CCNA+第四学期章节测试题答案e43.docx

CCNA+第四学期章节测试题答案e43.docx

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CCNA+第四学期章节测试题答案e43

ExamViewer-EWANChapter3-CCNAExploration:

AccessingtheWAN（Version4.0）

Belowyouwillfindtheassessmentitemsaspresentedontheexamaswellasthescoringrulesassociatedwiththeitem.

CiscoNetworkingAcademycontentiscopyrightedandtheunauthorizedposting,distributionorsharingofthisexamcontentisprohibited.

1

窗体顶端

WhichbestdescribesthebenefitofusingFrameRelayasopposedtoaleasedlineorISDNservice?

Customerscandefinetheirvirtualcircuitneedsinfargreatercombinations,withincrementsassmallas64kbps.

Customerspayforanend-to-endconnectionthatincludesthelocalloopandthenetworklink.

Customersonlypayforthelocalloopandthebandwidththeypurchasefromthenetworkprovider.

ConnectingnewsitesrequiresnewlowercostcircuitinstallationswhencomparedtoISDNdialupcostsoraddingadditionalhardwareforleasedservice.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption3

0pointsforanyotheroption

2

2

窗体顶端

WhattwomethodsdoesFrameRelaytechnologyusetoprocessframesthatcontainerrors?

（Choosetwo.）

FrameRelayservicesdependontheupperlayerprotocolstohandleerrorrecovery.

Itrequiresthereceivingdevicetorequestthatthesenderretransmiterroneousframes.

FECN,BECN,andDEbitsaresetintheframestominimizeerrors.

Thereceivingdevicedropsanyframesthatcontainerrorswithoutnotifyingthesender.

Theframerelayswitchnotifiesthesenderthaterrorsweredetected.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option1andOption4arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2

3

窗体顶端

Whatbestdescribestheuseofadata-linkconnectionidentifier（DLCI）?

localaddressidentifyingadestinationrouteracrossaFrameRelaynetwork

locallysignificantaddressusedtoidentifyavirtualcircuit

logicaladdressidentifyingtheinterfacebetweenarouterandaFrameRelayswitch

logicaladdressusedtoidentifytheDCE

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption2

0pointsforanyotheroption

2

4

窗体顶端

WhatiscreatedbetweentwoDTEsinaFrameRelaynetwork?

ISDNcircuit

limitedaccesscircuit

switchedparallelcircuit

virtualcircuit

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption4

0pointsforanyotheroption

2

5

窗体顶端

WhichtwoitemsallowtheroutertomapdatalinklayeraddressestonetworklayeraddressesinaFrameRelaynetwork?

（Choosetwo.）

ARP

RARP

ProxyARP

InverseARP

LMIstatusmessages

ICMP

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option4andOption5arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2

6

窗体顶端

Refertotheexhibit.Apingissenttoaddress192.168.50.10fromthePeanutrouter.WhichDLCIwillbeusedtosendtheping?

110

115

220

225

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption1

0pointsforanyotheroption

2

7

窗体顶端

Refertotheexhibit.Whateffectdoesthepoint-to-pointconfigurationonsubinterfaceS0/0.110haveontheoperationoftherouter?

IthelpstoconserveIPaddresses.

ItestablishesmultiplePVCconnectionstomultiplephysicalinterfaces.

Iteliminatessplithorizonissueswithoutincreasingthelikelihoodofroutingloops.

Itrequirestheconfigurationoftheencapsulationcommandonthesubinterface.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption3

0pointsforanyotheroption

2

8

窗体顶端

WhichthreeactionsmightaFrameRelayswitchperformwhenitdetectsanexcessivebuild-upofframesinitsqueue?

（Choosethree.）

putsaholdonacceptingframesinexcessoftheCIR

dropsframesfromthequeuethathavetheDEbitset

reducesthenumberofframesitsendsoverthelink

re-negotiatesflowcontrolwiththeconnecteddevice

setstheFECNbitonallframesitreceivesonthecongestedlink

setstheBECNbitonallframesitplacesonthecongestedlink

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option2,Option5,andOption6arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

3

9

窗体顶端

Refertotheexhibit.Whichtwostatementsaretruegiventheoutputshown?

（Choosetwo.）

TheIPaddressofthelocalFrameRelayinterfaceis172.16.1.4.

ThelocalDLCInumberis401.

InverseARPisbeingusedonthisconnection.

Thisinterfaceisintheactivestateandintheprocessofnegotiatingconfigurationparameters.

Multicastisnotenabledonthisconnection.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option2andOption3arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2

10

窗体顶端

WhichFrameRelaytopologyisacompromiseofcosts,reliability,andcomplexitywhentheWANcontainsoneheadquarterssite,40regionalsites,andseveralsiteswithineachregionalsite?

star

fullmesh

partialmesh

point-to-multipoint

point-to-point

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption3

0pointsforanyotheroption

2

11

窗体顶端

Refertotheexhibit.WhatcanbedeterminedabouttheFrameRelayswitchfromtheoutputshown?

Itiscurrentlynottransmittingdata.

ItisintheprocessofestablishingthePVC.

IthasputaholdonprocessingframesinexcessoftheCIR.

Itisexperiencingcongestion.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption4

0pointsforanyotheroption

2

12

窗体顶端

Refertotheexhibit.FrameRelayconnectivityhasbeenconfiguredinthenetworkandOSPFisusedastheroutingprotocol.RouterR1cansuccessfullypingtherouterR2serialinterface.WhenR1attemptstopingnetwork192.168.3.0/24thepingfails.Whatadditionalconfigurationshouldbeappliedonallrouterstoremedytheproblem?

AddthebroadcastkeywordintheFrameRelaymapcommandonbothrouters.

Issuetheframe-relayinterface-dlcicommandinadditiontotheframe-relaymapcommandonbothrouterinterfaces.

Removetheframe-relaymapcommandandreplacewiththeframe-relayinterface-dlcicommandonbothrouterinterfaces.

Applythenoframe-relayinverse-arpcommandonbothrouterinterfaces.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption1

0pointsforanyotheroption

2

13

窗体顶端

WhichstatementaboutFrameRelaysubinterfacesiscorrect?

MultipointinterfaceswillautomaticallyforwardroutingbroadcastsbutwillconsumemoreIPaddressesthanpoint-to-pointsubinterfaceswillconsume.

Point-to-pointsubinterfacesactlikeleasedlinesandeliminatesplit-horizonroutingissues.

InterfaceswithmultiplePVCsrequireaseparatesubinterfaceforeachPVC.

Multipointconfigurationscannotusesubinterfaces.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption2

0pointsforanyotheroption

2

14

窗体顶端

Refertotheexhibit.YouareanetworkadministratorwhohasbeentaskedwithcompletingtheFrameRelaytopologythatinterconnectstworemotesites.RouterHQbelongstoboththe172.16.1.0/24and172.16.2.0/24subnetswithIPaddressesof172.16.1.3and172.16.2.3respectively.TrafficbetweenR1andR2musttravelthroughHQfirst.HowshouldtheserialinterfaceonHQbeconfiguredtocompletethetopology?

onemultipointsubinterface

twopoint-to-pointsubinterfaces

withthephysicalinterfaceconfiguredwithtwoipaddresses

oneIPaddressonapoint-to-pointsubinterfaceandoneIPaddressonthephysicalinterface

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption2

0pointsforanyotheroption

2

15

窗体顶端

WhatconsiderationmustbetakenintoaccountifRIPisusedonFrameRelaymultiaccessnetworks?

Toforwardroutingupdates,address-to-DLCImappingmustbedoneviatheuseoftheframe-relaymapcommandcoupledwiththebroadcastkeyword.

InverseARPmustbeenabledtoturnroutingupdatebroadcastsintounicasttrafficthatcanbepropagatedtootherFrameRelaynodes.

Becausebroadcasttrafficisnotsupported,RIPv1cannotbeimplementedonFrameRelaynetworks.

Toforwardbroadcastroutingupdates,dynamicmappingmustbeenabled.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption1

0pointsforanyotheroption

2

16

窗体顶端

Refertotheexhibit.WhichstatementexplainswhytheFrameRelayconnectionbetweenR1andR2isfailing?

Splithorizonmustbedisabled.

TheLMItypemustbespecified.

Logicalsubinterfacesmustbeusedinstead.

Theframe-relaymapcommandsareusingincorrectDLCIs.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption4

0pointsforanyotheroption

2

17

窗体顶端

Refertotheexhibit.Rou