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300-101.examcollection.premium.exam.

82qa
Number: 300-101
Passing Score: 800
Time Limit: 120 min
File Version: 1.0

300-101
Implementing Cisco IP Routing
Version 16.1

Question Set 1
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: [none]
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).
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: [none]
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 ip arp 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 level 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
A network engineer notices that transmission rates of senders of TCP traffic sharply increase and decrease simultaneously during periods of congestion. Which
condition causes this?
A.
B.
C.
D.

global synchronization
tail drop
random early detection
queue management algorithm

Correct Answer: A

Section: [none]
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.
Routers on the Internet normally have packet queues, to allow them to hold packets when the network is busy, rather than discarding them.
Because routers have limited resources, the size of these queues is also limited. The simplest technique to limit queue size is known as tail drop. The queue is
allowed to fill to its maximum size, and then any new packets are simply discarded, until there is space in the queue again. This causes problems when used on
TCP/IP routers handling multiple TCP streams, especially when bursty traffic is present. While the network is stable, the queue is constantly full, and there are no
problems except that the full queue results in high latency. However, the introduction of a sudden burst of traffic may cause large numbers of established, steady
streams to lose packets simultaneously.
Reference: http://en.wikipedia.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.)
A.
B.
C.
D.
E.

starvation
jitter
latency
windowing
lower throughput

Correct Answer: ACE
Section: [none]
Explanation
Explanation/Reference:
Explanation:
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. Specifically, TCP transmitters will throttle-back flows when drops have been detected. Although some
UDP applications have application-level windowing, flow control, and retransmission capabilities, most UDP transmitters are completely oblivious to drops and thus
never lower transmission rates due to dropping. When TCP flows are combined with UDP flows in a single service provider class and the class experiences
congestion, then TCP flows will continually lower their rates, potentially giving up their bandwidth to drop-oblivious UDP flows. This effect is called TCP-starvation/
UDP-dominance. This can increase latency and lower the overall throughput.
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. Even if WRED is enabled on the service provider class, the same behavior would be observed, as WRED (for the
most part) only affects TCP-based flows. Granted, it is not always possible to separate TCP-based flows from UDP-based flows, but it is beneficial to be aware of
this behavior when making such application-mixing decisions. Reference: http://www.cisco.com/warp/public/cc/so/neso/vpn/vpnsp/spqsd_wp.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.
B.
C.
D.

dual-stack method
6to4 tunneling
GRE tunneling
NAT-PT

Correct Answer: A
Section: [none]
Explanation
Explanation/Reference:
Explanation:
Dual stack means that devices are able to run IPv4 and IPv6 in parallel. It allows hosts to simultaneously reach IPv4 and IPv6 content, so it offers a very flexible
coexistence strategy. For sessions that support IPv6, IPv6 is used on a dual stack endpoint. If both endpoints support IPv4 only, then IPv4 is used.
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, networks, and applications.
Reference: http://www.cisco.com/web/strategy/docs/gov/IPV6at_a_glance_c45-625859.pdf
QUESTION 6
Which statement about the use of tunneling to migrate to IPv6 is true?
A.
B.
C.
D.

Tunneling is less secure than dual stack or translation.
Tunneling is more difficult to configure than dual stack or translation.
Tunneling does not enable users of the new protocol to communicate with users of the old protocol without dual-stack hosts.
Tunneling destinations are manually determined by the IPv4 address in the low-order 32 bits of IPv4-compatible IPv6 addresses.

Correct Answer: C
Section: [none]
Explanation
Explanation/Reference:
Explanation:
Using the tunneling option, 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. The advantage of this approach is that the new protocol can work without disturbing the old protocol, thus providing connectivity
between users of the new protocol. Tunneling has two disadvantages, as discussed in RFC 6144:
Users of the new architecture cannot use the services of the underlying infrastructure.
Tunneling does not enable users of the new protocol to communicate with users of the old protocol without dual-stack hosts, which negates interoperability.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6- solution/white_paper_c11-676278.html
QUESTION 7
A network administrator executes the command clear ip route. Which two tables does this command clear and rebuild? (Choose two.)
A.
B.
C.
D.

IP routing
FIB
ARP cache
MAC address table

2 · next-hop--The next-hop address · interface--The interface to reach the next-hop address. The TCP Window Scaling enhancement provides that support. Set TCP options to "enabled" 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. B.html QUESTION 8 Which switching method is used when entries are present in the output of the command show ip cache? A. fast switching process switching Cisco Express Forwarding switching cut-through packet switching Correct Answer: A Section: [none] 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. 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). C. The TCP Window Scaling feature complies with RFC 1323. switch(config)# clear ip · prefix/length--Any IP prefix. D. Set window scaling to be used on the remote host. Correct Answer: AB Section: [none] Explanation Explanation/Reference: Explanation: The TCP Window Scaling feature adds support for the Window Scaling option in RFC 1323. Execute the command ip tcp queuemax. Execute the command ip tcp window-size 65536.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/12-4t/iap-12.ht ml#wp1038133 QUESTION 9 Which two actions must you perform to enable and use window scaling on a router? (Choose two.) A. Cisco Express Forwarding table F. Reference: http://www. use the "show ip cache" EXEC command. D. topology table Correct Answer: AB Section: [none] Explanation Explanation/Reference: Explanation: To clear one or more entries in the IP routing table. Reference: http://www. use the following commands in any mode: Command Purpose clear ip route {* | Clears one or more routes from both the {route | unicast RIB and all the module FIBs. Fast switching is enabled by default on all interfaces that support fast switching. Reference: http://www. [vrf vrf-name] Example: · route--An individual IP route.2. To display the routing table cache used to fast switch IP traffic.com/c/en/us/td/docs/ios/12_2/switch/command/reference/fswtch_r/xrfscmd5. E. B.html#GUID-BD998AC6F128-47DD-B5F7-B226546D4B08 QUESTION 10 Which three TCP enhancements can be used with TCP selective acknowledgments? (Choose three. Routers offer better packet-transfer performance when fast switching is enabled. C. The vrf-name can be any case-sensitive.2. In order for this to work. route 10. alphanumeric string up to 32 characters.cisco.) A. E.cisco.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. Destination addresses are stored in the high-speed cache to expedite forwarding. Use the ip tcp window-size command in global configuration mode to configure the TCP window size. B.E.4t-book/iap-tcp. D. TCP Extensions for High Performance . The larger scalable window size will allow TCP to perform better over LFNs. the remote host must also support this feature and its window size must be increased. C. Typical applications use a scale factor of 3 when deployed in LFNs. The prefix/length}[next-hop route options are as follows: interface]} · *--All routes.cisco. Execute the command ip tcp adjust-mss. header compression explicit congestion notification keepalive time stamps TCP path discovery MTU window . The window size can increase to a scale factor of 14. F.

C. It also provides enhanced support for TCP sessions associated with applications. E. The TCP selective acknowledgment mechanism helps improve performance. Because the time stamps are always sent and echoed in both directions and the time-stamp value in the header is always changing. The sender can then resend only missing data segments (instead of everything since the first missing packet). TCP header compression will not compress the outgoing packet. average jitter. 3.cisco. web browsing. If a response packet (a TCP ACK packet) is not received after the device sends a specific number of probes. The benefit of this feature is the reduction of delay and packet loss in data transmissions. and retransmission capabilities. a TCP sender could learn about only one lost packet per-round-trip time. 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: [none] 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. C. Reference: http://www. With selective acknowledgment.html QUESTION 12 Under which condition does UDP dominance occur? A. 5. Specifically. When a TCP connection on a routing device is idle for too long. if TCP lost packets 4 and 7 out of an 8-packet window. Use the ip tcp ecn command in global configuration mode to enable TCP ECN. latency starvation connectionless communication nonsequencing unordered packets jitter Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. Reference: http://www. Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed. but such re-sent segments might have already been successfully received. 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. one-way latency. To allow TCP header compression over a serial link. and transfer of audio and video data that are sensitive to delay or packet loss. B. and connectivity tests. TCP Explicit Congestion Notification The TCP Explicit Congestion Notification (ECN) feature allows an intermediate router to notify end hosts of impending network congestion. The receiving TCP host returns selective acknowledgment packets to the sender.SRND-Book/VPNQoS. Here is a partial sample output from the IP SLA statistics that can be seen: router#show ip sla statistics 1 Round Trip Time (RTT) for Index 55 Latest RTT: 1 ms Latest operation start time: *23:43:31. because of limited information available from cumulative acknowledgments. Refer to RFC 2018 for more details about TCP selective acknowledgment. 2. most UDP transmitters are completely oblivious to drops and. jitter. Use the ip tcp timestamp command to enable the TCP time-stamp option.html#GUID-22A82C5F-631F-43909838-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. This effect is called TCP starvation/UDP dominance. the connection is considered dead and the device initiating the probes frees resources used by the TCP connection. the device sends a TCP keepalive packet to the peer with only the Acknowledgment (ACK) flag turned on. When TCP flows are combined with UDP flows within a single service-provider class and the class experiences congestion.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. An aggressive sender could choose to resend packets early. 6. There is no performance impact when the feature is enabled but not used. Packets 4 through 8 would need to be re-sent.cisco. In other words. Prior to this feature. TCP Time Stamp The TCP time-stamp option provides improved TCP round-trip time measurements. such as Telnet. TCP Keepalive Timer The TCP Keepalive Timer feature provides a mechanism to identify dead connections. B.cisco. informing the sender of data that has been received. the same behavior would be observed because WRED (for the most part) manages congestion only on TCP-based flows. Only packets 4 and 7 must be re-sent. Even if WRED is enabled on the service-provider class. and 3. the TCP time-stamp option is disabled. TCP receives acknowledgment of packets 1. TCP would receive acknowledgment of only packets 1. D. thus.html . flow control.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a0 0802d5efe. Prior to selective acknowledgment. MOS.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS. Use the ip tcp selective-ack command in global configuration mode to enable TCP selective acknowledgment. Several SNMP traps are available: round trip time. TCP flows continually lower their transmission rates. packet loss. Although some UDP applications have application-level windowing. the receiver can acknowledge packets received out of order. potentially giving up their bandwidth to UDP flows that are oblivious to drops. Which UDP characteristic does this scenario describe? A.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/xe-3s/asr1000/iap-xe-3s-asr1000-book/iap-tcp. Each measurement operation can monitor against a pre-set performance threshold. never lower transmission rates because of dropping.Correct Answer: BCD Section: [none] Explanation Explanation/Reference: Explanation: TCP Selective Acknowledgment The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one TCP window of data. 2. TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window. and 8. TCP transmitters throttle back flows when drops are detected. D.

.

Step 2 configure terminal Enters global configuration mode. Which technology. E. Execute the vpdn enable command. The benefit of using CHAP authentication is that the remote device's password is never transmitted in clear text (encrypted). Example: Router# configure terminal Step 3 vpdn enable Enables virtual private dialup Example: networking.html QUESTION 2 A network engineer has been asked to ensure that the PPPoE connection is established and authenticated using an encrypted password.Question Set 1 QUESTION 1 Prior to enabling PPPoE in a virtual private dialup network group. PAP dot1x IPsec CHAP ESP Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: With PPPoE.ht ml QUESTION 3 A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP. The CHAP packet requests or "challenges" the remote device to respond. vpdn enable 4. Enable QoS FIFO for PPPoE support. Execute the no switchport command. enable 2. B. and the random number. Which feature can be used to accomplish this task? A. the remote device's password. The remote device sends the results back to the access server. configure terminal 3. Restrictions This task applies only to releases prior to Cisco IOS Release 12. Disable CDP on the interface. and then encrypts all of it using the remote device's password. C. which task must be completed? A. Router(config-vpdn)# requestdialin Step 6 protocol pppoe Enables the VPDN subgroup to Example: establish PPPoE Router(config-vpdn-req-in)# pro tocol pppoe Reference: http://www.cisco. B.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfathen. The access server then encrypts the concatenated information with the newly retrieved password--if the result matches the result sent in the response packet. The retrieved password should be the same password the remote device used in its encryption process. in combination with PPPoE. When the remote device receives the challenge packet.cisco. along with the name associated with the password used in the encryption process. request-dialin 6. authentication succeeds. can be used for authentication in this manner? A. a random number. The challenge packet consists of an ID. C. protocol pppoe DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC mode. it concatenates the ID. D. Correct Answer: B Section: [none] 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.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ftpppoec_support_TSD_Island _of_Content_Chapter. When the access server receives the response. E. TCP Adjust Dialer Persistent PPPoE Groups half-bridging Peer Neighbor Route Correct Answer: B . vpdn-group name 5. C. SUMMARY STEPS 1. This prevents other devices from stealing it and gaining illegal access to the ISP's network. D. even if no interesting traffic exists. Router(config)# vpdn-group group1 Step 5 request-dialin Creates a request-dialin VPDN Example: subgroup. it uses the name it received to retrieve a password stored in its user database. Reference: http://www. the two authentication options are PAP and CHAP. When CHAP is enabled on an interface and a remote device attempts to connect to it. B. Router(config)# vpdn enable Step 4 vpdn-group name Associates a VPDN group with a Example: customer or VPDN profile.2(13)T. and the host name of the local router. Example: · Enter your password if Router> enable prompted. the access server sends a CHAP packet to the remote device. D.

The remote node responds with a value calculated using a one-way hash function. dialer persistent. otherwise. Step 2 Router(config-if)# ip address Specifies the IP address and mask address mask of the dialer interface as a node in the destination network to be called.cisco. C. Step 3 Router(config-if)# encapsulation Specifies the encapsulation type. Step 6 Router(config-if)# dialer-group Assigns the dialer interface to a group-number dialer group.com/c/en/us/td/docs/ios/12_2/wan/configuration/guide/fwan_c/wcffrely. If interesting traffic arrives before the timer expires.ppp-callin-hostname. the table is then used to supply the next-hop protocol address or the DLCI for outgoing traffic. C. number] Reference: http://www. The host checks the response against its own calculation of the expected hash value. D. PAP authentication does not provide any protection against playback and line sniffing. To configure a dialer interface as persistent. even in seconds | max-attempts the absence of interesting traffic.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia_dia ler_persist. The command provides a default timer interval. Responses to Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server. Step 5 Router(config-if)# dialer pool Specifies the dialing pool to use number for calls to this destination. 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. When configured. B. If the values match.cisco.html QUESTION 6 What is the default OSPF hello interval on a Frame Relay point-to-point network? A. Step 7 Router(config-if)# dialer-list Specifies an access list by list dialer-group protocol protocol.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10241. After the PPP link is established. type Step 4 Router(config-if)# dialer string Specifies the remote destination to dial-string class class-name call and the map class that defines characteristics for calls to this destination. Reference: http://www. Step 8 Router(config-if)# dialer (Optional) Specifies the remote-name user-name authentication name of the remote router on the destination subnetwork for a dialer interface.cisco. allows a dial-on-demand routing (DDR) dialer profile connection to be brought up without being triggered by interesting traffic. B. the host sends a "challenge" message to the remote node.html QUESTION 4 Which PPP authentication method sends authentication information in cleartext? A. CHAP authentication. on the other hand. MS CHAP CDPCP CHAP PAP Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: PAP authentication involves a two-way handshake where the username and password are sent across the link in clear text. Reference: http://www. the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires.number or by protocol and list name {permit | deny | list number to define the interesting access-list-number} packets that can trigger a call. the authentication is acknowledged. Frame Relay inverse ARP static DLCI mapping Frame Relay broadcast queue dynamic DLCI mapping Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a specific connection. C. D. the connection is still brought up and set as persistent. B. Step 9 Router(config-if)# dialer Forces a dialer interface to be persistent [delay [initial] connected at all times. hence. or you can set a custom timer interval.html QUESTION 5 Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection? A. given its known DLCI. 10 20 30 40 Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: 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 ip ospf network command: Point-to-Point Point-to-Multipoint .Section: [none] Explanation Explanation/Reference: Explanation: A new interface configuration command. the connection is terminated. D. periodically verifies the identity of the remote node using a three-way handshake.

PPP Session Phase--In this phase. a Session ID is assigned and the PPPoE layer is established. C. called an access concentrator. PPP options are negotiated and authentication is not performed. D.html QUESTION 8 Which statement is true about the PPP Session Phase of PPPoE? A. PPP options are negotiated and authentication is performed. PPP options are negotiated and authentication is performed. PPP options are negotiated and authentication is performed. called an access concentrator.cisco. a Session ID is assigned and the PPPoE layer is established. During this phase. C.22. Once the link setup is completed.com/c/en/us/td/docs/security/asa/asa92/configuration/vpn/asa-vpn. Once the link setup is completed. PPP options are not negotiated and authentication is performed.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. Reference: http://www. allowing data to be transferred over the PPP link within PPPoE headers. During this phase. the PPPoE client locates a PPPoE server.cisco. PPPoE functions as a Layer 2 encapsulation method. PPPoE functions as a Layer 3 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers. Once the link setup is completed. PPP options are automatically enabled and authorization is performed. Once the link setup is completed. PPPoE functions as a Layer 2 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers. 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: [none] Explanation Explanation/Reference: Explanation: PPPoE is composed of two main phases: Active Discovery Phase--In this phase. D.html QUESTION 7 PPPoE is composed of which two phases? A. B. PPPoE functions as a Layer 4 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers. Once the link setup is completed. Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: PPPoE is composed of two main phases: Active Discovery Phase--In this phase. PPPoE functions as a Layer 2 encapsulation method that allows data to be encrypted over the PPP link within PPPoE headers. allowing data to be transferred over the PPP link within PPPoE headers. PPPoE functions as a Layer 2 encapsulation method.cli/vpn-pppoe. Reference: http://www. Once the link setup is completed. PPP Session Phase--In this phase.cli/vpn-pppoe.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13693. the PPPoE client locates a PPPoE server.cisco. B.html .com/c/en/us/td/docs/security/asa/ asa92/configuration/vpn/asa-vpn.

google.0. If a node responds with a Neighbor Advertisement message with tentative address as the target address.0. manual configuration is required.0. YOU won't know about the route and therefore won't send it to anyone else downstream. Before the link-local address can be assigned to the interface. and was asked to document the IPv6 address of the router. 2001:DB8:0:1:C601:42FF:FE0F:7 2001:DB8:0:1:FFFF:C601:420F:7 2001:DB8:0:1:FE80:C601:420F:7 2001:DB8:0:1:C601:42FE:800F:7 Correct Answer: A Section: [none] Explanation . B. If no routers are present.0/8 network will not be advertised by Router B because the network statement for the 10.0. The 10.0. It is formed by appending the interface identifier to wellknown link-local prefix FE80 :: 0. If you filter outbound. The 10.0. Correct Answer: E Section: [none] Explanation Explanation/Reference: Explanation: You can filter what individual routes are sent (out) or received (in) to any interface within your EIGRP configuration.168.5. 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.0/16 route and therefore won't send it to anyone else downstream.0/8 network because it is blocked by the ACL.0/8 network can successfully ping users on the 192.0/8 network will not be in the routing table on Router B.0/16 network will be blocked by the ACL.Question Set 1 QUESTION 1 Refer to the exhibit. D.0/8 network. Reference: https://sites. further tasks are performed only by the hosts. B.0. DHCPv6 request router-advertisement neighbor-solicitation redirect Correct Answer: B Section: [none] Explanation Explanation/Reference: Explanation: Autoconfiguration is performed on multicast-enabled links only and begins when a multicast. it assigns that link-local address to the interface.0.enabled interface is enabled (during system startup or manually).16. hosts and routers) begin the process by generating a link-local address for the interface. the node performs the Duplicate Address Detection mechanism to see if any other node is using the same link-local address on the link.420F.0/24 cannot successfully ping users on the 10.0.com/site/amitsciscozone/home/important-tips/ipv6/ipv6-stateless.168. One example is noted above. Users on the 10. C. The router has the following interface parameters: mac address C601. B.0/24 network. If routers are present. it has IP-connectivity to other neighbors on this link.0. the Router Advertisements notify what sort of configurations the hosts need to do and the hosts receive a global unicast IPv6 address. Traffic from the 172. Which one statement is true? A. C. The interface identifier replaces the right-most zeroes of the link-local prefix.0.0007 subnet 2001:DB8:0:1::/64 Which IPv6 addresses should the engineer add to the documentation? A.16.autoconfiguration QUESTION 3 An engineer has configured a router to use EUI-64. D.5. the next neighbor(s) will not know about anything except the 172. The autoconfiguration on the routers stop at this stage. the address is a duplicate address and must not be used. Router B will not advertise the 10. Once the node verifies that its tentative address is unique on the link. Which message is required to obtain a global unicast address when a router is present? A. If you filter inbound. Hence. C.0.0. E. QUESTION 2 A router with an interface that is configured with ipv6 address autoconfig also has a link-local address assigned. but users on the 192. At this stage. The routers will need manual configuration (or stateful configuration) to receive site-local or global addresses. The next phase involves obtaining Router Advertisements from routers if any routers are present on the link.0.0/8 network is missing from Router B. a stateful configuration is required. D. Nodes (both.

Explanation/Reference: Explanation: Extended Unique Identifier (EUI). B.1.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_a1. DHCPACK. autonomous-system autonomous-system-number no autonomous-system autonomous-system-number Reference: http://www. Reference: https:// supportforums. D.html QUESTION 5 What is the purpose of the autonomous-system {autonomous-system-number} command? A. D. It sets the global EIGRP autonomous system number. The Mac address is first separated into two 24-bits. needs to be inverted. use the autonomous-system command in address-family configuration mode. B.cisco. or DHCPLEASEQUERY packet) from a DHCP server outside the network or firewall. It sets the global BGP autonomous system number. D. The reason for inverting can be found in RFC4291 section 2. the globally unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses has 1 configured. with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. Therefore.os/unicast/configuration/guide/l3_cli_nxos/l3_ospfv3.com/document/100566/understanding-ipv6-eui-64-bit. B. This check is performed only if the DHCP snooping MAC address verification option is turned on. IPv6 traffic filtering can be implemented only on SVIs. It is worth noticing that in the OUI portion.address QUESTION 4 For security purposes.cisco. This bit identifies whether this interface identifier is universally or locally administered. C. the address is globally unique. DHCPNAK. when the bit is inverted. The 16bit 0xFFFE is then inserted between these two 24-bits to for the 64-bit EUI address. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the EUI-48 MAC address. which caused the neighbor relationships to fail. The global anycast address must be added to the traffic filter to allow OSPFv3 to work properly.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx. It sets the EIGRP autonomous system number in a VRF. This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4. To remove the autonomous-system for an EIGRP routing process from within a VPN VRF instance. it maintains its original scope (global unique address is still global unique and vice versa). It sets the BGP autonomous system number in a VRF. Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: OSPFv3 uses link-local IPv6 addresses for neighbor discovery and other features. Here is an example showing how the Mac Address is used to generate EUI. · The switch receives a DHCPRELEASE or DHCPDECLINE message from . allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64). as per RFC2373. If 0. the address is locally administered and if 1. use the no form of this command. or the universal/local (U/L) bit.cisco. 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. Reference: http://www.htm l#wp1062796 QUESTION 6 Which type of traffic does DHCP snooping drop? A. discover messages DHCP messages where the source MAC and client MAC do not match traffic from a trusted DHCP server to client DHCP messages where the destination MAC and client MAC do not match Correct Answer: B Section: [none] Explanation Explanation/Reference: Explanation: The switch validates DHCP packets received on the untrusted interfaces of VLANs with DHCP snooping enabled. OSPFv3 neighbor adjacencies were lost. 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. What caused this issue? A. shortly after implementing the traffic filter. Next. the seventh bit from the left. The link-local addresses that were used by OSPFv3 were explicitly denied. C. and the source MAC address and the DHCP client hardware address do not match. However. Correct Answer: A Section: [none] 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. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. The switch receives a packet on an untrusted interface. C. The traffic filter is blocking all ICMPv6 traffic. an IPv6 traffic filter was configured under various interfaces on the local router.5.

html QUESTION 10 After you review the output of the command show ipv6 interface brief.0/8 networks. D. so the correct command is "distribute list 2 out FastEthernet0/0. router Reference: http://www. The IPv6 universal/local flag (bit 7) was flipped. Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: show ipv6 traffic Field Descriptions Field Description source. where X is any value in the 0-255 range.0. Reference: http:// www. distribute list 1 out distribute list 1 out FastEthernet0/0 distribute list 2 out distribute list 2 out FastEthernet0/0 Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: Access list 2 is more specific. routed truncated Number of truncated packets.0/24." QUESTION 8 Which prefix is matched by the command ip prefix-list name permit 10. allowing only 1. Configure the port on the edge switch that connects to the aggregation switch as a trusted port.2SX/configuration/guide/book/snoodhcp.0.24 matches this. The addresses were misconfigured and will not function as intended. This translate to any prefix in the 10. which enables untrusted aggregation. OSPFv3 timers were adjusted for fast convergence.0. B. you see that several IPv6 addresses have the 16-bit hexadecimal value of "FFFE" inserted into the address. C.9.x.0/16 10. Only the choice of 10.8.switch ports to accept DHCP packets that include option-82 information. and the interface information in the binding table does not match the interface on which the message was received. B.0/24 10.3.0. IEEE EUI-64 was implemented when assigning IPv6 addresses on the device. Why is the routing information not being learned by Router B? A. errors the version number.8.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12. Based on this information. D.cisco.0/24 10. C.0. An IPv6 traffic filter is blocking the networks from being learned via the Router B interface that is connected to Router A.cisco. B. C. D.0/24 network out of FastEthernet 0/0? A.2. After debugging IPv6 packets.Number of source-routed packets.com/c/en/us/td/docs/ios/ipv6/command/reference/ipv6_book/ipv6_16.3.0/23 Correct Answer: B Section: [none] Explanation Explanation/Reference: Explanation: With prefix lists.an untrusted host with an entry in the DHCP snooping binding table.0.0/16 ge 24 le 24? A. IPv6 unicast routing is not enabled on Router A or Router B. To support trusted edge switches that are connected to untrusted aggregation-switch ports. C. so only a /24 is both greater than or equal to 24 and less than or equal to 24. . you can enable the DHCP option-82 on untrusted port feature. format Errors that can result from checks performed on header fields.0.0/24 network.2.html QUESTION 7 Refer to the exhibit.0. whereas access list 1 permits all 1.8.8. D.0. and packet length.8.8. the message "not a router" is found in the output.0. The networks that are advertised from Router A do not show up in Router B's routing table.1. not a Message sent when IPv6 unicast routing is not enabled. what do you conclude about these IPv6 addresses? A. 10. The networks were not advertised properly under the OSPFv3 process.0. Which command only announces the 1. The switch receives a DHCP packet that includes a relay agent IP address that is not 0. IPv6 addresses containing "FFFE" indicate that the address is reserved for multicast. the ge 24 term means greater than or equal to a /24 and the le 24 means 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. B. QUESTION 9 Router A and Router B are configured with IPv6 addressing and basic routing capabilities using OSPFv3.

are sent by hosts at system startup so that the host can immediately autoconfigure without needing to wait for the next scheduled RA message. 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. . with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. Correct Answer: B Section: [none] Explanation Explanation/Reference: Explanation: Router Advertisements (RA) are sent in response to router solicitation messages. the unicast address of the interface sending the router solicitation message is used as the source address in the message. the globally unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses has 1 configured. The destination address in router solicitation messages is the all-routers multicast address with a scope of the link. This bit identifies whether this interface identifier is universally or locally administered. which is statically defined by the network administrator. Here is an example showing how a the Mac Address is used to generate EUI. the source address in router solicitation messages is usually the unspecified IPv6 address (0:0:0:0:0:0:0:0). as per RFC2373.E. Once the above is done. The reason for inverting can be found in RFC4291 section 2. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the an EUI-48 MAC address.addrg_bsc_con.address QUESTION 11 A packet capture log indicates that several router solicitation messages were sent from a local host on the IPv6 segment.5. such as the hop limit and MTU a host should use in packets that it originates Reference: http://www.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/ip6. Next. D. B. or the universal/local (U/L) bit.com/document/100566/understanding-ipv6-eui64-bit. the address is locally administered and if 1. All local host traffic will be redirected to the router with the lowest ICMPv6 signature. the address is globally unique. the seventh bit from the left. as well as certain data. when the bit is inverted. but IPv6 Cisco Express Forwarding was disabled. It is worth noticing that in the OUI portion. C. we have a fully functional EUI-64 format address. it maintains its original scope (global unique address is still global unique and vice versa). The 16bit 0xFFFE is then inserted between these two 24-bits to for the 64-bit EUI address. Router acknowledgment messages will be forwarded upstream. Reference: https://supportforums. IPv6 unicast forwarding was enabled.1. If the host has a configured unicast address. allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64). When an RA is sent in response to a router solicitation. if so.cisco. What is the expected acknowledgment and its usage? A. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. Therefore. the destination address in the RA message is the unicast address of the source of the router solicitation message.html QUESTION 12 You have been asked to evaluate how EIGRP is functioning in a customer network. 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. Routers on the IPv6 segment will respond with an advertisement that provides an external path from the local subnet. The Mac address is first separated into two 24-bits. Router solicitation messages. which have a value of 133 in the Type field of the ICMP packet header.cisco. where the DHCP server will allocate addresses to the local host. If 0. This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4. Given that router solicitation messages are usually sent by hosts at system startup (the host does not have a configured unicast address). such as prefix discovery. Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Extended Unique Identifier (EUI). needs to be inverted. the amount of time (in seconds) the router should be used as a default router) Additional information for hosts.

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D.R5-R6 paths. find the IP address of the loopback0 interface on R6: .Traffic from R1 to R61 s Loopback address is load shared between R1-R2-R4-R6 and R1-R3. C. What is the ratio of traffic over each path? A. 1:1 1:5 6:8 19:80 Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: First. B.

6. so we issue the "show ip route 150.We see that it is 150.6.6" command from R1 and see this: Notice the "traffic share count" shows 19 for the first path. and 80 for the second path.1.6. . QUESTION 13 You have been asked to evaluate how EIGRP is functioning in a customer network.1.

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B. QUESTION 14 You have been asked to evaluate how EIGRP is functioning in a customer network. D. C.What type of route filtering is occurring on R6 A. Distribute-list using an ACL Distribute-list using a prefix-list Distribute-list using a route-map An ACL using a distance of 255 Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: The configuration on R6 is as follows: This is a standard distribute list using access list number 1. .

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D.Which key chain is being used for authentication of EIGRP adjacency between R4 and R2? A. C. B. CISCO EIGRP key MD5 Correct Answer: A Section: [none] Explanation Explanation/Reference: R4 and R2 configs are as shown below: .

. QUESTION 15 You have been asked to evaluate how EIGRP is functioning in a customer network.Clearly we see the actual key chain is named CISCO.

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46.168. B.What is the advertised distance for the 192. C.0 network on R1? A. 333056 1938688 1810944 307456 Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: R1's routing table is as follows . D.

46. .168. which is shows as 1810944 for the 192. QUESTION 16 You have been asked to evaluate how EIGRP is functioning in a customer network.0 route.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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10 20 30 40 Correct Answer: B Section: [none] Explanation Explanation/Reference: Explanation: The relevant configuration of R1 is shown below: .What percent of R1's interfaces bandwidth is EIGRP allowed to use? A. D. B. C.

config command. The customer has disabled your access to the show running. .ip bandwidth-percent eigrp 1 20 1 = the EIGRP AS 20 = 20% of the bandwidth QUESTION 17 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.

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The customer has disabled your access to the show running. D.config command. 1858 1601 600 1569 Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Part of the "show ip ospf topology" command on R5 shows this: The Link ID of R3 (3. C. B. .3) shows the age is 1858.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.3.3. QUESTION 18 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.

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120.Which of the following statements is true about the serial links that terminate in R3 A. B.40. 120 The R1-R3 link OSPF timer values should be 10. C.40 R3 is responsible for flooding LSUs to all the routers on the network. The R1-R3 link needs the neighbor command for the adjacency to stay up The R2-R3 link OSPF timer values are 30. D. Correct Answer: B Section: [none] Explanation Explanation/Reference: Explanation: We can see the configured timers using the following command: QUESTION 19 .

config command. . The customer has disabled your access to the show running.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.

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C. The customer has disabled your access to the show running. F. Look for the Area 1 stats which shows this: QUESTION 20 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.How many times was SPF algorithm executed on R4 for Area 1? A. B.config command. D. 1 5 9 20 54 224 Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: This can be found using the "show ip ospf" command on R4. . E.

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Areas of Router 5 and 6 are not normal areas. inspect their routing tables and determine which statement is true? A. C. 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 Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Here are the routing tables of R5 and R6: . D. B. E.

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Network Information Seattle S0/0 192.168. • The routing protocol for each interface must be enabled under the routing process.54.com's corporate implementation guidelines require: • The OSPF process ID for all routers must be 10.Link between Chicago and NewYork Loopback0 172.16. • The routing protocol must be enabled for each interface using the most specific wildcard mask possible. they cannot ping from the serial interface of the Seattle router to the loopback interface of the NewYork router.Link between Chicago and NewYork S0/1 192. ROUTE.168.QUESTION 21 Route.168.6/30 .5/30 . The loopbackO interface on NewYork is in Area 1. Currently the implementation is partially completed.9/30 .com is a small IT corporation that is attempting to implement the network shown in the exhibit. The SO/O interface on Chicago and the SO/1 interface on NewYork are in Area 0. You have been asked to complete the implementation to allow this ping.16.54.168.16. • OSPF area 21 must not receive any inter-area or external routes.Link between Seattle and Chicago Secret Password: cisco Chicago S0/0 192.189 Secret Password: cisco .Link between Seattle and Chicago Secre Password: cisco NewYork S0/1 192.189. • The serial link between Seattle and Chicago must be in OSPF area 21. However. OSPF has been configured on routers Chicago and NewYork.10/30 .

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16. Network Address: 192.255. we need to find the network address and wildcard mask of 192.168.5/30 in order to configure the OSPF. IP Address: 192. hence the subnets will increment by 4.168. Seattle>enable Password: .5 /30 Subnet Mask: 255. and router hostnames may change.168.16. the IP addressing.168. 256-252 = 4.168. find the 4th octet of the Network Address: The 4th octet of IP address (192. Host Bits – 0’s) Lets find the wildcard mask of /30. but the overall solution is the same.16. Now we configure OSPF using process ID 10 (note the process ID may change to something else in real exam).7 Lets find the wildcard mask of /30. Seattle’s S0/0 IP Address is 192.Correct Answer: Answer: Here is the solution below: Section: [none] Explanation Explanation/Reference: Explanation: Note: In actual exam.5) belongs to subnet 1 (4 to 7).16.5/30. So. Subnet Mask: (Network Bits – 1’s.252 Here subtract 252 from 2565.16.16. OSPF areas and process ID. First.168.4 Broadcast Address: 192.255.

Seattle#conf t Seattle(config)#router ospf 10 Seattle(config-router)#network 192.0. and the R3 IP routing table only contains 2 10. And if we don’t want to send inter-area routes.0. we have to stop LSA Type 3 and Type 4. Therefore we want to configure area 21 as a totally stubby area.4 0. Currently EIGRP is configured on all routers R2.16.0.0.3 area 21 One of the tasks states that area 21 should not receive any external or inter-area routes (except the default route). 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. Another network professional was tasked with implementing this solution. In order to accomplish this.0. QUESTION 22 S Industries has expanded their business with the addition of their first remote office. . 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 Chicago(config-router)#network 192.168.4 0. area 21 should not receive any external or inter-area routes (except the default route). However. R3. and R4 in the network.0 subnets.3 area 21 Again. in the process of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been lost. 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. Once the issue has been resolved you should complete the task by configuring route summarization only to the remote office router R3. we must stop LSA Type 5 if we don’t want to send external routes.0. as well as the New York router so there is nothing that needs to be done on that router. You have corrected the fault when pings from R2 to the R3 LAN interface are successful.16. The remote office router (R3) was previously configured and all corporate subnets were reachable from R3.168.

Use the show running-config command on router R3.0.Correct Answer: Answer: Here are the solution as below: Section: [none] Explanation Explanation/Reference: Explanation: First we have to figure out why R3 and R4 can not communicate with each other. Notice that R3 is configured as a stub receive-only router.0 network. Next we will configure router R3 so that it has only 2 subnets of 10. This keyword will also prevent any type of route from being sent.0. The receive-only keyword will restrict the router from sharing any of its routes with any other router in that EIGRP autonomous system. Use the show ip route command on R3 to view its routing table: . Notice that the eigrp stub command equals to the eigrp stub connected summary because the connected and summary options are enabled by default. 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.

2.” QUESTION 23 ROUTE.0 255.0.0. This summarization is better because all the pings can work well. to make the routing table of R3 has only 2 subnets we have to summary other subnets into one subnet. Finally don’t forget to use the copy run start command on routers R3 and R4 to save the configurations.com is a small IT corporation that has an existing enterprise network that is running IPv6 0SPFv3. 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.255. R3(config-if)# end 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 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.2.0 255.0.0.0.255. Just for your information.0.0 255. R4> enable R4# conf t R4(config)# interface s0/0 R4(config-if)# ip summary-address eigrp 123 10. for example.0.2.2. R4's loopback address (FEC0:4:4) cannot be seen in R1's IPv6 routing table.0/16. We can’t get rid of it in the routing table no matter what technique we use to summary the networks.0. In the output if we don’t see the summary line (like 10.0/24. But in your real exam.0. if you don’t see the line "10.0/8 is a summary…) then we should use the command ip summary-address eigrp 123 10.0 at the interface s0/0 of R4 to summary.0.0.2.0.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. There is one interesting thing about the output of the show ip route shown above: the 10. .0.0/8 is a summary. However.2. Therefore. the s0/0 interface of R4.255.0 Now we jump back to R3 and use the show ip route command to verify the effect.255. Special Note: To gain the maximum number of points you must remove all incorrect or unneeded configuration statements related to this issue. Currently OSPF is configured on all routers. notice that if you use another network than 10. if you use the command ip summary-address eigrp 123 10. In conclusion.0 255.3. the output is shown below: 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.0.0 you will leave a /16 network in the output of the show ip route command. we will use the ip summary-address eigrp 123 10. Null0" then you can summarize using the network 10.0 so that all the ping can work well.0/8 to summary. which is a directly connected network of R3.

.

2. The area through which you configure the virtual link is known as a transit area. In some cases.2) + Configure virtual link on R3 (from the second output above. 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. too.3. the area 11 will become the transit area.3 Save the configuration: R2(config-rtr)#end R2#copy running-config startup-config (Notice that we have to use neighbor router-id 3.4. where this is not possible. not R2's router-id 2.4"): R3>enable R3#configure terminal R3(config)#ipv6 router ospf 1 R3(config-rtr)#no area 54 virtual-link 4. R4(config)#ipv6 router ospf 1 R4(config-router)#no area 54 virtual-link 3.2.4 R3(config-rtr)#area 11 virtual-link 2.4. + Configure virtual link on R2 (from the first output above.3.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).4.3 R4(config-router)#end After finishing the configuration doesn’t forget to ping between R1 and R4 to make sure they work. Make sure to remove the incorrect configuration statements to get the full points. Therefore.3.2.2 Save the configuration: R3(config-rtr)#end R3#copy running-config startup-config You should check the configuration of R4.3.2.3.4. we can use a virtual link to connect to the backbone through a non-backbone area. 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 3.3. routers R2 and R3 must be configured with the area <area id> virtuallink <neighbor router-id>command. In this case. .3.

ROUTE. routers R2 and R3 must be configured with the area <area id> virtuallink <neighbor router-id>command.3.com. If you want to check the routing information.4. If you want to check the routing information. a small IT company. All other traffic may use either link.4. QUESTION 24 You are a network engineer with ROUTE.2. In this case.4. where this is not possible.2. not R2's router-id 2. Pay more attention to the outputs of routers R2 and R3 The output of the "show running-config" command of R2: 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). too.3. one via a frame relay link and one via an EoMPLS link. use the show ipv6 route command. The area through which you configure the virtual link is known as a transit area. use the show ipv6 route command. we can use a virtual link to connect to the backbone through a non-backbone area. No static or default routing is allowed. Therefore.2. You may use the Test Workstation to generate HTTP traffic to validate your solution. the area 11 will become the transit area.3. Correct Answer: Answer: Here is the solution below: Section: [none] Explanation Explanation/Reference: Explanation: To troubleshoot the problem. not "show ip route". we learned that the OSPF process ID of R3 is 1 and we have to disable the wrong configuration of "area 54 virtual-link 4.2 Save the configuration: R3(config-rtr)#end R3#copy running-config startup-config You should check the configuration of R4.Note.4 R3(config-rtr)#area 11 virtual-link 2.4. 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 3.3. In some cases.3 Save the configuration: R2(config-rtr)#end R2#copy running-config startup-config (Notice that we have to use neighbor router-id 3. IT policy requires that all outbound HTTP traffic use the frame relay link when it is available. .com has two connections to the Internet.3.3 R4(config-router)#end After finishing the configuration doesn’t forget to ping between R1 and R4 to make sure they work. Make sure to remove the incorrect configuration statements to get the full points. + Configure virtual link on R2 (from the first output above.2) + Configure virtual link on R3 (from the second output above. Note. not "show ip route".3.3.2. Choose and configure the appropriate path selection feature to accomplish this task. first issue the show running-config on all of 4 routers. R4(config)#ipv6 router ospf 1 R4(config-router)#no area 54 virtual-link 3.4"): R3>enable R3#configure terminal R3(config)#ipv6 router ospf 1 R3(config-rtr)#no area 54 virtual-link 4.

100.16. The redundant paths from the OSPF network to the EIGRP network must be available in case of a link failure.100. a small IT company.1. One network is using OSPF as its IGP and the other is using EIGRP as its IGP. They have recently merged two organizations and now need to merge their networks as shown in the topology exhibit.2 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. R4 has been added to the existing OSPF network to provide the interconnect between the OSPF and EIGRP networks. All traffic must use the shortest path that provides the greatest bandwidth.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. Two links have been added that will provide redundancy. After that configure the route map and then apply it on the interface to the server in EIGRP network.1. 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. Section: [none] 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. QUESTION 25 You are a network engineer with ROUTE. No static or default routing is allowed in .com.

either network.
A previous network engineer has started the merger implementation and has successfully
assigned and verified all IP addressing and basic IGP routing. You have been tasked with
completing the implementation and ensuring that the network requirements are met. You may not
remove or change any of the configuration commands currently on any of the routers. You may
add new commands or change default values.

Correct Answer: Answer: First we need to find out 5 parameters (Bandwidth, Delay, Reliability, Load, MTU) of the s0/0/0 interface (the interface of R2 connected to
R4) for redistribution:
Section: [none]
Explanation
Explanation/Reference:

R2#show interface s0/0/0
Write down these 5 parameters, notice that we have to divide the Delay by 10 because the metric
unit is in tens of microsecond. For example, we get Bandwidth=1544 Kbit, Delay=20000 us,
Reliability=255, Load=1, 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, these parameters are just used for reference and we can use other parameters with
no problem.
If the delay is 20000us then we need to divide it by 10, 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, Delay=1000 us, Reliability=255, 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 172.16.100.1 network (the network behind
R4) in the routing table of R1 and make a ping from R1 to this network.
Note: If the link between R2 and R3 is FastEthernet link, we must put the command below under
EIGRP process to make traffic from R1 to go through R3 (R1 -> R2 -> R3 -> R4), which is
better than R1 -> R2 -> 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, 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.
Note: The actual OPSF and EIGRP process numbers may change in the actual exam so be sure
to use the actual correct values, but the overall solution is the same.

Question Set 1
QUESTION 1
A company has just opened two remote branch offices that need to be connected to the corporate network. Which interface configuration output can be applied to
the corporate router to allow communication to the remote sites?
A. interface Tunnel0
bandwidth 1536
ip address 209.165.200.230 255.255.255.224
tunnel source Serial0/0
tunnel mode gre multipoint
B. interface fa0/0
bandwidth 1536
ip address 209.165.200.230 255.255.255.224
tunnel mode gre multipoint
C. interface Tunnel0
bandwidth 1536
ip address 209.165.200.231 255.255.255.224
tunnel source 209.165.201.1
tunnel-mode dynamic
D. interface fa 0/0
bandwidth 1536
ip address 209.165.200.231 255.255.255.224
tunnel source 192.168.161.2
tunnel destination 209.165.201.1
tunnel-mode dynamic
Correct Answer: A
Section: [none]
Explanation
Explanation/Reference:
Explanation:
The configuration of mGRE allows a tunnel to have multiple destinations. The configuration of mGRE on one side of a tunnel does not have any relation to the
tunnel properties that might exist tunnel source Serial0/0
tunnel mode gre multipoint
B. interface fa0/0
bandwidth 1536
ip address 209.165.200.230 255.255.255.224
tunnel mode gre multipoint
C. interface Tunnel0
bandwidth 1536
ip address 209.165.200.231 255.255.255.224
tunnel source 209.165.201.1
tunnel-mode dynamic
D. interface fa 0/0
bandwidth 1536
ip address 209.165.200.231 255.255.255.224
tunnel source 192.168.161.2
tunnel destination 209.165.201.1
tunnel-mode dynamic
Answer: A
Explanation:
The configuration of mGRE allows a tunnel to have multiple destinations. 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. This means that an mGRE tunnel on the hub may connect to a p2p tunnel on the branch. Conversely, a p2p
GRE tunnel may connect to an mGRE tunnel. The distinguishing feature between an mGRE interface and a p2p GRE interface is the tunnel destination. An mGRE
interface does not have a configured destination. Instead the GRE tunnel is configured with the command tunnel mode gre multipoint. This command is used
instead of the tunnel destination x.x.x.x found with p2p GRE tunnels. Besides allowing for multiple destinations, an mGRE tunnel requires NHRP to resolve the
tunnel endpoints. Note, tunnel interfaces by default are point-to-point (p-p) using GRE encapsulation, effectively they have the tunnel mode gre command, which is
not seen in the configuration because it is the default.
The mGRE configuration is as follows:
!
interface Tunnel0
bandwidth 1536
ip address 10.62.1.10 255.255.255.0
tunnel source Serial0/0
tunnel mode gre multipoint
Reference:
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/DMVPDG/DMVP N_2_Phase2.html
QUESTION 2
A network engineer executes the show crypto ipsec sa command. Which three pieces of information are displayed in the output? (Choose three.)
A.
B.
C.
D.
E.
F.

inbound crypto map
remaining key lifetime
path MTU
tagged packets
untagged packets
invalid identity packets

Correct Answer: ABC
Section: [none]
Explanation
Explanation/Reference:
Explanation:
show crypto ipsec sa
This command shows IPsec SAs built between peers. The encrypted tunnel is built between 12.1.1.1 and 12.1.1.2 for traffic that goes between networks 20.1.1.0
and 10.1.1.0. You can see the two Encapsulating Security Payload (ESP) SAs built inbound and outbound. Authentication Header (AH) is not used since there are

no AH SAs.
This output shows an example of the show crypto ipsec sa command (bolded ones found in answers for this question).
interface: FastEthernet0
Crypto map tag: test, local addr. 12.1.1.1
local ident (addr/mask/prot/port): (20.1.1.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (10.1.1.0/255.255.255.0/0/0) current_peer: 12.1.1.2
PERMIT, flags={origin_is_acl,}
#pkts encaps: 7767918, #pkts encrypt: 7767918, #pkts digest 7767918 #pkts decaps: 7760382, #pkts decrypt: 7760382, #pkts verify 7760382 #pkts compressed:
0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0,
#pkts decompress failed: 0, #send errors 1, #recv errors 0 local crypto endpt.: 12.1.1.1, remote crypto endpt.: 12.1.1.2 path mtu 1500, media mtu 1500
current outbound spi: 3D3
inbound esp sas:
spi: 0x136A010F(325714191)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 3442, flow_id: 1443, crypto map: test sa timing: remaining key lifetime (k/sec): (4608000/52) IV size: 8 bytes
replay detection support: Y
inbound ah sas:
inbound pcp sas:
inbound pcp sas:
outbound esp sas:
spi: 0x3D3(979)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 3443, flow_id: 1444, crypto map: test sa timing: remaining key lifetime (k/sec): (4608000/52) IV size: 8 bytes
replay detection support: Y
outbound ah sas:
outbound pcp sas:
Reference: http://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike- protocols/5409-ipsec-debug-00.html
QUESTION 3
Refer to the following output:
Router#show ip nhrp detail
10.1.1.2/8 via 10.2.1.2, Tunnel1 created 00:00:12, expire 01:59:47 TypE. dynamic, Flags: authoritative unique nat registered used NBMA address: 10.12.1.2
What does the authoritative flag mean in regards to the NHRP information?
A.
B.
C.
D.
E.

It was obtained directly from the next-hop server.
Data packets are process switches for this mapping entry.
NHRP mapping is for networks that are local to this router.
The mapping entry was created in response to an NHRP registration request.
The NHRP mapping entry cannot be overwritten.

Correct Answer: A
Section: [none]
Explanation
Explanation/Reference:
Explanation:
Show NHRP: Examples
The following is sample output from the show ip nhrp command:
Router# show ip nhrp
10.0.0.2 255.255.255.255, tunnel 100 created 0:00:43 expire 1:59:16 Type: dynamic Flags: authoritative
NBMA address: 10.1111.1111.1111.1111.1111.1111.1111.1111.1111.11 10.0.0.1 255.255.255.255, Tunnel0 created 0:10:03 expire 1:49:56 Type: static Flags:
authoritative
NBMA address: 10.1.1.2
The fields in the sample display are as follows:
The IP address and its network mask in the IP-to-NBMA address cache. The mask is always 255.255.255.255 because Cisco does not support aggregation of
NBMA information through NHRP.
The interface type and number and how long ago it was created (hours:minutes:seconds).
The time in which the positive and negative authoritative NBMA address will expire (hours:minutes:seconds). This value is based on the ip nhrp holdtime
command.
Type of interface:
dynamic--NBMA address was obtained from the NHRP Request packet.
static--NBMA address was statically configured.
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.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html
QUESTION 4
Which common issue causes intermittent DMVPN tunnel flaps?
A.
B.
C.
D.

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: [none]
Explanation
Explanation/Reference:
Explanation:
DMVPN Tunnel Flaps Intermittently
Problem
DMVPN tunnel flaps intermittently.
Solution
When DMVPN tunnels flap, check the neighborship between the routers as issues with neighborship formation between routers may cause the DMVPN tunnel to
flap. In order to resolve this problem, make sure the neighborship between the routers is always up. Reference: http://www.cisco.com/c/en/us/support/docs/securityvpn/ipsec-negotiation-ike- protocols/29240-dcmvpn.html#Prblm1

book/evn-overview. C. E.) A. A single IP infrastructure can be virtualized to provide up to 32 virtual networks end-to-end.overview. NHRP. If the user satisfies the login and authentication. and Cisco Express Forwarding? A. Gigabit Ethernet. B. input a prescribed IP address. you cannot configure VRF-Lite on the same interface. DMVPN is initially configured to build out a hub-and-spoke network by statically configuring the hubs (VPN headends) on the spokes.1q encapsulation. the user is able to access company shares. C. After downloading. C.pdf QUESTION 6 Which three characteristics are shared by subinterfaces and associated EVNs? (Choose three. Using this initial hub-and-spoke network. This is accomplished as a result of each EVN having a unique routing and forwarding table. and port channels. it downloads the client that matches the operating system of the remote computer. Reference: http://www. and follow the instructions. The network engineer advises the user to open a web browser. Reference: http://www. D. users must enter the URL in the form https://<address>.cisco. B. 802.1Q ISL PPP Frame Relay MPLS HDLC Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Restrictions for EVN An EVN trunk is allowed on any interface that supports 802. GRE. E.com/c/en/us/td/docs/ios-xml/ios/evn/configuration/xe-3s/evn-xe-3s. B. Reference: http://www. NHRP and IPsec. dynamic routing protocol.pdf QUESTION 7 A user is having issues accessing file shares on a network. D. DMVPN is combination of the following technologies: . no change in the configuration on the hub is required to accept new spokes. To simplify the configuration process. IP address routing table forwarding table access control lists NetFlow configuration Correct Answer: ABC Section: [none] Explanation Explanation/Reference: Explanation: A trunk interface can carry traffic for multiple EVNs.QUESTION 5 Which encapsulation supports an interface that is configured for an EVN trunk? A.generation-firewalls/100936-asa8x-split-tunnel-anyconnect-config. tunnels between spokes can be dynamically built on demand (dynamic-mesh) without additional configuration on the hubs or spokes. D. such as Fast Ethernet. all the subinterfaces and associated EVNs have the same IP address assigned. C. remote users enter the IP address in their browser of an interface configured to accept SSL VPN connections. and the security appliance identifies the user as requiring the client. Unless the security appliance is configured to redirect http:// requests to https://. FlexVPN DMVPN GETVPN Cisco Easy VPN Correct Answer: B Section: [none] 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. the client installs and configures itself.com/en/US/docs/iosxml/ios/evn/configuration/xe-3sg/evn.cisco. EZVPN IPsec VPN client access VPDN client access SSL VPN client access Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: The Cisco AnyConnect VPN Client provides secure SSL connections to the security appliance for remote users. thereby enabling support for overlapping IP addresses across multiple EVNs. After entering the URL. establishes a secure SSL connection and either remains or uninstalls itself (depending on the security appliance configuration) when the connection terminates.com/c/en/us/support/docs/security/asa-5500-x-series-next. Without a previously installed client.cisco. the trunk interface is identified by the same IP address in different EVN contexts. B. This dynamic-mesh capability alleviates the need for any load on the hub to route data between the spoke networks. This DMVPN provides the capability for creating a dynamic-mesh VPN network without having to pre-configure (static) all possible tunnel end-point peers. F. D. Which type of remote access did the engineer enable? A. including IPsec (Internet Protocol Security) and ISAKMP (Internet Security Association and Key Management Protocol) peers. the browser connects to that interface and displays the login screen.html QUESTION 8 Which Cisco IOS VPN technology leverages IPsec. OSPFv3 is not supported. If an EVN trunk is configured on an interface. OSPFv2 is supported. After doing this. mGRE. In other words.

BGP) Dynamic IPsec encryption Cisco Express Forwarding (CEF) Reference: http://en. RIP.org/wiki/Dynamic_Multipoint_Virtual_Private_Network .Multipoint GRE (mGRE) Next-Hop Resolution Protocol (NHRP) Dynamic Routing Protocol (EIGRP.wikipedia. OSPF.

You can disable the IP route cache globally. Unfortunately. which method can you use in combination with the "debug ip packet" command to limit the amount of output data? A.Question Set 1 QUESTION 1 Which traffic does the following configuration allow? ipv6 access-list cisco permit ipv6 host 2001:DB8:0:4::32 any eq ssh line vty 0 4 ipv6 access-class cisco in A. B. You can use the RITE traffic exporter.com/web/about/security/intelligence/acl-logging. Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: The debug ip packet command generates a substantial amount of output and uses a substantial amount of system resources. You can use an IOS parser. Reference: http://www.dmvpn/111976-dmvpn-troubleshoot-00. D. A packet that matches access-list with the "log" keyword is Cisco Express Forwarding switched. Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: Logging-enabled access control lists (ACLs) provide insight into traffic as it traverses the network or is dropped by network devices. source address destination address router interface default gateway Correct Answer: A Section: [none] 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.com/en/US/docs/ios/12_2/security/configuration/guide/scfrpf. D. IPv6 access list has just one entry. C. its customer. This command should be used with caution in production networks. You can use an extended access list. Reference: http://www. C. B. can take advantage of forged or rapidly changing source IP addresses to allow attackers to thwart efforts to locate or filter the attacks. This action protects the network of the ISP. C. including Smurf and Tribal Flood Network (TFN).html#4 QUESTION 4 Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet against the routing table? A.com/c/en/us/ support/docs/security/dynamic-multipoint-vpn. access-list 100 permit ip any any log After applying the access list on a Cisco router. 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. C. E. A large amount of IP traffic is being permitted on the router.cisco. A packet that matches access-list with the "log" keyword is process switched.cisco. QUESTION 2 For troubleshooting purposes. the network engineer notices that the router CPU utilization has risen to 99 percent. B. A packet that matches access-list with the "log" keyword is fast switched. ACL logging can be CPU intensive and can negatively affect other functions of the network device. Always use with the access-list command to apply an extended ACL to the debug output. You can use the KRON scheduler.html QUESTION 5 What are the three modes of Unicast Reverse Path Forwarding? . Unicast RPF deflects such attacks by forwarding only packets that have source addresses that are valid and consistent with the IP routing table. which allows only the single IPv6 IP address of 2001:DB8:0:4::32 to connect using SSH only. a number of common types of denial-of-service (DoS) attacks.cisco. B. D. For Internet service providers (ISPs) that provide public access. Reference: http://www. and the rest of the Internet. D.html QUESTION 3 Refer to the following access list. 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: [none] Explanation Explanation/Reference: Explanation: Here we see that the IPv6 access list called "cisco" is being applied to incoming VTY connections to the router. For example. What is the reason for this? A.

14.14.0-10. use the no form of this command. An access list may also be specified that permits or denies certain source addresses in Unicast RPF loose mode. Unicast RPF loose mode is a scalable option for networks that contain asymmetric routing paths.0. C.14. the packet is discarded.0.168. 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. router(config-if)#ip helper-address 172.192.31. accomplish? router(config)#access-list 101 deny ip 10. Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: The private IP address ranges defined in RFC 1918 are as follows: 10. It prevents incoming traffic from IP address ranges 10. Reference: http://www.225 69 53 49 Correct Answer: A Section: [none] Explanation .0 0. The log keyword also enables logging of this intrusion attempt. It prevents the internal network from being used in spoofed denial of service attacks and logs any exit to the Internet. Unicast RPF in VRF mode will not be covered in this document. Unicast RPF works in one of three different modes: strict mode. Reference: http://www.225 router(config-if)#ip helper-address 172.31. B.16.255.0.15. use the ip http secure-port command in global configuration mode. and VRF mode Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit the malicious traffic on an enterprise network.0 0. loose mode. or VRF mode. Which command should be applied to the configuration to allow this? A.255. ip http secure-port port-number no ip http secure-port Syntax Description port. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network. 53. B.0.20.172.255 192.0.255. and 49 to 172. QUESTION 7 Refer to the following command: router(config)# ip http secure-port 4433 Which statement is true? A. broadcast mode. When administrators use Unicast RPF in strict mode.255. loose mode.com/web/about/security/intelligence/unicast-rpf. D.0.0.255. strict mode.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.0 0.0.0 . Additionally. C. and broadcast mode strict mode.0.10.14. B. which is applied on the external interface FastEthernet 1/0 of the perimeter router. 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. When administrators use Unicast RPF in loose mode. D.sh.255.html#wp3612805529 QUESTION 8 A network engineer is configuring a routed interface to forward broadcasts of UDP 69. To return the HTTPS server port number to the default. Administrators can change this behavior using the allow-default option.16.168. the packet must be received on the interface that the router would use to forward the return packet. loose mode. Although asymmetric traffic flows may be of concern when deploying this feature.cisco.255. This security feature works by enabling a router to verify the reachability of the source address in packets being forwarded. If the source IP address is not valid.0. The router will never accept any HTTP and HTTPS traffic. It prevents private internal addresses to be accessed directly from outside.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.172.0.225.225 router(config-if)#ip udp helper-address 172. It filters incoming traffic from private addresses in order to prevent spoofing and logs any intrusion attempts. The router will listen on port 4433 for HTTP traffic.0. 192. The router will listen to HTTP and HTTP traffic on port 4433. This capability can limit the appearance of spoofed addresses on a network.255.20. The default is 443. the source address must appear in the routing table. C.com/en/US/docs/ios-xml/ios/https/command/nm-https-cr-cl.255. but the port number must be number higher than 1024 unless the default is used.cisco.A.255 any log router (config) #access-list 101 deny ip 172.0 .168.255 and logs any intrusion attempts.225 router(config-if)#udp helper-address 172. and VRF mode strict mode. Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: To set the secure HTTP (HTTPS) server port number for listening.255 any log router (config)#access-list 101 deny ip 192.html QUESTION 6 What does the following access list. D.0.14.255. C. and VRF mode broadcast mode.0-192. loose mode.20.0. B.20. The router will listen on port 4433 for HTTPS traffic.168. D.0. This ACL is used to prevent all packets with a spoofed reserved private source IP address to enter the network. a packet that contains a source address for which the return route points to the Null 0 interface will be dropped.0 .0. which allows the use of the default route in the source verification process.Integer in the range of 0 to 65535 is accepted.16. 172. Note that not all network devices support all three modes of operation.255.255.255 172.20.168.

UDP port 69 Domain Name System (DNS) UDP port 53 Time service .html . The broadcasts will be forwarded to the unicast address which is specified with the ip helper command.port 37 NetBIOS Name Server .port 67 TACACS UDP port 49 Reference: http://www.cisco-faq.port 138 Bootstrap Protocol (BOOTP) . ip helper-address {ip address} When configuring the ip helper-address command. the following broadcast packets will be forwarded by the router by default: TFTP .port 137 NetBIOS Datagram Server .Explanation/Reference: Explanation: To let a router forward broadcast packet the command ip helper-address can be used.com/163/forward_udp_broadcas.

) A. Disable event logging on all noncritical items. 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) . Most companies have decided that the information being transmitted isn't valuable enough to be worth the extra effort in upgrading to SNMPv3. E.Question Set 1 QUESTION 1 A network engineer is configuring SNMP on network devices to utilize one-way SNMP notifications. E. and warning levels).28 traps version 3 auth CISCORO router(config)#snmp-server host 172. "AuthNoPriv" (messages are authenticated but not encrypted auth keyword in CLI). SNMP version 2 uses community strings (think cleartext passwords. Correct Answer: AB Section: [none] Explanation Explanation/Reference: Explanation: The optional msec keyword specifies the date/time format should include milliseconds. "AuthPriv" (messages are authenticated and encrypted priv keyword in CLI). D." By increasing the severity level. B. Set the logging severity level to 1. Core dumps are generally very useful to your technical support representative. error. use the logging history command in global configuration mode. SNMP version 3 moves away from the community string approach in favor of user. more granular monitoring can occur. C. router(config)#snmp-server host 172. Increase the logging history . Specify a logging rate limit. which determines the access policy for its users.com/snmp-version-3/ QUESTION 2 When using SNMPv3 with NoAuthNoPriv. SNMPv2. username serves as a replacement for community string). The view is used to define what the user account may access on the IOS device. but I would suggest otherwise. Finally. Reference: http://www. Use the msec option to enable service time stamps. no encryption) to authenticate polling and trap delivery. senior management asks you to implement better logging functionality on all IOS-based devices. B. it is sometimes useful to obtain a full copy of the memory image (called a core dump) to identify the cause of the crash.ccnpguide.201. The SNMPv3 implementations could be configured to use either of the models on per-group basis (in case if "noAuthNoPriv" is configured.16. C.based authentication and view-based access control. and SNMP messages will be sent by the less sever (5-7) messages. Users. Which two actions can you take to provide enhanced logging results? (Choose two.com/2008/07/19/snmpv3-tutorial/ QUESTION 3 After a recent DoS attack on a network. B. D. which string is matched for authentication? A. alert. in other words. However. The following security levels exits: "noAuthNoPriv" (no authentiation and no encryption noauth keyword in CLI).201. SNMPv3. Cisco devices Log error messages of severity levels 0 through 4 (emergency. The problem of course is that the SNMP statistical payload is not encrypted and authentication is passed in cleartext. The users are not actual local user accounts. views. critical. In this situation. D. each user is added to a group. "saving level warnings or higher.28 informs version 3 auth CISCORO Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Most network admins and engineers are familiar with SNMPv2c which has become the dominant SNMP version of the past decade. rather they are simply a means to determine who can authenticate to the device.16.28 informs version 2c CISCORO router(config)#snmp-server host 172. Which command satisfies the requirements of this scenario? A. there are some major changes under the hood. SNMPv1 and SNMPv2 models only support the "noAuthNoPriv" model since they use plain community string to match the incoming packets. B. By default. username password community-string encryption-key Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: The following security models exist: SNMPv1.16. It's simple to configure on both the router/switch-side and just as easy on the network monitoring server.28 traps version 2c CISCORO router(config)#snmp-server host 172.16. the engineer is not concerned with authentication or encryption.ine. This can aid in pinpointing the exact time of events. C. which feature can the engineer use to create a crash collection? A. D. Reference: http://blog. C.201. or to correlate the order that the events happened. Like IPv4 to IPv6. groups. To limit syslog messages sent to the router's history table and to an SNMP network management station based on severity. QUESTION 4 A network engineer finds that a core router has crashed without warning. secure copy protocol core dumps warm reloads SNMP NetFlow Correct Answer: B Section: [none] Explanation Explanation/Reference: Explanation: When a router crashes.201.

RFC 6146).known TCP port is used. It enables a device to be an NTP peer to another device. When you use the ntp broadcast client command.html . To avoid as many of the issues associated with NAPT44 as possible. C. The operation is scheduled to start immediately.html QUESTION 5 A network engineer is trying to implement broadcast-based NTP in a network and executes the ntp broadcast client command. NPTv6 is defined to include a two-way.cisco. B. Reference: http://www. B. B. C. It rewrites transport layer headers. see RFC 6052.wikipedia. It is checksum-neutral. It enables a device to receive NTP broadcast and unicast packets. Command Description ntp broadcast Allows the system to receive NTP broadcast packets on an client interface. there is no need to send the control message. and nothing else. D. Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: The NTP service can be activated by entering any ntp command. 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. The address-independence benefit stems directly from the translation function of the network prefix translator. C.mt-book/ sla_tcp_conn. In this example. because the target is not a Cisco device and a well. In this example. Reference: http://tools.Using remote copy protocol (rcp) Using a Flash disk Reference: http://www.1).0. algorithmic translation function.0. designed to provide address independence to the edge network. C. 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. Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: RFC 6296 describes a stateless IPv6-to-IPv6 Network Prefix Translation (NPTv6) function. Assuming that an NTP server is already set up.cisco. D. It enables receiving NTP broadcasts on all interfaces globally.1 port 23 Reference: http://www. The NAT64 server then creates a NAT-mapping between the IPv6 and the IPv4 address. Reference: http://en. such as SCTP. but not to the servers. checksum-neutral. connectionless-oriented service-oriented connection-oriented application-oriented Correct Answer: C Section: [none] 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. Which type of statistics does the engineer see? A. It enables receiving NTP broadcasts on the interface where the command was executed. E. It maintains a per-node state. 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.cr-book/bsm-xe-3se-3850-cr-book_chapter_00. The IPv6 client embeds the IPv4 address it wishes to communicate with using these bits. It is transport-agnostic with respect to transports that do not checksum the IP header.cisco. IP SLAs uses the control protocol to notify the IP SLAs responder to enable the target port temporarily.0.com/c/en/us/td/docs/ios-xml/ios/bsm/command/bsm-xe-3se-3850. This action allows the responder to reply to the TCP Connect operation.org/wiki/NAT64 QUESTION 8 A network engineer initiates the ip sla responder tcp-connect command in order to gather statistics for performance gauging. It interferes with encryption of the full IP payload. the control protocol is disabled on the source (Device B). and sends its packets to the resulting address. as shown in the "TCP Connect Operation" figure in the "Information About the IP SLAs TCP Connect Operation" section.ietf. allowing them to communicate. what is the result of the command? A.0.org/html/rfc6296 QUESTION 7 IPv6 has just been deployed to all of the hosts within a network. NAT NATng NAT64 dual-stack NAT DNS64 Correct Answer: C Section: [none] Explanation Explanation/Reference: Explanation: NAT64 is a mechanism to allow IPv6 hosts to communicate with IPv4 servers. Device A (target device) Configuration configure terminal ip sla responder tcp-connect ipaddress 10.com/en/US/docs/internetworking/troubleshooting/guide/tr19aa. D. D.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15. Which feature allows IPv6 devices to communicate with IPv4 servers? A.html QUESTION 6 What is a function of NPTv6? A. B.

IP address 10. Enter your password if prompted. D.1. 0 flows failed due to lack of No memory was available to create an export export packet packet.1 Specifies the export destinations and ports. enable 2. 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. Example: Device# configure terminal Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device. IPv6 PMTU is enabled on the router.3.1 The ports are in parentheses. Flow-set marking in 1280-byte or larger packets is enabled.com/c/en/us/td/docs/ios/12_0s/feature/guide/oaggnf.QUESTION 9 A network engineer executes the "ipv6 flowset" command. ipv6 flowset 4. drops Reference: http://www. possibly because another feature requires running on the packet. 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.cisco. configure terminal 3. One of the last things that the engineer does is to configure an access list (access-list 1 permit any) along with the command ip nat inside source list 1 int s0/0 overload. output drops enqueuing for the RP fragmentation failures adjacency issues Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: Table 5 show ip flow export Field Descriptions Field Description Exporting flows to 10. IPv6 flow control is enabled on the router.1. SUMMARY STEPS 1. Which line in the output indicates that the send queue is full and export packets are not being sent? A.html QUESTION 10 A network engineer executes the show ip flow export command. and datagrams the total number of flows contained within them. Flow-label marking in 1280-byte or larger packets is enabled. 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.mt/ip6b-15-mt-book/ip6-mtu-path-disc. D.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. 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. 11 flows exported in 8 udp The total number of export packets sent. What is the result? A. Which functions do the two commands serve in this scenario? . C. Example: Device> enable Step 2 configure terminal Enters global configuration mode. (1000) and 10.2. 0 export packets were sent The packet could not be processed by CEF or up to process level by fast switching. Example: Device(config)# ipv6 flowset Reference: http://www. B.cisco. C. Exporting using source Specifies the source address or interface.html QUESTION 11 A network engineer is asked to configure a "site-to-site" IPsec VPN tunnel. Correct Answer: A Section: [none] 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.1. clear ipv6 mtu DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC mode.1. exit 5.

Which action will allow for manual switching of HSRP nodes? A.255. The command ip nat 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.10.10. Loopback interfaces can be tracked. Which feature should the engineer use to gather the required information? A.10.Translations are overloaded.0 0.16. SNMP Cisco IOS EEM NetFlow Syslog .1.translated to an address out of the NAT pool named ovrld.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77. The command ip nat 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. B.20.20.255. and bandwidth-intensive applications are identified as the root cause. C.Indicates that any packets received on the inside interface that !--. which allows multiple inside !--. Track the up/down state of a loopback interface and shut down this interface during maintenance. If the line protocol of the specified interface goes down. The command access-list 1 permit any defines only one machine that is allowed through the tunnel.com/c/en/us/support/docs/ip/hot-standby-router-protocol.A.are permitted by access-list 7 has the source address !--.0 0.16.255.10. access-list 7 permit 10. ip nat inside source list 7 pool ovrld overload ! ! ! ! !--.Defines Ethernet 0 with an IP address and as a NAT inside interface.10.16. the NAT pool "ovrld"only has a range of one address.10.0.Defines Ethernet 1 with an IP address and as a NAT inside interface.31.devices to be translated to the same valid IP address. the HSRP priority is reduced.16.0.255.0 ip nat outside !--.10. The keyword overload used in the ip nat inside source list 7 pool ovrld overload command allows NAT to translate multiple inside devices to the single address in the pool.10.html QUESTION 13 A network engineer is notified that several employees are experiencing network performance related issues. interface serial 0 ip address 172.64 255. Note in the previous second configuration. 172. D.hsrp/13780-6. Enable HSRPv2 under global configuration.20.10. Disable and enable all active interfaces on the active HSRP node. This means that another HSRP router with higher priority can become the active router if that router has standby preempt enabled.10.255.cisco.20.1 prefix 24 ! !--. Correct Answer: A Section: [none] 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.0. C.1 255. Adjust the HSRP priority without the use of preemption.Access-list 7 permits packets with source addresses ranging from !--. The command access-list 1 defines interesting traffic that is allowed through the tunnel. D. 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. ip nat pool ovrld 172.Defines serial 0 with an IP address and as a NAT outside interface.0 ip nat inside !--. Correct Answer: D Section: [none] Explanation Explanation/Reference: Explanation: Configuring NAT to Allow Internal Users to Access the Internet Using Overloading NAT Router interface ethernet 0 ip address 10. D.10.10.10. interface ethernet 1 ip address 10.31 and 10.1 255. Reference: http://www.255.10.Defines a NAT pool named ovrld with a range of a single IP !--. as an alternative to powering down the active router and letting the network respond accordingly.10. Reference: http://www.0 through 10. information such as the source/destination IP and Layer 4 port numbers is required.shtml QUESTION 12 A network engineer is configuring a solution to allow failover of HSRP nodes during maintenance windows.0 ip nat inside !--.10. !--. B.cisco.1 172.31 !--. B.0 through 10.10. which allows for maintenance mode.0.address. In order to identify which specific type of traffic is causing this slowness. C.31 access-list 7 permit 10.

cisco. When enabled. What is switching? A Router must make decisions about where to forward the packets passing through. If the destination is reachable. the network engineer is unable to see OUT traffic on the interfaces. Based on the routing table. The command ip flow-capture fragment-offset has been enabled. Example: Device# show flow exporter FLOW_EXPORTER-1 Reference: http://www. 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. Switching is what a router does when it makes the following decisions: 1. D. Better performance than fast-switching (the default) and takes less CPU to perform the same task. Overall.html QUESTION 16 . The following command is entered: switch#show flow exporter Flow_Exporter-1 What is the expected output? A. 2. Router# config t Router(config)# ip cef Router(config)# To disable CEF. NetFlow output has been filtered by default. 2.manageengine.data-expt.com/network-2/netflowanalyzer/2010/05/19/need-for-cef. Cisco Express Forwarding has not been configured globally. 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.html QUESTION 15 A network engineer has left a NetFlow capture enabled over the weekend to gather information regarding excessive bandwidth utilization. ie. Whether to forward or not forward the packets after checking that the destination for the packet is reachable. This decision-making process is called "switching". This is why this topic is about Cisco Express Forwarding. That is when we noticed the `no ip cef' command on the router. The FIB is organized differently than the routing table and CEF uses the FIB to decide which interface to send traffic from. After reviewing the output of NetFlow. 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.in-netflow-data-export. CEF offers the following benefits: 1. the NetFlow packets did not mark the destination interfaces and so NetFlow Analyzer was not able to show the OUT traffic for the interfaces. Why CEF Needed when enabling NetFlow ? CEF is a prerequisite to enable NetFlow on the router interfaces.cisco. Without enabling the CEF on the router.com/en/US/docs/ios-xml/ios/netflow/configuration/12-4t/cfg-nflow. CEF decides through which interface traffic is exiting the router. What is CEF? CEF is one of the available switching options for Cisco routers. C. To enable CEF. B. go into global configuration mode and enter the CEF command. CEF was enabled at the global level and within seconds. Specifically. NetFlow Analyzer started showing OUT traffic for the interfaces.html QUESTION 14 An organization decides to implement NetFlow on its network to monitor the fluctuation of traffic that is disrupting core services. 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. Flow Export version 9 is in use. allows for advanced features like NBAR 3. Reference: https://blogs. Enabling and Disabling CEF is easy. CEF creates its own table. simply use the `no' form of the command.fnflow-exprts. D. What can you determine based on this information? A. `no ip cef`.E. B. Every NetFlow configuration aspect was checked and nothing incorrect was found. called the Forwarding Information Base (FIB). Correct Answer: A Section: [none] 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/fnetflow/configuration/15-mt/cfg-de. 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: [none] Explanation Explanation/Reference: Explanation: show flow exporter exporter-name (Optional) Displays the current status of the specified flow exporter. C. what is the next hop of the router and which interface will the router use to get to that destination. WCCP Correct Answer: C Section: [none] 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. If the CEF is disabled on the router.

D. flow monitor flow exporter flow sampler flow collector Correct Answer: A Section: [none] Explanation . B. The translation mechanism is stateless and provides a 1:1 relationship between the internal addresses and external addresses. This solution allows both enterprises and ISPs to accelerate IPv6 adoption while simultaneously handling IPv4 address depletion. an access. which is essential to the superiority of NAT64 over NAT-PT. G. B. C.html QUESTION 19 Which NetFlow component is applied to an interface and collects information about flows? A.com/c/dam/en/us/td/docs/solutions/SBA/August2012/Cisco_SBA_BN_IPv6Ad dressingGuide-Aug2012. or an edge network). D. B. Table 2. or NAT64.) A.cisco.pdf QUESTION 17 Which two functions are completely independent when implementing NAT64 over NAT-PT? (Choose two. C. SLAAC Reference: http://www.cisco. hence transparency and scalability lacks in end-to-end address transparency 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. multi homing. and IPv6 to IPv6 translations at the Internet edge are performed. E. B. D. Manual. The following table provides a high-level overview of the most relevant differences. DNS NAT port redirection stateless translation session handling Correct Answer: AB Section: [none] Explanation Explanation/Reference: Explanation: Network Address Translation IPv6 to IPv4.solution/white_paper_c11-676278.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6. C. and redundancy and load sharing. hosts DHCPv6. there are important differences. D.html QUESTION 18 Which two methods of deployment can you use when implementing NAT64? (Choose two. technology facilitates communication between IPv6-only and IPv4-only hosts and networks (whether in a transit. E.cisco. Reference: http:// www.solution/white_paper_c11-676277. The use cases for NPTv6 outlined in the RFC include peering with partner networks. NAT64 NAT44 NATv6 NPTv4 NPTv6 Correct Answer: E Section: [none] Explanation Explanation/Reference: Explanation: NPTv6 provides a mechanism to translate the private internal organization prefixes to public globally reachable addresses.) A. stateless stateful manual automatic static functional dynamic Correct Answer: AB Section: [none] Explanation Explanation/Reference: Explanation: While stateful and stateless NAT64 perform the task of translating IPv4 packets into IPv6 packets and vice versa. E.A company's corporate policy has been updated to require that stateless.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6. The DNS64 and NAT64 functions are completely separated. What is the best solution to ensure compliance with this new policy? A. F. 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. C. Reference: http://www. 1-to-1.

The sampler matched 10 packets. each one randomly chosen from every 100-second interval. The sampler matched 10 packets.10.cisco. 199th.10. C.cisco.10. udp-port UDP protocol-specific port number.1 5858? A. 302nd. Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: To enable the exporting of information in NetFlow cache entries.html#wp1084291 QUESTION 21 What is the result of the command ip flow-export destination 10. The flow monitor cache is automatically created at the time the flow monitor is applied to the first interface.cisco.com/c/en/us/td/docs/ios/fnetflow/command/reference/fnf_book/fnf_01. and so on packets. which is configured for the flow monitor and stored in the flow monitor cache. Flow data is collected from the network traffic during the monitoring process based on the key and nonkey fields in the record. C. For example. In the random sampling mode that Random Sampled NetFlow uses. incoming packets are randomly selected so that one out of each n sequential packets is selected on average for NetFlow processing. Flow monitors consist of a record and a cache.com/c/en/us/td/docs/ios/12_0s/feature/guide/nfstatsa.1 on port UDP/5858.1 and port UDP/5858. It configures the router to receive cache flow information from IP 10.10. each packet randomly chosen from every group of 100 packets. The n value is a parameter from 1 to 65535 packets that you can configure.10.10.Explanation/Reference: Explanation: Flow monitors are the NetFlow component that is applied to interfaces to perform network traffic monitoring.10.html#wp1023091 . This sample configuration provides NetFlow data on 1 percent of total traffic.10. It configures the router to export cache flow information to IP 10. one packet every 100 packets. 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. then NetFlow might sample the 5th. The sampler matched 10 packets. The sampler matched 10 packets. Reference: http://www. B.10. It configures the router to export cache flow information about flows with destination IP 10. B.10.IP address of the workstation to which you want to send the address NetFlow information. Syntax Description ip. D.com/c/en/us/td/docs/ios/12_0s/feature/guide/12s_mdnf.1 and port UDP/5858. You add the record to the flow monitor after you create the flow monitor. D. 120th. Which statement about the output of the show flow-sampler command is true? A. one packet every 100 seconds.1 on port UDP/5858. if you set the sampling rate to 1 out of 100 packets. use the ip flow-export destination command in global configuration mode.html#w p1314030 QUESTION 20 Refer to the exhibit. Reference: http://www. Correct Answer: A Section: [none] Explanation Explanation/Reference: Explanation: The sampling mode determines the algorithm that selects a subset of traffic for NetFlow processing. It configures the router to receive cache flow information about flows with destination IP 10.