generation and transmission of log messages.com/web/about/security/intelligence/acl-logging.vceplus. strict mode.Website designed to help IT pros advance their careers. B. D. loose mode. . loose mode.html QUESTION 53 What are the three modes of Unicast Reverse Path Forwarding? A. and VRF mode broadcast mode. a number of common types of denial-of-service (DoS) attacks. For example. and the rest of the Internet. This action protects the network of the ISP. source address destination address router interface default gateway Correct Answer: A Section: Infrastructure Security Explanation Explanation/Reference: Explanation: The Unicast RPF feature helps to mitigate problems that are caused by the introduction of malformed or forged (spoofed) IP source addresses into a network by discarding IP packets that lack a verifiable IP source address. loose mode. B. its customer. D. For Internet service providers (ISPs) that provide public access. Reference: http://www. Reference: http://www. including Smurf and Tribal Flood Network (TFN).

0.10. When administrators use Unicast RPF in strict mode.0. Although asymmetric traffic flows may be of concern when deploying this feature.255.255.255.168.172. Unicast RPF in VRF mode will not be covered in this document. accomplish? router(config)#access-list 101 deny ip 10. Care must be taken to ensure that the appropriate Unicast RPF mode (loose or strict) is configured during the deployment of this feature because it can drop legitimate traffic.0.Website designed to help IT pros advance their careers.com . Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network. This ACL is used to prevent all packets with a spoofed reserved private source IP address to enter the www. D.168. Correct Answer: C Section: Infrastructure Security Explanation Explanation/Reference: Explanation: The private IP address ranges defined in RFC 1918 are as follows: 10.168.255. An access list may also be specified that permits or denies certain source addresses in Unicast RPF loose mode. If the source IP address is not valid.com/web/about/security/intelligence/unicast-rpf.0. C. which is applied on the external interface FastEthernet 1/0 of the perimeter router.255. It prevents the internal network from being used in spoofed denial of service attacks and logs any exit to the Internet.255.vceplus.cisco. Administrators can change this behavior using the allow-default option.html QUESTION 54 What does the following access list.0 0.172.192. . 172.0. This capability can limit the appearance of spoofed addresses on a network.0 . B.0.168.0 0. When administrators use Unicast RPF in loose mode.0. the source address must appear in the routing table.255. Unicast RPF loose mode is a scalable option for networks that contain asymmetric routing paths.0.255 192.0-192.0.0.0.31.255 and logs any intrusion attempts.31.0-10.0 .15.0.255. Additionally.168.255.255.255 172. the packet must be received on the interface that the router would use to forward the return packet. It filters incoming traffic from private addresses in order to prevent spoofing and logs any intrusion attempts. loose mode.16.0.16. It prevents private internal addresses to be accessed directly from outside. Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic.255 any log router (config)#access-list 101 deny ip 192.255 any log router (config) #access-list 101 deny ip 172.0 . or VRF mode.255. This security feature works by enabling a router to verify the reachability of the source address in packets being forwarded. Note that not all network devices support all three modes of operation.255 These IP addresses should never be allowed from external networks into a corporate network as they would only be able to reach the network from the outside via routing problems or if the IP addresses were spoofed. It prevents incoming traffic from IP address ranges 10. Reference: http://www.255.0 0.0.255 any log router (config)#access-list 101 permit ip any any router (config)#interface fastEthernet 1/0 router (config-if)#ip access-group 101 in A.0. Unicast RPF works in one of three different modes: strict mode. a packet that contains a source address for which the return route points to the Null 0 interface will be dropped.16.0. 192.Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit the malicious traffic on an enterprise network. which allows the use of the default route in the source verification process. the packet is discarded.

225 router(config-if)#udp helper-address 172. The router will never accept any HTTP and HTTPS traffic. C.225 router(config-if)#ipudp helper-address 172.20. C.html#wp3612805529 QUESTION 56 A network engineer is configuring a routed interface to forward broadcasts of UDP 69. To return the HTTPS server port number to the default.14. D.225. . use the no form of this command. but the port number must be number higher than 1024 unless the default is used.network.com/en/US/docs/ios-xml/ios/https/command/nm-https-cr-cl. The router will listen on port 4433 for HTTPS traffic.20. B.vceplus. QUESTION 55 Refer to the following command: router(config)# ip http secure-port 4433 Which statement is true? A.225 69 53 49 Correct Answer: A Section: Infrastructure Security www.com . use the ip http secure-port command in global configuration mode. 53.14. and 49 to 172.225 router(config-if)#ip helper-address 172. The log keyword also enables logging of this intrusion attempt. Which command should be applied to the configuration to allow this? A. D. The default is 443. router(config-if)#ip helper-address 172. iphttpsecure-portport-number noiphttpsecure-port Syntax Description port. Reference: http://www. The router will listen on port 4433 for HTTP traffic. Correct Answer: A Section: Infrastructure Security Explanation Explanation/Reference: Explanation: To set the secure HTTP (HTTPS) server port number for listening.20.14.Website designed to help IT pros advance their careers.sh.Integer in the range of 0 to 65535 is accepted.20. The router will listen to HTTP and HTTP traffic on port 4433.cisco.14. B.14.20.

there are some major changes under the hood.28 informs version 3 auth CISCORO Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: Most network admins and engineers are familiar with SNMPv2c which has become the dominant SNMP version of the past decade. Finally.port 67 · TACACS UDP port 49 Reference: http://www.com .Website designed to help IT pros advance their careers.vceplus. Which command satisfies the requirements of this scenario? A.com/163/forward_udp_broadcas. Most companies have decided that the information being transmitted isn`t valuable enough to be worth the extra effort in upgrading to SNMPv3.cisco-faq.html Topic 6. The problem of course is that the SNMP statistical payload is not encrypted and authentication is passed in cleartext.16. B. the following broadcast packets will be forwarded by the router by default: · TFTP .based authentication and view-based access control. Infrastructure Services QUESTION 57 A network engineer is configuring SNMP on network devices to utilize one-way SNMP notifications.28 informs version 2c CISCORO router(config)#snmp-server host 172. ip helper-address {ip address} When configuring the ip helper-address command. SNMP version 2 uses community strings (think cleartext passwords. C.28 traps version 2c CISCORO router(config)#snmp-server host 172. The users are not actual local user accounts.201.com/snmp-version-3/ www.port 137 · NetBIOS Datagram Server .port 37 · NetBIOS Name Server .Explanation Explanation/Reference: Explanation: To let a router forward broadcast packet the command ip helper-address can be used. Reference: http://www. the engineer is not concerned with authentication or encryption.201. views.16.port 138 · Bootstrap Protocol (BOOTP) . The view is used to define what the user account may access on the IOS device. groups.ccnpguide.201.28 traps version 3 auth CISCORO router(config)#snmp-server host 172. each user is added to a group. . Users. but I would suggest otherwise.UDP port 69 · Domain Name System (DNS) UDP port 53 · Time service . However. no encryption) to authenticate polling and trap delivery. D. rather they are simply a means to determine who can authenticate to the device. It`s simple to configure on both the router/switch-side and just as easy on the network monitoring server. Like IPv4 to IPv6. which determines the access policy for its users. router(config)#snmp-server host 172.201.16. SNMP version 3 moves away from the community string approach in favor of user.16. The broadcasts will be forwarded to the unicast address which is specified with the ip helper command.

username password community-string encryption-key Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: The following security models exist: SNMPv1. Disable event logging on all noncritical items. The SNMPv3 implementations could be configured to use either of the models on per-group basis (in case if noAuthNoPriv is configured.QUESTION 58 When using SNMPv3 with NoAuthNoPriv. username serves as a replacement for community string).ine. B. senior management asks you to implement better logging functionality on all IOS-based devices. C.com . Correct Answer: AB Section: Infrastructure Services Explanation Explanation/Reference: Explanation: www. Increase the logging history . E.com/2008/07/19/snmpv3-tutorial/ QUESTION 59 After a recent DoS attack on a network.Website designed to help IT pros advance their careers. Set the logging severity level to 1. SNMPv1 and SNMPv2 models only support the noAuthNoPriv model since they use plain community string to match the incoming packets. Reference: http://blog. Use the msec option to enable service time stamps. . Which two actions can you take to provide enhanced logging results? (Choose two.) A.vceplus. B. C. SNMPv2. D. AuthPriv (messages are authenticated and encrypted priv keyword in CLI). D. AuthNoPriv (messages are authenticated but not encrypted auth keyword in CLI). The following security levels exits: noAuthNoPriv (no authentiation and no encryption noauth keyword in CLI). Specify a logging rate limit. which string is matched for authentication? A. SNMPv3.

B. In this situation. D. Core dumps are generally very useful to your technical support representative. which feature can the engineer use to create a crash collection? A. C. it is sometimes useful to obtain a full copy of the memory image (called a core dump) to identify the cause of the crash. secure copy protocol core dumps warm reloads SNMP NetFlow Correct Answer: B Section: Infrastructure Services Explanation Explanation/Reference: Explanation: When a router crashes. It enables receiving NTP broadcasts on all interfaces globally. "saving level warnings or higher. and SNMP messages will be sent by the less sever (5-7) messages. more granular monitoring can occur. Four basic ways exist for setting up the router to generate a core dump: · Using Trivial File Transfer Protocol (TFTP) · Using File Transfer Protocol (FTP) · Using remote copy protocol (rcp) · Using a Flash disk Reference: http://www.cisco. To limit syslog messages sent to the router's history table and to an SNMP network management station based on severity. what is the result of the command? A.com . QUESTION 60 A network engineer finds that a core router has crashed without warning. This can aid in pinpointing the exact time of events. E. www. in other words.Website designed to help IT pros advance their careers. Assuming that an NTP server is already set up. critical. and warning levels). By default. or to correlate the order that the events happened. alert. Cisco devices Log error messages of severity levels 0 through 4 (emergency.The optional msec keyword specifies the date/time format should include milliseconds.com/en/US/docs/internetworking/troubleshooting/guide/tr19aa. error.vceplus. use the logging history command in global configuration mode.html QUESTION 61 A network engineer is trying to implement broadcast-based NTP in a network and executes the ntp broadcast client command. It enables receiving NTP broadcasts on the interface where the command was executed." By increasing the severity level. B. .

D. It maintains a per-node state. .com . When you use the ntp broadcast client command. To avoid as many of the issues associated with NAPT44 as possible. the NTP service is activated (if it has not already been activated) and the device is configured to receive NTP broadcast packets on a specified interface simultaneously. designed to provide address independence to the edge network. C. It enables a device to be an NTP peer to another device. It is transport-agnostic with respect to transports that do not checksum the IP header.com/c/en/us/td/docs/ios-xml/ios/bsm/command/bsm-xe-3se-3850. D. Command Description ntp broadcast Allows the system to receive NTP broadcast packets on an client interface. algorithmic translation function. It interferes with encryption of the full IP payload.cr-book/bsm-xe-3se-3850-cr-book_chapter_00.org/html/rfc6296 QUESTION 63 www.html QUESTION 62 What is a function of NPTv6? A.ietf.Website designed to help IT pros advance their careers. It rewrites transport layer headers. Reference: http://www. B. It is checksum-neutral.C. and nothing else.cisco. It enables a device to receive NTP broadcast and unicast packets. and to transports that use the TCP/UDP/DCCP (Datagram Congestion Control Protocol) pseudo-header and checksum NPTv6 provides a simple and compelling solution to meet the address-independence requirement in IPv6.vceplus. such as SCTP. checksum-neutral. Correct Answer: C Section: Infrastructure Services Explanation Explanation/Reference: Explanation: RFC 6296 describes a stateless IPv6-to-IPv6 Network Prefix Translation (NPTv6) function. Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: The NTP service can be activated by entering any ntp command. NPTv6 is defined to include a two-way. The address-independence benefit stems directly from the translation function of the network prefix translator. Reference: http://tools.

C.com . The operation is scheduled to start immediately. The NAT64 server then creates a NAT-mapping between the IPv6 and the IPv4 address. and sends its packets to the resulting address. RFC 6146).org/wiki/NAT64 QUESTION 64 A network engineer initiates the ipsla responder tcp-connect command in order to gather statistics for performance gauging. The IPv6 client embeds the IPv4 address it wishes to communicate with using these bits. allowing them to communicate. . NAT NATng NAT64 dual-stack NAT DNS64 Correct Answer: C Section: Infrastructure Services Explanation Explanation/Reference: Explanation: NAT64 is a mechanism to allow IPv6 hosts to communicate with IPv4 servers. D.0. C. In this example. Which feature allows IPv6 devices to communicate with IPv4 servers? A. Which type of statistics does the engineer see? A. E. the control protocol is disabled on the source (Device B).wikipedia. B. This action allows the responder to reply to the TCP Connect www. Reference: http://en.IPv6 has just been deployed to all of the hosts within a network. connectionless-oriented service-oriented connection-oriented application-oriented Correct Answer: C Section: Infrastructure Services Explanation Explanation/Reference: Explanation: Configuration Examples for IP SLAs TCP Connect Operations The following example shows how to configure a TCP Connection-oriented operation from Device B to the Telnet port (TCP port 23) of IP Host 1 (IP address 10.1). but not to the servers. as shown in the "TCP Connect Operation" figure in the "Information About the IP SLAs TCP Connect Operation" section. IP SLAs uses the control protocol to notify the IP SLAs responder to enable the target port temporarily.0. B. D. see RFC 6052. The NAT64 server is the endpoint for at least one IPv4 address and an IPv6 network segment of 32-bits (for instance 64:ff9b::/96.vceplus.Website designed to help IT pros advance their careers.

com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15. www.0.mt-book/ sla_tcp_conn. Flow-set marking in 1280-byte or larger packets is enabled. . D. C. because the target is not a Cisco device and a well. In this example.1 port 23 Reference: http://www.com . Enter your password if prompted. SUMMARY STEPS 1. exit 5. What is the result? A. Example: Device> enable Step 2 configure terminal Enters global configuration mode. Device A (target device) Configuration configure terminal ipsla responder tcp-connect ipaddress 10. IPv6 PMTU is enabled on the router. Flow-label marking in 1280-byte or larger packets is enabled.html QUESTION 65 A network engineer executes the ipv6 flowset command.operation. B. ipv6flowset 4.vceplus. configure terminal 3. clear ipv6 mtu DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC mode.Website designed to help IT pros advance their careers. IPv6 flow control is enabled on the router. enable 2.0. Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: Enabling Flow-Label Marking in Packets that Originate from the Device This feature allows the device to track destinations to which the device has sent packets that are 1280 bytes or larger. there is no need to send the control message.known TCP port is used.cisco.

1. Which line in the output indicates that the send queue is full and export packets are not being sent? A. Example: Device(config)# ipv6 flowset Reference: http://www.html QUESTION 66 A network engineer executes the show ip flow export command. D. output drops enqueuing for the RP fragmentation failures adjacency issues Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: Table 5 show ip flow export Field Descriptions Field Description Exporting flows to 10.cisco. www. IP address 10.2. Exporting using source Specifies the source address or interface.1. and datagrams the total number of flows contained within them.Website designed to help IT pros advance their careers.1 The ports are in parentheses.mt/ip6b-15-mt-book/ip6-mtu-path-disc.Example: Device# configure terminal Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device. .com .com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/15.1 Version 5 flow records Specifies the version of the flow. B. C. 11 flows exported in 8 udp The total number of export packets sent.1 Specifies the export destinations and ports.3.1.1. (1000) and 10.vceplus.

com/c/en/us/td/docs/ios/12_0s/feature/guide/oaggnf.vceplus. 0 export packets were dropped due to IPC rate limiting 0 export packets were Indicates that the send queue was full while dropped due to output the packet was being transmitted. Which functions do the two commands serve in this scenario? A. The command access-list 1 defines interesting traffic that is allowed through the tunnel.cisco. B. possibly because another feature requires running on the packet. The command ipnat inside source list 1 int s0/0 overload provides "many-to-one" access for all devices on a defined segment to share a single IP address upon exiting the external interface. 0 export packets were sent The packet could not be processed by CEF or up to process level by fast switching. 0 export packets were dropped due to adjacency issues 0 export packets were Indicates that the packet was dropped because dropped due to of problems constructing the IP packet.0 flows failed due to lack of No memory was available to create an export export packet packet. C. drops Reference: http://www. . fragmentation failures 0 export packets were dropped due to encapsulation fixup failures 0 export packets were Indicates that there was a problem transferring dropped enqueuing for the the export packet between the RP and the line RP card.com . The command access-list 1 permit any defines only one machine that is allowed through the tunnel.html QUESTION 67 A network engineer is asked to configure a "site-to-site" IPsec VPN tunnel. 0 export packets were Indicates that CEF was unable to switch the dropped due to no fib packet or forward it up to the process level. D.Website designed to help IT pros advance their careers. One of the last things that the engineer does is to configure an access list (access-list 1 permit any) along with the command ipnat inside source list 1 int s0/0 overload. The command ipnat inside source list 1 int s0/0 overload disables "many-to-one" access for all devices on a defined segment to share a single IP address upon exiting the external interface. Correct Answer: D Section: Infrastructure Services Explanation Explanation/Reference: www.

are permitted by access-list 7 has the source address !--.Defines a NAT pool named ovrld with a range of a single IP !--.Translations are overloaded.10.com . ipnat inside source list 7 pool ovrld overload ! ! ! ! !--.10.16.Indicates that any packets received on the inside interface that !--.255.Defines serial 0 with an IP address and as a NAT outside interface.Defines Ethernet 0 with an IP address and as a NAT inside interface.0 ipnat inside !--. interface serial 0 ip address 172.64 255.1.255.1 prefix 24 ! !--. ipnat pool ovrld 172.255.20.0. interface ethernet 1 ip address 10.0 0.address.vceplus.10. access-list 7 permit 10.Explanation: Configuring NAT to Allow Internal Users to Access the Internet Using Overloading NAT Router interface ethernet 0 ip address 10.255.0.1 255.devices to be translated to the same valid IP address.0 ipnat outside !--.Website designed to help IT pros advance their careers. 172.10.16.20. .0 0. !--.255.0.Defines Ethernet 1 with an IP address and as a NAT inside interface.0 ipnat inside !--.255.31 www.0. which allows multiple inside !--.1 255.10.10.10.10.1 172.translated to an address out of the NAT pool named ovrld.16.10.16.31 access-list 7 permit 10.10.

Website designed to help IT pros advance their careers.10. C.com/c/en/us/support/docs/ip/hot-standby-router-protocol. Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. D. Note in the previous second configuration. Reference: http://www.20.com .31 and 10. D.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.vceplus. Track the up/down state of a loopback interface and shut down this interface during maintenance.shtml QUESTION 68 A network engineer is configuring a solution to allow failover of HSRP nodes during maintenance windows.10. B.Access-list 7 permits packets with source addresses ranging from !--.hsrp/13780-6. Which action will allow for manual switching of HSRP nodes? A.10.31. . which allows for maintenance mode.20. Reference: http://www.10. B. E. so when this interface is shut down the HSRP priority for that router will be lowered and the other HSRP router will then become the active one.0 through 10. Which feature should the engineer use to gather the required information? A.10.0 through 10.html QUESTION 69 A network engineer is notified that several employees are experiencing network performance related issues. the HSRP priority is reduced. This means that another HSRP router with higher priority can become the active router if that router has standby preempt enabled.10. information such as the source/destination IP and Layer 4 port numbers is required. as an alternative to powering down the active router and letting the network respond accordingly. and bandwidth-intensive applications are identified as the root cause. Loopback interfaces can be tracked. the NAT pool "ovrld"only has a range of one address.cisco. If the line protocol of the specified interface goes down. Disable and enable all active interfaces on the active HSRP node. SNMP Cisco IOS EEM NetFlow Syslog WCCP www. Adjust the HSRP priority without the use of preemption.cisco.10. In order to identify which specific type of traffic is causing this slowness. The keyword overload used in the ipnat inside source list 7 pool ovrld overload command allows NAT to translate multiple inside devices to the single address in the pool. C.!--. Enable HSRPv2 under global configuration.

What is switching? A Router must make decisions about where to forward the packets passing through. Specifically. B. Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: We came across a recent issue where a user setup a router for NetFlow export but was unable to see the OUT traffic for the interfaces in NetFlow Analyzer.com/en/US/docs/ios-xml/ios/netflow/configuration/12-4t/cfg-nflow. Every NetFlow configuration aspect was checked and nothing incorrect was found. This is why this topic is about Cisco Express Forwarding. Switching is what a router does when it makes the following decisions: www.vceplus.Website designed to help IT pros advance their careers. That is when we noticed the no ipcef` command on the router. NetFlow output has been filtered by default. the network engineer is unable to see OUT traffic on the interfaces. Flow Export version 9 is in use. .html QUESTION 70 An organization decides to implement NetFlow on its network to monitor the fluctuation of traffic that is disrupting core services.cisco. Cisco Express Forwarding has not been configured globally. a flow is identified as the combination of the following key fields: Source IP address Destination IP address Source Layer 4 port number Destination Layer 4 port number Layer 3 protocol type Type of service (ToS) Input logical interface Reference: http://www. NetFlow Analyzer started showing OUT traffic for the interfaces.Correct Answer: C Section: Infrastructure Services Explanation Explanation/Reference: Explanation: NetFlow Flows Key Fields A network flow is identified as a unidirectional stream of packets between a given source and destination--both are defined by a network-layer IP address and transport-layer source and destination port numbers. What can you determine based on this information? A. After reviewing the output of NetFlow. CEF was enabled at the global level and within seconds. The command ip flow-capture fragment-offset has been enabled. D.data-expt. This decision-making process is called switching. C.com .

simply use the no` form of the command.manageengine. ie. B. allows for advanced features like NBAR 3. Reference: https://blogs. called the Forwarding Information Base (FIB). C. what is the next hop of the router and which interface will the router use to get to that destination. 2. To enable CEF. CEF creates its own table. The following command is entered: switch#show flow exporter Flow_Exporter-1 What is the expected output? A. What is CEF? CEF is one of the available switching options for Cisco routers.1. CEF can switch traffic faster than route-caching using fast-switching How to enable CEF? CEF is disabled by default on all routers except the 7xxx series routers. Router#config t Router(config)#ipcef Router(config)# To disable CEF. noipcef. Based on the routing table. Enabling and Disabling CEF is easy. Overall. The FIB is organized differently than the routing table and CEF uses the FIB to decide which interface to send traffic from. Why CEF Needed when enabling NetFlow ? CEF is a prerequisite to enable NetFlow on the router interfaces. If the destination is reachable. the NetFlow packets exported from the router will have Destination interface as null and this leads NetFlow Analyzer to show no OUT traffic for the interfaces. go into global configuration mode and enter the CEF command. D.com . Better performance than fast-switching (the default) and takes less CPU to perform the same task. Whether to forward or not forward the packets after checking that the destination for the packet is reachable.Website designed to help IT pros advance their careers. 2. configuration of the specified flow exporter current status of the specified flow exporter status and statistics of the specified flow monitor configuration of the specified flow monitor Correct Answer: B Section: Infrastructure Services Explanation Explanation/Reference: Explanation: www.in-netflow-data-export. CEF decides through which interface traffic is exiting the router. Any NetFlow analyzer product will calculate the OUT traffic for an interface based on the Destination Interface value present in the NetFlow packets exported from the router. CEF offers the following benefits: 1.com/network-2/netflowanalyzer/2010/05/19/need-for-cef. Without enabling the CEF on the router. the NetFlow packets did not mark the destination interfaces and so NetFlow Analyzer was not able to show the OUT traffic for the interfaces. . If the CEF is disabled on the router.vceplus.html QUESTION 71 A network engineer has left a NetFlow capture enabled over the weekend to gather information regarding excessive bandwidth utilization. When enabled.

B. E.com .cisco.cisco. and redundancy and load sharing. E. C.com/c/dam/en/us/td/docs/solutions/SBA/August2012/Cisco_SBA_BN_IPv6Ad dressingGuide-Aug2012. D.) A. multi homing. . DNS NAT port redirection stateless translation session handling www.Website designed to help IT pros advance their careers. NAT64 NAT44 NATv6 NPTv4 NPTv6 Correct Answer: E Section: Infrastructure Services Explanation Explanation/Reference: Explanation: NPTv6 provides a mechanism to translate the private internal organization prefixes to public globally reachable addresses.show flow exporter exporter-name (Optional) Displays the current status of the specified flow exporter. Example: Device# show flow exporter FLOW_EXPORTER-1 Reference: http://www. D. The use cases for NPTv6 outlined in the RFC include peering with partner networks. 1-to-1.com/en/US/docs/ios-xml/ios/fnetflow/configuration/15-mt/cfg-de.html QUESTION 72 A company's corporate policy has been updated to require that stateless. B. and IPv6 to IPv6 translations at the Internet edge are performed. What is the best solution to ensure compliance with this new policy? A. The translation mechanism is stateless and provides a 1:1 relationship between the internal addresses and external addresses. C.fnflow-exprts.pdf QUESTION 73 Which two functions are completely independent when implementing NAT64 over NAT-PT? (Choose two. Reference: http://www.vceplus.

or an edge network). there are important differences. F. G.Correct Answer: AB Section: Infrastructure Services Explanation Explanation/Reference: Explanation: Network Address Translation IPv6 to IPv4.html QUESTION 74 Which two methods of deployment can you use when implementing NAT64? (Choose two. Differences Between Stateless NAT64 and Stateful NAT64 Stateless NAT64 Stateful NAT64 1:1 translation 1:N translation No conservation of IPv4 address Conserves IPv4 address Assures end-to-end address Uses address overloading. an access. or NAT64. C. stateless stateful manual automatic static functional dynamic Correct Answer: AB Section: Infrastructure Services Explanation Explanation/Reference: Explanation: While stateful and stateless NAT64 perform the task of translating IPv4 packets into IPv6 packets and vice versa. hence lacks transparency and scalability in end-to-end address transparency www. D. . technology facilitates communication between IPv6-only and IPv4-only hosts and networks (whether in a transit.vceplus. E.Website designed to help IT pros advance their careers. which is essential to the superiority of NAT64 over NAT-PT.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6. The following table provides a high-level overview of the most relevant differences. Table 2. Reference: http:// www.com . B.solution/white_paper_c11-676278.cisco. This solution allows both enterprises and ISPs to accelerate IPv6 adoption while simultaneously handling IPv4 address depletion. The DNS64 and NAT64 functions are completely separated.) A.

Manual.solution/white_paper_c11-676277. C. You add the record to the flow monitor after you create the flow monitor. which is configured for the flow monitor and stored in the flow monitor cache. D.vceplus.cisco. B.Website designed to help IT pros advance their careers. . The flow monitor cache is automatically created at the time the flow monitor is applied to the first interface. Flow monitors consist of a record and a cache.com/c/en/us/td/docs/ios/fnetflow/command/reference/fnf_book/fnf_01. Reference: http://www.html QUESTION 75 Which NetFlow component is applied to an interface and collects information about flows? A.com .cisco.No state or bindings created on the State or bindings are created on every translation unique translation Requires IPv4-translatable IPv6 No requirement on the nature of IPv6 addresses assignment (mandatory address assignment requirement) Requires either manual or DHCPv6 Free to choose any mode of IPv6 based address assignment for IPv6 address assignment viz. Flow data is collected from the network traffic during the monitoring process based on the key and nonkey fields in the record. Which statement about the output of the show flow-sampler command is true? www. hosts DHCPv6. flow monitor flow exporter flow sampler flow collector Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: Flow monitors are the NetFlow component that is applied to interfaces to perform network traffic monitoring.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6.html#w p1314030 QUESTION 76 Refer to the exhibit. SLAAC Reference: http://www.

In the random sampling mode that Random Sampled NetFlow uses.1 5858? A. The sampler matched 10 packets.10. www. 302nd. It configures the router to export cache flow information about flows with destination IP 10.vceplus. For example.1 on port UDP/5858. 120th. It configures the router to export cache flow information to IP 10.1 and port UDP/5858. Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: The sampling mode determines the algorithm that selects a subset of traffic for NetFlow processing.10.10. incoming packets are randomly selected so that one out of each n sequential packets is selected on average for NetFlow processing.Website designed to help IT pros advance their careers. B.10.10. 199th.com/c/en/us/td/docs/ios/12_0s/feature/guide/nfstatsa. then NetFlow might sample the 5th. one packet every 100 seconds. if you set the sampling rate to 1 out of 100 packets.com . C. C. The sampler matched 10 packets.1 on port UDP/5858. The n value is a parameter from 1 to 65535 packets that you can configure. This sample configuration provides NetFlow data on 1 percent of total traffic.10. each packet randomly chosen from every group of 100 packets. The sampler matched 10 packets. and so on packets. It configures the router to receive cache flow information from IP 10. The sampler matched 10 packets.10.1 and port UDP/5858. D. each one randomly chosen from every 100-second interval. Table 2 show flow-sampler Field Descriptions Field Description Sampler Name of the flow sampler id Unique ID of the flow sampler packets matched Number of packets matched for the flow sampler mode Flow sampling mode sampling interval is Flow sampling interval (in packets) Reference: http://www.html#wp1084291 QUESTION 77 What is the result of the command ip flow-export destination 10.10.A. .10. one packet every 100 packets. D. B.10. It configures the router to receive cache flow information about flows with destination IP 10.cisco.

• The routing protocol must be enabled for each interface using the most specific wildcard mask possible. ROUTE.vceplus.IP address of the workstation to which you want to send the address NetFlow information. The SO/O interface on Chicago and the SO/1 interface on NewYork are in Area 0.168.Correct Answer: A Section: Infrastructure Services Explanation Explanation/Reference: Explanation: To enable the exporting of information in NetFlow cache entries.168. OSPF has been configured on routers Chicago and NewYork. However.Link between Chicago and NewYork Loopback0 172. • The routing protocol for each interface must be enabled under the routing process.168.com/c/en/us/td/docs/ios/12_0s/feature/guide/12s_mdnf.9/30 .Website designed to help IT pros advance their careers. Reference: http://www.com's corporate implementation guidelines require: • The OSPF process ID for all routers must be 10.Link between Chicago and NewYork S0/1 192. they cannot ping from the serial interface of the Seattle router to the loopback interface of the NewYork router.com is a small IT corporation that is attempting to implement the network shown in the exhibit.html#wp1023091 QUESTION 78 Route.54.Link between Seattle and Chicago Secre Password: cisco NewYork S0/1 192. Currently the implementation is partially completed. • The serial link between Seattle and Chicago must be in OSPF area 21.5/30 .cisco. The loopbackO interface on NewYork is in Area 1. use theip flow-export destination command in global configuration mode.16.54.6/30 .189. Network Information Seattle S0/0 192.Link between Seattle and Chicago Secret Password: cisco Chicago S0/0 192.189 www.com . udp-port UDP protocol-specific port number. • OSPF area 21 must not receive any inter-area or external routes.168. .16. You have been asked to complete the implementation to allow this ping.10/30 .16. Syntax Description ip.

com .Website designed to help IT pros advance their careers.vceplus. .Secret Password: cisco www.

com . .vceplus.www.Website designed to help IT pros advance their careers.

vceplus. .Website designed to help IT pros advance their careers.www.com .

vceplus.Correct Answer: Answer: Here is the solution below: Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: www.com . .Website designed to help IT pros advance their careers.

16. www.16.4 Broadcast Address: 192. Subnet Mask: (Network Bits – 1’s.Note: In actual exam.255.16.16. .16.Website designed to help IT pros advance their careers. IP Address: 192.168. 256-252 = 4.168. First.168.5 /30 Subnet Mask: 255. Host Bits – 0’s) Lets find the wildcard mask of /30.5/30. but the overall solution is the same. find the 4th octet of the Network Address: The 4th octet of IP address (192. and router hostnames may change.16. the IP addressing.252 Here subtract 252 from 2565.168. OSPF areas and process ID.vceplus. we need to find the network address and wildcard mask of 192. hence the subnets will increment by 4.5/30 in order to configure the OSPF. Network Address: 192.5) belongs to subnet 1 (4 to 7).168.com . Seattle’s S0/0 IP Address is 192. So.7 Lets find the wildcard mask of /30.168.255.

16.0. Seattle(config-router)#area 21 stub Seattle(config-router)#end Seattle#copy run start Chicago Configuration: Chicago>enable Password: cisco Chicago#conf t Chicago(config)#router ospf 10 We need to add Chicago’s S0/1 interface to Area 21 www.Now we configure OSPF using process ID 10 (note the process ID may change to something else in real exam). .vceplus.Website designed to help IT pros advance their careers.4 0.com . Seattle>enable Password: Seattle#conf t Seattle(config)#router ospf 10 Seattle(config-router)#network 192.0.168.3 area 21 One of the tasks states that area 21 should not receive any external or inter-area routes (except the default route).

And if we don’t want to send inter-area routes.0.0.168.com . Currently EIGRP is configured on all routers R2. Chicago(config-router)#area 21 stub no-summary Chicago(config-router)#end Chicago#copy run start The other interface on the Chicago router is already configured correctly in this scenario. we must stop LSA Type 5 if we don’t want to send external routes. The remote office router (R3) was previously configured and all corporate subnets were reachable from R3. R3. QUESTION 79 S Industries has expanded their business with the addition of their first remote office. Once the issue has been resolved you should complete the task by configuring route summarization only to the remote office router R3. You have corrected the fault when pings from R2 to the R3 LAN interface are successful. . JS Industries is interested in using route summarization along with the EIGRP Stub Routing feature to increase network stability while reducing the memory usage and bandwidth utilization to R3. Your task is to identify and resolve the cause of connectivity failure with the remote office router R3.0. However. Another network professional was tasked with implementing this solution.4 0.0. and the R3 IP routing table only contains 2 10. In order to accomplish this.16. in the process of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been lost. area 21 should not receive any external or inter-area routes (except the default route).3 area 21 Again.Chicago(config-router)#network 192. www. and R4 in the network. as well as the New York router so there is nothing that needs to be done on that router. Therefore we want to configure area 21 as a totally stubby area. we have to stop LSA Type 3 and Type 4.0 subnets.vceplus.Website designed to help IT pros advance their careers.

vceplus.Website designed to help IT pros advance their careers. .com .www.

www.Website designed to help IT pros advance their careers. .vceplus.com .

vceplus.com . .Website designed to help IT pros advance their careers.www.

com . Use the show running-config command on router R3.Correct Answer: Answer: Here are the solution as below: Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: First we have to figure out why R3 and R4 can not communicate with each other. www.Website designed to help IT pros advance their careers.vceplus. .

Notice that the eigrp stub command equals to the eigrp stub connected summary because the connected and summary options are enabled by default.0. This keyword will also prevent any type of route from being sent. Next we will configure router R3 so that it has only 2 subnets of 10.vceplus.0 network.Website designed to help IT pros advance their careers.com .0. The receive-only keyword will restrict the router from sharing any of its routes with any other router in that EIGRP autonomous system.Notice that R3 is configured as a stub receive-only router. . Therefore we will remove this command and replace it with the eigrp stub command: R3# configure terminal R3(config)# router eigrp 123 R3(config-router)# no eigrp stub receive-only R3(config-router)# eigrp stub R3(config-router)# end Now R3 will send updates containing its connected and summary routes to other routers. Use the show ip route command on R3 to view its routing table: www.

2.0. R4> enable R4# conf t R4(config)# interface s0/0 R4(config-if)# ip summary-address eigrp 123 10. In the output if we don’t see the summary line (like 10. which is a directly connected network of R3. In conclusion.0 255.0 255.Because we want the routing table of R3 only have 2 subnets so we have to summary sub-networks at the interface which is connected with R3.0.0.0 so that all the ping can work well.0.vceplus. There is one interesting thing about the output of the show ip route shown above: the 10.255.0 at the interface s0/0 of R4 to summary. the s0/0 interface of R4.0.2.2.0 Now we jump back to R3 and use the show ip route command to verify the effect. we will use the ip summary-address eigrp 123 10.3.0 255.com .255. to make the routing table of R3 has only 2 subnets we have to summary other subnets into one subnet.255.0/8 is a summary…) then we should use the command ip summary-address eigrp 123 10.0/24.0.2.Website designed to help IT pros advance their careers. the output is shown below: www. Therefore.0.0. . We can’t get rid of it in the routing table no matter what technique we use to summary the networks.

0/8 to summary.255. Null0" then you can summarize using the network 10. Finally don’t forget to use the copy run start command on routers R3 and R4 to save the configurations. notice that if you use another network than 10. if you use the command ip summary-address eigrp 123 10.0.0. R3(config-if)# end www. Just for your information.0.2.0/8 is a summary.2.Website designed to help IT pros advance their careers.Note: Please notice that the IP addresses and the subnet masks in your real exam might be different so you might use different ones to solve this question.0. . This summarization is better because all the pings can work well.0. for example.0/16.vceplus.0. if you don’t see the line "10.0 you will leave a /16 network in the output of the show ip route command.0 255. But in your real exam.com .0.

vceplus.R3# copy run start R4(config-if)# end R4# copy run start If the “copy run start” command doesn’t work then use “write memory. You will know that you have corrected the fault when R4's loopback address (FEC0:4:4) can be seen in RTs IPv6 routing table. Special Note: To gain the maximum number of points you must remove all incorrect or unneeded configuration statements related to this issue.Website designed to help IT pros advance their careers. However. . R4's loopback address (FEC0:4:4) cannot be seen in R1's IPv6 routing table. www.com is a small IT corporation that has an existing enterprise network that is running IPv6 0SPFv3.com . You are tasked with identifying the cause of this fault and implementing the needed corrective actions that uses OPSF features and does not change the current area assignments. Currently OSPF is configured on all routers.” QUESTION 80 ROUTE.

com . .Website designed to help IT pros advance their careers.www.vceplus.

www.vceplus.com - Website designed to help IT pros advance their careers.

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The output of the "show running-config" command of R3:

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Make sure to remove the incorrect configuration statements to get the full points.vceplus. too. If you want to check the routing information. + Configure virtual link on R2 (from the first output above.com .2) + Configure virtual link on R3 (from the second output above. not "show ip route".2 Save the configuration: R3(config-rtr)#end R3#copy running-config startup-config You should check the configuration of R4.4.3 Save the configuration: R2(config-rtr)#end R2#copy running-config startup-config (Notice that we have to use neighbor router-id 3.3. use the show ipv6 route command.2. we learned that the OSPF process ID of R2 is 1): R2>enable R2#configure terminal R2(config)#ipv6 router ospf 1 R2(config-rtr)#area 11 virtual-link 3. Pay more attention to the outputs of routers R2 and R3 The output of the "show running-config" command of R2: www. not R2's router-id 2.3. The area through which you configure the virtual link is known as a transit area.4"): R3>enable R3#configure terminal R3(config)#ipv6 router ospf 1 R3(config-rtr)#no area 54 virtual-link 4.3.4. routers R2 and R3 must be configured with the area <area id> virtuallink <neighbor router-id>command. the area 11 will become the transit area.4.We knew that all areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0).2.3 R4(config-router)#end After finishing the configuration doesn’t forget to ping between R1 and R4 to make sure they work. Therefore. Note. In some cases. In this case. first issue the show running-config on all of 4 routers.2.3.2. Correct Answer: Answer: Here is the solution below: Section: Layer 3 Technologies Explanation Explanation/Reference: Explanation: To troubleshoot the problem. .3. R4(config)#ipv6 router ospf 1 R4(config-router)#no area 54 virtual-link 3. we can use a virtual link to connect to the backbone through a non-backbone area.3.Website designed to help IT pros advance their careers.3.4. we learned that the OSPF process ID of R3 is 1 and we have to disable the wrong configuration of "area 54 virtual-link 4.4 R3(config-rtr)#area 11 virtual-link 2. where this is not possible.

2.3.4"): R3>enable R3#configure terminal R3(config)#ipv6 router ospf 1 R3(config-rtr)#no area 54 virtual-link 4. we learned that the OSPF process ID of R3 is 1 and we have to disable the wrong configuration of "area 54 virtual-link 4. + Configure virtual link on R2 (from the first output above. not R2's router-id 2.4.2) + Configure virtual link on R3 (from the second output above. In some cases.The output of the "show running-config" command of R3: We knew that all areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). we learned that the OSPF process ID of R2 is 1): R2>enable R2#configure terminal R2(config)#ipv6 router ospf 1 R2(config-rtr)#area 11 virtual-link 3. In this case.2.2 Save the configuration: R3(config-rtr)#end R3#copy running-config startup-config www. where this is not possible.3 Save the configuration: R2(config-rtr)#end R2#copy running-config startup-config (Notice that we have to use neighbor router-id 3. . Therefore.2.vceplus.Website designed to help IT pros advance their careers.4.3.4 R3(config-rtr)#area 11 virtual-link 2.2. we can use a virtual link to connect to the backbone through a non-backbone area. routers R2 and R3 must be configured with the area <area id> virtuallink <neighbor router-id>command. the area 11 will become the transit area.3.3.4.3.com . The area through which you configure the virtual link is known as a transit area.4.

IT policy requires that all outbound HTTP traffic use the frame relay link when it is available.3 R4(config-router)#end After finishing the configuration doesn’t forget to ping between R1 and R4 to make sure they work.3.com . not "show ip route". Choose and configure the appropriate path selection feature to accomplish this task. Make sure to remove the incorrect configuration statements to get the full points.You should check the configuration of R4.Website designed to help IT pros advance their careers. one via a frame relay link and one via an EoMPLS link. All other traffic may use either link. No static or default routing is allowed. QUESTION 81 You are a network engineer with ROUTE. a small IT company. Note.3. If you want to check the routing information. .com has two connections to the Internet. use the show ipv6 route command.vceplus. You may use the Test Workstation to generate HTTP traffic to validate your solution. too. R4(config)#ipv6 router ospf 1 R4(config-router)#no area 54 virtual-link 3. www. ROUTE.com.

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Section: Layer 3 Technologies Explanation Explanation/Reference: Here are the step by Step Solution for this: 1) First create the access list that catches the HTTP traffic: R1(config)#access-list 101 permit tcp any any eq www 2) Configure the route map that sets the next hop address to be ISP1 and permits the rest of the traffic: R1(config)#route-map pbr permit 10 R1(config-route-map)#match ip address 101 R1(config-route-map)#set ip next-hop 10.vceplus.1.Correct Answer: Answer: We need to configure policy based routing to send specific traffic along a path that is different from the best path in the routing table.com .Website designed to help IT pros advance their careers.100. .2 www.

They have recently merged two organizations and now need to merge their networks as shown in the topology exhibit. You may add new commands or change default values. www. You have been tasked with completing the implementation and ensuring that the network requirements are met. .Website designed to help IT pros advance their careers. a small IT company.com . No static or default routing is allowed in either network. QUESTION 82 You are a network engineer with ROUTE. The network requirements state that you must be able to ping and telnet from loopback 101 on R1 to the OPSF domain test address of 172. R4 has been added to the existing OSPF network to provide the interconnect between the OSPF and EIGRP networks. After that configure the route map and then apply it on the interface to the server in EIGRP network.100. A previous network engineer has started the merger implementation and has successfully assigned and verified all IP addressing and basic IGP routing. Two links have been added that will provide redundancy.16. The redundant paths from the OSPF network to the EIGRP network must be available in case of a link failure.R1(config-route-map)#exit R1(config)#route-map pbr permit 20 3) Apply the route-map on the interface to the server in the EIGRP Network: R1(config-route-map)#exit R1(config)#int fa0/1 R1(config-if)#ip policy route-map pbr R1(config-if)#exit R1(config)#exit Explanation: First you need to configure access list to HTTP traffic and then configure that access list. One network is using OSPF as its IGP and the other is using EIGRP as its IGP. You may not remove or change any of the configuration commands currently on any of the routers. All traffic must use the shortest path that provides the greatest bandwidth.com.vceplus.1.

Reliability.Correct Answer: Answer: First we need to find out 5 parameters (Bandwidth. MTU) of the s0/0/0 interface (the interface of R2 connected to R4) for redistribution: Section: Layer 3 Technologies Explanation Explanation/Reference: R2#show interface s0/0/0 Write down these 5 parameters.vceplus. . Load.Website designed to help IT pros advance their careers. Delay. notice that we have to divide the Delay by 10 because the metric www.com .

we must put the command below under EIGRP process to make traffic from R1 to go through R3 (R1 -> R2 -> R3 -> R4). R2(config-router)# distance eigrp 90 105 This command sets the Administrative Distance of all EIGRP internal routes to 90 and all EIGRP external routes to 105. www. that is 20000 / 10 = 2000) For R3 we use the show interface fa0/0 to get 5 parameters too R3#show interface fa0/0 For example we get Bandwidth=10000 Kbit. we get Bandwidth=1544 Kbit.vceplus.Website designed to help IT pros advance their careers.1 network (the network behind R4) in the routing table of R1 and make a ping from R1 to this network. but the overall solution is the same. Delay=1000 us. Reliability=255. which is better than R1 -> R2 -> R4.100.com . Reliability=255.16. Note: The actual OPSF and EIGRP process numbers may change in the actual exam so be sure to use the actual correct values. MTU=1500 bytes then we would redistribute as follows: R2#config terminal R2(config)# router ospf 1 R2(config-router)# redistribute eigrp 100 metric-type 1 subnets R2(config-router)#exit R2(config-router)#router eigrp 100 R2(config-router)#redistribute ospf 1 metric 1544 2000 255 1 1500 Note: In fact. Load=1. which is smaller than the Administrative Distance of OSPF (110) -> the link between R2 & R3 will be preferred to the serial link between R2 & R4. For example. these parameters are just used for reference and we can use other parameters with no problem. Load=1. MTU=1500 bytes R3#config terminal R3(config)#router ospf 1 R3(config-router)#redistribute eigrp 100 metric-type 1 subnets R3(config)#exit R3(config-router)#router eigrp 100 R3(config-router)#redistribute ospf 1 metric 10000 100 255 1 1500 Finally you should try to “show ip route” to see the 172. Delay=20000 us. Note: If the link between R2 and R3 is FastEthernet link.unit is in tens of microsecond. . If the delay is 20000us then we need to divide it by 10.