ccna final4E英文A+B两卷.docx

ccna final4E英文A+B两卷.docx

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ccnafinal4E英文A+B两卷

这是A卷，不下载可以直接复制了

1

Refertotheexhibit.AnetworkadministratorischeckingthestatusofrouterRTR_2.WhatisthemostlikelyreasonforthecurrentstatusoftheseriallinktoRTR_1?

*Acablehasbecomedisconnected.

ThecircuitisexperiencingexcessiveRFI.

Authenticationisnotproperlyconfiguredontherouters.

TheroutersareconfiguredfordifferentWANencapsulations.

Theclockrateisnotproperlyconfiguredononeoftherouters.

2

Whiletestinganewnetworkdesigninthelab,anetworkadministratorisconfiguringaseriallinkthatconnectstworoutersback-to-back.Inordertofinishtheconfiguration,theadministratorneedstoidentifywhichrouterisconnectedtotheDCEendofthecable.Whatcommandcanbeissuedtoprovidethisinformation?

router#showstatusserial0/0

*router#showcontrollersserial0/0

router#showprotocolsserial0/0

router#showversion

router#showinterfacesserial0/0

3

Whichstatementsarecorrectaboutthepointinthenetworkwheretheresponsibilityoftheserviceproviderends?

（Choosethree.）

*TheInternationalpointisonthecustomersideofthenetworkterminatingunit（NTU）.

*TheUnitedStatespointisattheinterfaceofthecustomer-providedequipmentandthelocalloop.

TheresponsibilityforthispointiscontrolledbyIANA.

*Thepointiscalledthedemarcationpoint.

Thepointistypicallylocatedattheserviceprovider'scentraloffice.

Thepointislocatedbetweenthecustomer'slocalareanetworks.

4

AsystemadministratormustprovideInternetconnectivityfor25hostsataninsuranceagency.TheISPhasassignedtwopublicIPaddressestothiscompany.WhatcantheadministratordotoprovideInternetaccesstoall25usersatthesametime?

*ConfiguretherouterwithdynamicNATwithPAT.

ConfiguretherouterwithdynamicNATfor25users.

ConfiguretherouterwithDHCPandstaticNAT.

ConfiguretherouterwithstaticNATforall25users.

Thiscannotbedonewithonlytwopublicaddresses.

5

AsystemadministratorisunabletopingtheSerial0/0interfaceofRouterBfromRouterA.Duringthetroubleshootingprocess,thefollowingfactsareestablished:

-IPaddressingandsubnetmasksarecorrect.-RouterAisaCiscorouterandRouterBisarouterfromanothervendor.-RouterAisconfiguredwiththedefaultencapsulation.-Theserialinterfacesonbothroutersareup.-Theprotocolisdownontheserialinterfacesofbothrouters.Whatshouldtheadministratordotosolvetheproblem?

AddaclockrateonRouterA.

EnabletheserialinterfaceonRouterB.

*ChangetheencapsulationonbothrouterstoPPP.

ConnecttheserialcabletothecorrectinterfaceonRouterB.

UsethecorrectserialcabletoattachtheCSU/DSUtoRouterB.

6

AnetworkadministratormustprovideWANconnectivitybetweentheCentralofficeandthreeremotesites:

EastBranch,WestBranch,andRemote.TheEastBranchandWestBranchofficesreceivesalesordersandtransmitshippingconfirmationstotheCentralofficeconsistentlythroughouttheday.TheRemoteofficeisstaffedbyonesalespersonwhotravelsthroughthenorthwesternterritory.ThesalespersonoccasionallyneedstoconnecttotheCentralofficefore-mailaccess.HowshouldthenetworkadministratorconnectthesesitestotheCentraloffice?

（Choosetwo.）

ConnecttheEastBranchandWestBranchremoteofficeswithISDNconnections.

*ConnecttheEastBranchandWestBranchofficeswithFrameRelayconnections.

ConnecttheEastBranchandWestBranchofficeswithPOTSdial-upconnections.

ConnecttheRemoteofficewithaFrameRelayconnection.

ConnecttheRemoteofficewithanISDNconnection.

*ConnecttheRemoteofficewithaPOTSdial-upconnection.

7

AsystemadministratorneedstoconfiguretheregionalofficewithISDNforDDRconnectionstothreeremotesites.EachremotesiterequiresdifferentIPsubnets,differentencapsulations,anddifferentauthenticationmethods.Thesiteswillnotbeconnectedatthesametime.Thecompanywouldliketoaccomplishthisinthemostcosteffectivemanner.WhatmethodcanthesystemadministratorusetoaccomplishthistaskusingthefewestBchannels?

InstallandconfigureaPRI.

InstallandconfigureaBRIinterfacewithseparateSPIDsforeachremotesite.

InstallandconfigureaBRIwithmultipleswitchtypesinglobalconfiguration.

*InstallandconfigureaBRIusingdialerprofiles.

InstallandconfigureaseparateBRIforeachremotesite.

8

AnetworkadministratorishavingdifficultyinestablishingaseriallinkbetweenaCiscorouterandarouterfromanothervendor.BothroutersareconfiguredforHDLCencapsulation.Whichstatementsaretrueregardingthisconfiguration?

（Choosetwo.）

*TheCiscoHDLCframeusesaproprietary"Type"fieldthatmaynotbecompatiblewithequipmentofothervendors.

HDLCrequiresaclockratetobeconfiguredontheroutersatbothendsoftheseriallink.

*PPPencapsulationisrecommendedforseriallinksbetweenequipmentfrommultiplevendors.

UsernamesmustbeconfiguredatbothendsoftheHDLCseriallink.

TheHDLCvendortypemustbeenabledontheCiscorouter.

ThereisamismatchintheHDLCauthenticationpasswordconfigurations.

9

WhichofthefollowingistheorderforthethreephasesofestablishingaPPPseriallinkwithauthentication?

authentication,link-establishment,networklayerprotocols

authentication,networklayerprotocols,link-establishment

networklayerprotocols,link-establishment,authentication

networklayerprotocols,authentication,link-establishment

*link-establishment,authentication,networklayerprotocols

link-establishment,networklayerprotocols,authentication

10

TheserialPPPlinkbetweentheLeftandRightroutersisconfiguredasshowninthediagram.WhichconfigurationissueexplainswhythelinkisunabletoestablishaPPPsession?

TheIPaddressesmustbeondifferentsubnets.

*Theusernamesaremisconfigured.

ThepasswordsmustbedifferentfortheCHAPauthentication.

Theclockratemustbe56000.

Theclockrateisconfiguredonthewrongendofthelink.

Interfaceserial0/0onLeftmustconnecttointerfaceserial0/1onRight.

11

Refertotheexhibit.ThelinkbetweentheRTR-1andRTR-2routersisconfiguredasshownintheexhibit.AlthoughtheshowinterfacescommandshowstheinterfacestatusasSerial0isup,lineprotocolisup,IPtrafficisnotcrossingthislink.Whatistheproblem?

Theusernamesaremisconfigured.

Theclockrateisconfiguredonthewrongendofthelink.

*TheIPaddressesarenotinthesamesubnet.

Interfaceserial0/0onRTR-1mustconnecttointerfaceserial0/1onRTR-2.

ThepasswordsmustbedifferentfortheCHAPauthentication.

Theclockratemustbe56000.

12

Atechnicianenterstheinterfaceserial0/0.1multipointcommandwhenconfiguringarouter.Whateffectwillthemultipointkeywordhaveinthisconfiguration?

（Choosetwo.）

*Split-horizonissueswillneedtoberesolvedforthisnetworkifRIPistheroutingprotocol.

AsubinterfacewillbedefinedforeachPVC.

*Alltheparticipatinginterfacesofremoterouterswillbeconfiguredinthesamesubnet.

AsingleDLCIwillbeusedtodefineallthePVCstotheremoterouters.

AnIPaddresswillneedtobeconfiguredonthemaininterface.

13

WhichroutercommandwouldbeusedtoassociateaLayer2addresswiththecorrespondingLayer3addressintheinternetworkinthediagram?

RouterA（config-if）#frame-relaypvc100192.168.15.2

RouterA（config-if）#dialer-mapip192.168.15.1100broadcast

*RouterA（config-if）#frame-relaymapip192.168.15.2100broadcast

RouterA（config-if）#dialer-map192.168.15.1101serial0broadcast

RouterA（config-if）#frame-relaydlci101192.168.15.1broadcast

RouterA（config-if）#dialer-map192.168.15.1inverse-arpbroadcast

14

Refertotheexhibit.TworoutersareconnectedthroughaFrameRelaypoint-to-pointPVC.TheILM-5routerisfromavendorotherthanCisco.WhichinterfacecommandisrequiredtoconfigurethelinkbetweentheCiscoILM-3routerandrouterILM-5?

ILM-3（config-if）#encapsulationframe-relaycisco

ILM-3（config-if）#frame-relaypvcmultipoint

*ILM-3（config-if）#encapsulationframe-relayietf

ILM-3（config-if）#frame-relaylmi-typeansi

ILM-3（config-if）#frame-relaypvcpoint-to-point

15

Whatdoestheoutputoftheshowframe-relaymapcommandshownbelowrepresent?

（Choosetwo.）Serial0（up）:

ip172.30.151.4dlci122,dynamic,broadcast,statusdefined,active

*172.30.151.4representstheIPaddressoftheremoterouter.

172.30.151.4representstheIPaddressofthelocalserialinterface.

DLCI122representstheinterfaceoftheremoterouter.

*broadcastindicatesthatadynamicroutingprotocolsuchasRIPv1cansendpacketsacrossthisPVC.

dynamicindicatesthatadynamicroutingprotocolisenabledforthisconnection.

activeindicatesthattheARPprocessisworking.

16

Theoutputoftheshowinterfacesserial0/0commandforaframe-relayconnectionindicatesthattheseriallineisupbutthelineprotocolisdown.Whatarepossiblecausesforthis?

（Choosetwo.）

*ThereisanLMI-typemismatchbetweentheFrameRelayswitchandtherouter.

*Thereisnoclockpresentontheserialinterface.

Theinterfaceisshutdown.

RARPisnotfunctioningontherouter.

Thecableisdisconnected.

17

Whataretwowaystoresolvesplit-horizonissuesinaFrameRelaynetwork?

（Choosetwo.）

*createafull-meshtopology

disableInverseARP

*usepoint-to-pointsubinterfaces

usemultipointsubinterfaces

removethebroadcastkeywordfromtheframe-relaymapcommand

18

Anetworkadministratorissuedthecommandshowframe-relaypvc.TheresponsefromtheroutershowsthestatusofaPVCasdeleted.Whatisthereasonforthisoutput?

TheDLCIisusingthewrongLMItype.

TheDLCIisus