Accessing the WAN - Chapter 3

1 Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service? Customerscandefinetheirvirtual circuit needs in far greatercombinations, withincrements as small as 64 kbps. Customerspay for an end-to-end connectionthatincludes the local loop and the network link. Customersonlypay for the local loop and the bandwidththeypurchasefrom the network provider. Connecting new sites requires new lowercost circuit installations whencompared to ISDN dialupcosts or addingadditional hardware for leased service. Observable Description Max Value 1 correctness of response 2 points for Option 3 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.1.1 Introducing Frame Relay 2 Whattwomethodsdoes Frame Relay technology use to process frames thatcontainerrors? (Choosetwo.) Frame Relay services depend on the upper layer protocols to handleerrorrecovery. It requires the receivingdevice to requestthat the sender retransmit erroneous frames. FECN, BECN, and DE bits are set in the frames to minimizeerrors. The receivingdevice drops any frames thatcontainerrorswithoutnotifying the sender. The frame relayswitch notifies the senderthaterrorsweredetected. Observable Description Max Value 1 correctness of response Option 1 and Option 4 are correct. 1 point for each correct option.

0 points if more options are selectedthanrequired. 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.1.3 Frame Relay Encapsulation 3 What best describes the use of a data-linkconnection identifier (DLCI)? local addressidentifying a destination router across a Frame Relay network locallysignificantaddressused to identify a virtual circuit logicaladdressidentifying the interface between a router and a Frame Relay switch logicaladdressused to identify the DCE Observable Description Max Value 1 correctness of response 2 points for Option 2 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.1.2 Virtual Circuits 4 WhatiscreatedbetweentwoDTEs in a Frame Relay network? ISDN circuit limitedaccess circuit switchedparallel circuit virtual circuit Observable Description Max Value 1 correctness of response 2 points for Option 4 0 points for anyother option 2

This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.1.2 Virtual Circuits 5 Whichtwo items allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? (Choosetwo.) ARP RARP Proxy ARP Inverse ARP LMI status messages ICMP Observable Description Max Value 1 correctness of response Option 4 and Option 5 are correct. 1 point for each correct option. 0 points if more options are selectedthanrequired. 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.1.5 Frame Relay AddressMapping 6

Refer to the exhibit. A pingis sent to address 192.168.50.10 from the Peanut router. Which DLCI willbeused to send the ping? 110 115 220 225 Observable Description Max Value 1 correctness of response 2 points for Option 1 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.1.5 Frame Relay AddressMapping 7

Refer to the exhibit. Whateffectdoes the point-to-point configuration on subinterface S0/0.110 have on the operation of the router? It helps to conserve IP addresses. It establishes multiple PVC connections to multiple physical interfaces. It eliminates split horizon issues withoutincreasing the likelihood of routingloops. It requires the configuration of the encapsulation command on the subinterface. Observable Description Max Value 1 correctness of response 2 points for Option 3 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN

* 3.4.1 Configuring Frame Relay Subinterfaces 8 Whichthree actions might a Frame Relay switchperformwhenitdetects an excessive build-up of frames in its queue? (Choosethree.) puts a hold on accepting frames in excess of the CIR drops frames from the queue that have the DE bit set reduces the number of frames itsends over the link re-negotiates flow control with the connecteddevice sets the FECN bit on all frames itreceives on the congestedlink sets the BECN bit on all frames it places on the congestedlink Observable Description Max Value 1 correctness of response Option 2, Option 5, and Option 6 are correct. 1 point for each correct option. 0 points if more options are selectedthanrequired. 3 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.3.3 Frame Relay Flow Control 9

Refer to the exhibit. Whichtwostatements are truegiven the output shown? (Choosetwo.) The IP address of the local Frame Relay interface is 172.16.1.4. The local DLCI numberis 401. Inverse ARP isbeingused on thisconnection. This interface is in the active state and in the process of negotiating configuration

parameters. Multicast is not enabled on thisconnection. Observable Description Max Value 1 correctness of response Option 2 and Option 3 are correct. 1 point for each correct option. 0 points if more options are selectedthanrequired. 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.4.2 Verifying Frame Relay Operation 10 Which Frame Relay topologyis a compromise of costs, reliability, and complexitywhen the WAN contains one headquarters site, 40 regional sites, and several sites withineachregional site? star full mesh partial mesh point-to-multipoint point-to-point Observable Description Max Value 1 correctness of response 2 points for Option 3 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.4.1 Configuring Frame Relay Subinterfaces 11

Refer to the exhibit. Whatcanbedetermined about the Frame Relay switchfrom the output shown? It iscurrently not transmitting data. It is in the process of establishing the PVC. It has put a hold on processing frames in excess of the CIR. It isexperiencing congestion. Observable Description Max Value 1 correctness of response 2 points for Option 4 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.4.2 Verifying Frame Relay Operation 12

Refer to the exhibit. Frame Relay connectivity has be en configured in the network and OSPF isused as the routingprotocol. Router R1 cansuccessfullyping the router R2 serial interface. When R1 attempts to ping network 192.168.3.0/24 the pingfails. Whatadditional configuration shouldbeapplied on all routers to remedy the problem? Add the broadcast keyword in the Frame Relay map command on bothrouters. Issue the frame-relay interface-dlci command in addition to the frame -relaymap

command on both router interfaces. Remove the frame-relaymap command and replace with the frame-relay interfacedlci command on both router interfaces. Apply the no frame-relay inverse-arp command on both router interfaces. Observable Description Max Value 1 correctness of response 2 points for Option 1 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.2.2 ConfiguringStatic Frame Relay Maps 13 Whichstatement about Frame Relay subinterfacesis correct? Multipoint interfaces willautomaticallyforwardroutingbroadcasts but will consume more IP addressesthan point-to-point subinterfaceswill consume. Point-to-point subinterfacesactlikeleasedlines and eliminate split-horizon routingissues. Interfaces with multiple PVCsrequireaseparatesubinterface for each PVC. Multipoint configurations cannot use subinterfaces. Observable Description Max Value 1 correctness of response 2 points for Option 2 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.3.1 SolvingReachability Issues 14

Refer to the exhibit. You are a network administratorwho has been taskedwithcompleting the Frame Relay topologythatinterconnectstworemote sites. Router HQ belongs to both the 172.16.1.0/24 and 172.16.2.0/24 subnetswith IP addresses of 172.16.1.3 and 172.16.2.3 respectively. Trafficbetween R1 and R2 must travelthrough HQ first. How should the serial interface on HQ beconfigured to complete the topology? one multipoint subinterface two point-to-point subinterfaces with the physical interface configuredwithtwoipaddresses one IP address on a point-to-point subinterface and one IP address on the physical interface Observable Description Max Value 1 correctness of response 2 points for Option 2 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.4.1 Configuring Frame Relay Subinterfaces 15 Whatconsideration must betakenintoaccount if RIP isused on Frame Relay multiaccess networks? To forwardrouting updates, address-to-DLCI mapping must bedone via the use of the frame-relaymap command coupledwith the broadcast keyword. Inverse ARP must beenabled to turnrouting update broadcastsinto unicast trafficthatcanbepropagated to other Frame Relay nodes. Becausebroadcasttrafficis not supported, RIPv1 cannotbeimplemented on Frame Relay networks. To forwardbroadcastrouting updates, dynamicmapping must beenabled. Observable Description Max Value

1 correctness of response 2 points for Option 1 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.2.2 ConfiguringStatic Frame Relay Maps 16

Refer to the exhibit. Whichstatementexplainswhy the Frame Relay connectionbetween R1 and R2 isfailing? Split horizon must bedisabled. The LMI type must bespecified. Logicalsubinterfaces must beusedinstead. The frame-relaymapcommands are using incorrect DLCIs. Observable Description Max Value 1 correctness of response 2 points for Option 4 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.2.2 ConfiguringStatic Frame Relay Maps 17

Refer to the exhibit. Router R1 has been configured for Frame Relay connectivity to routers R2 and R3. Which set of configuration options for routers R2 and R3 wouldprovideeach router connectivity to R1? R2(config)# interface serial0/0/1

R2(config-if)# frame-relaymapip 10.1.1.1 102 R3(config)# interface serial0/0/1 R3(config-if)# frame-relaymapip 10.1.2.1 103 R2(config)# interface serial0/0/1 R2(config-if)# frame-relaymapip 10.1.1.1 102 R2(config-if)# frame-relaymapip 10.1.2.3 301 R3(config)# interface serial0/0/1 R3(config-if)# frame-relaymapip 10.1.2.1 103 R3(config-if)# frame-relaymapip 10.1.1.2 201 R2(config)# interface serial0/0/1.201 point-to-point R2(config-if)# no frame-relayinvers-arp R3(config)# interface serial0/0/1.301 point-to-point R3(config-if)# no frame-relayinvers-arp R2(config)# interface serial0/0/1.201 point-to-point R2(config-if)# frame-relay interface-dlci 201 R3(config)# interface serial0/0/1.301 point-to-point R3(config-if)# frame-relay interface-dlci 301 Observable Description Max Value 1 correctness of response 2 points for Option 4 0 points for anyother option 2 This item references content from the following areas: CCNA Exploration: Accessing the WAN * 3.1.2 Virtual Circuits 18

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R2(confi if)# frame relaymapip 10.1.1.1 201 broadcast R3(confi if)# frame relaymapip 10.1.1.1 301 broadcast

R2(confi if)# frame relaymapip 10.1.1.3 201 broadcast R3(confi if)# frame relaymapip 10.1.1.2 301 broadcast R2(confi if)# frame relaymapip 10.1.1.1 201 broadcast R3(confi if)# frame relaymapip 10.1.1.1 301 broadcast

R2(confi if)# frame relaymapip 10.1.1.3 201 broadcast R3(confi if)# frame relaymapip 10.1.1.2 301 broadcast Observable Description Max Value 1 correctness of response 2 points for Option 4

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The broadcastswillbeforwarded to 10.1.1.1. The router will use DLCI 22 to forward data to 10.1.1.1. DLCI 22 will replace the MAC address in the ARP table for entry 10.1.1.1 Inverse ARP willnowadd an entry for 10.1.1.1 into the Frame Relay map table usin DLCI 22. Frames sent by 10.1.1.1 arrivin on interface serial 0/0/0 of RT_1 will have a data lin layer address of 22. Observable Description Max Value 1 correctness of response Option 2 and Option 5 are correct. 1 point for each correct option. 0 points if more options are selectedthanrequired. 2 This item references content from the followin areas: CCNA Exploration: Accessin the WAN * 3.1.5 Frame Relay AddressMappin

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