CCNA2 FINAL A+B+C套英文版.docx

CCNA2 FINAL A+B+C套英文版.docx

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CCNA2FINALA+B+C套英文版

CCNA第二学期《FinalExaminnation》英文A卷

1Whataretwofunctionsofarouter?

（Choosetwo.）

Itforwardsdatapacketstowardtheirdestination.

ItforwardsthepackettothedestinationiftheTTLvalueis0.

ItchangesthedestinationIPaddressofdatapacketsbeforeforwardingthemtoanexitinterface.

ItdeterminesthebestpathbasedonthedestinationMACaddress.

ItactsasanintersectionbetweenmultipleIPnetworks.

2Whichroutercomponentcontainsascaled-downversionoftheIOSthatcanbeusedtoreloadacompleteversionoftheIOSintheeventthattheIOSbecomesdamagedorcorrupted?

ROM

Flash

SDRAM

NVRAM

3Usingdefaultsettings,whatisthenextstepintherouterbootsequenceaftertheIOSloadsfromflash?

PerformthePOSTroutine.

SearchforabackupIOSinROM.

LoadthebootstrapprogramfromROM.

Loadtherunning-configfilefromRAM.

Locateandloadthestartup-configfilefromNVRAM.

4

Refertotheexhibit.Howmanyroutesareultimateroutes?

3

4

5

7

5

Refertotheexhibit.Whichpathwilltrafficfromthe172.16.1.0/24networktaketogettothe10.0.0.0/24network?

ADC

ABC

ItwillloadbalancethetrafficbetweenADCandABC

ItwillsendthetrafficviaABC,andwilluseADCasabackuppathonlywhenABCfails.

6

Refertotheexhibit.RoutersR1andR3usedifferentroutingprotocolswithdefaultadministrativedistancevalues.Alldevicesareproperlyconfiguredandthedestinationnetworkisadvertisedbybothprotocols.

WhichpathwillbeusedtotransmitthedatapacketsfromPC1toPC2?

ThepacketswilltravelviaR2-R1.

ThepacketswilltravelviaR2-R3.

Thetrafficwillbeload-balancedbetweentwopaths—viaR2-R1andviaR2-R3.

ThepacketswilltravelviaR2-R3,andtheotherpathviaR2-R1willberetainedasthebackuppath.

7

Refertotheexhibit.ThenetworkisconfiguredforOSPFroutingwithdefaultsettings.Thebandwidthshavebeenconfiguredcorrectlyforeachlink.IftheT1linkbetweenrouterAandrouterEfails,whatpathwillapacketfromrouterAtaketoreachtheLANattachedtorouterFwhenthenetworkhasconverged?

A,B,C,F

A,B,C,E,F

A,D,G,E,F

A,D,G,H,F

8Inalabtestenvironment,arouterhaslearnedaboutnetwork172.16.1.0throughfourdifferentdynamicroutingprocesses.Whichroutewillbeusedtoreachthisnetwork?

D172.16.1.0/24[90/2195456]via192.168.200.1,00:

00:

09,Serial0/0/0

O172.16.1.0/24[110/1012]via192.168.200.1,00:

00:

22,Serial0/0/0

R172.16.1.0/24[120/1]via192.168.200.1,00:

00:

17,Serial0/0/0

I172.16.1.0/24[100/1192]via192.168.200.1,00:

00:

09,Serial0/0/0

9Whichtwostatementsaretrueforlink-stateroutingprotocols?

（Choosetwo.）

Routersthatrunalink-stateprotocolcanestablishacompletetopologyofthenetwork.

Routersinamultipointnetworkthatrunalink-stateprotocolcanexchangeroutingtables.

Routersuseonlyhopcountforroutingdecisions.

Theshortestpathfirstalgorithmisused.

Splithorizonisusedtoavoidroutingloops.

10

Refertotheexhibit.WhichoptionwillprovidetheconfigurationthatisneededforrouterR1todynamicallylearnroutestothe192.168.100.16/28,192.168.100.32/28,and192.168.100.48/28subnetworks?

withstaticroutes

witharoutedprotocol

witharoutingprotocol

withdirectlyconnectedroutes

11

Refertotheexhibit.Whatisthemeaningofthehighlightedvalue120?

Itisthemetricthatiscalculatedbytheroutingprotocol.

ItisthevaluethatisusedbytheDUALalgorithmtodeterminethebandwidthforthelink.

Itistheadministrativedistanceoftheroutingprotocol.

Itisthehold-downtime,measuredinseconds,beforethenextupdate.

12Whichstatementistrueaboutthemetricsusedbyroutingprotocols?

Ametricisavalueusedbyaparticularroutingprotocoltocomparepathstoremotenetworks.

Acommonmetricisusedbyallroutingprotocols.

Themetricwiththehighestvalueisinstalledintheroutingtable.

Theroutermayuseonlyoneparameteratatimetocalculatethemetric.

13Whichroutingprotocolbydefaultusesbandwidthanddelaytocalculatethemetricofaroute?

RIPv1

RIPv2

OSPF

EIGRP

14Whichthreeroutingmetricsarecorrectlydefined?

（Choosethree.）

delay-thelinkspeed

reliability-theerrorrateonalink

load-theamountoftrafficonalink

cost-thevaluetoindicatepreferenceforaroute

hopcount-thepathselectedwiththehighestbandwidth

bandwidth-theamountoftimeittakesapackettotravelalink

15Whichtwostatementsaboutroutingprotocolsareaccurate?

（Choosetwo.）

OSPFsupportsVLSM.

RIPv1supportsVLSM.

RIPv2doesnothaveahopcountlimit.

EIGRPsupportsdiscontiguousnetworkdesigns.

RIPv2doesnotsupportdiscontiguousnetworkdesigns.

16

Refertotheexhibit.AdeviceisrequiredtocompletetheconnectionbetweenrouterR1andtheWAN.Whichtwodevicescanbeusedforthis?

（Choosetwo.）

aCSU/DSUdevice

amodem

anEthernetswitch

ahub

abridge

17Whenconnectingtwodevices,whichsituationwouldnormallyrequiretheuseofacrossovercable?

connectingahosttoaswitch

connectingaswitchtoarouter

connectingaswitchtoaswitch

connectingahosttoarouterconsoleport

18

Refertotheexhibit.Anetworkadministratorhasruntheshowinterfacecommand.Theoutputofthiscommandisdisplayed.Whatisthefirststepthatisrequiredtomakethisinterfaceoperational?

Switchthecablewithaknownworkingcable.

Issuethenoshutdowncommandontheinterface.

Configuretheinterfaceasaloopbackinterface.

Settheencapsulationfortheinterface.

19Whichportshouldaterminalemulatorbeconnectedtoinordertoaccessarouterwithoutnetworkconnectivity?

T1

serial

console

FastEthernet

20Whichroutermodeisaccessedbyenteringtheenablecommand?

userEXEC

privilegedEXEC

globalconfiguration

interfaceconfiguration

21

Refertotheexhibit.WhenastaticIPaddressisbeingconfiguredonthehost,whataddressshouldbeusedforthedefaultgateway?

10.1.1.1

10.1.1.2

172.16.1.1

192.168.1.1

22

Refertotheexhibit.Theshowcdpneighborscommandwasrunononeofthedevicesasshown.Basedonthisinformation,whichtwofactscanbedetermined?

（Choosetwo.）

Thecommandwasrunontherouter.

ABCDisanon-CISCOdevice.

Layer3connectivitybetweentwodevicesexists.

ABCDsupportsroutingcapability.

ABCDisconnectedtotheFa0/0interfaceoftheneighboringdevice.

23

Refertotheexhibit.WhichstatementistrueabouttheEthernetinterfacesshowninthenetwork?

AframeleavesinterfaceFa0/0ofR1withthesourceMACaddressas000C.3010.9260.

Hostson10.1.1.0/24willuse172.16.3.1/24astheirdefaultgateway.

ApacketwillnotbeforwardedbetweenR1andR2untilthenoshutdowncommandisissuedontheFa0/0interfaceofR1.

TheFa0/0interfaceofR2couldbeconfiguredwiththeIPaddress172.16.4.1/24andstillhaveconnectivityonthislink.

24

Refertotheexhibit.WhichsolutionprovidesthemostefficientuseofrouterresourcesforforwardingtrafficbetweenBRandHQ?

RIP

RIPv2

EIGRP

staticroutes

25

Refertotheexhibit.PingsarefailingbetweenHostAandHostB.ThenetworkadministratordiscoversthatRouter1doesnothavearoutetothe172.16.0.0network.AssumingRouter2isconfiguredcorrectly,whichtwostaticroutescouldbeconfiguredonRouter1toenableHostAtoreachnetwork172.16.0.0?

（Choosetwo.）

iproute172.16.0.0255.255.0.0S0/0

iproute172.16.0.0255.255.0.0S0/1

iproute172.16.0.0255.255.0.0192.168.0.1

iproute172.16.0.0255.255.0.0192.168.0.2

iproute192.168.0.1172.16.0.0255.255.0.0S0/0

iproute192.168.0.1172.16.0.0255.255.0.0S0/1

26

Refertotheexhibit.HowwastheOSPFdefaultgatewayentryforR2determined?

DefaultroutesareautomaticallyinjectedbyOSPFintoalladvertisements.

AstaticdefaultgatewayrouteisdefinedintheconfigurationofR2.

Thedefault-informationoriginatecommandisappliedonR1.

TheISPdefinesthegatewayoflastresortandautomaticallypassesittoR1andR2.

Theipdefault-gatewaycommandisappliedonR2.

27

Refertotheexhibit.Onthebasisoftheshowrunning-configoutput,whichoptioncorrectlyreflectstheroutesthatwillbelistedintheR2routingtable?

答案：

D

28

Refertotheexhibit.AnetworkadministratorconfiguresastaticrouteonrouterR1toreachthe192.168.1.0/24network.WhichIPaddressshouldbeusedasthenext-hopaddressintheiproutecommand?

192.168.1.1

192.168.2.1

192.135.250.1

192.135.250.2

29Becauseofatopologychange,thenexthopIPaddressinthecurrentstaticroutemustbereconfigured.Howcanastaticrouteentrybealteredtoaccommodateatopologychange?

KeeptheexistingstaticrouteandconfigureanewstaticroutewiththecorrectnexthopIPaddress.

NegatetheexistingstaticrouteandconfigureanewstaticroutewiththecorrectnexthopIPaddress.

Donothing.TheexistingstaticroutewillautomaticallyupdatethenexthopentrywiththenewIPaddress.

Keeptheexistingstaticroute,reloadtherouter,andconfigureanewstaticroutewiththecorrectnexthopIPaddress.

30

Refertotheexhibit.Theentire192.168.1.0networkhasbeenallocatedtoaddresshostsinthediagram.UtilizingVLSMwithcontiguousaddressblocks,whichsetofaddressesandprefixescouldbeusedtocreateanaddressingsolutionwithaminimumwasteofIPaddresses?