CCNA2 final期末考試答案A

1.AtechnicianconfigurestheFa0/0interfaceonarouterwithipaddress52.Whatadditionalcomm

issuedbythetechniciantoactivatetheinterfacetoforwardtraffic?

Router(config-if)#exit

Router(config-if)#noshutdown

Router(config-if)#clockrate

Router#copyrunning-configstartup-config

2

Refertotheexhibit.AtechnicianhasconfiguredtheinterfacesontheRouter,butuponinspectiondiscoversthatinterface

FastEthernet0/1isnotfunctioning.WhichactionwillmostlikelycorrecttheproblemwithFastEthernet0/1?

Aclockrateshouldbeaddedtotheinterfaceconfiguration.

Thesubnetmaskshouldbeaddedtotheinterfaceconfiguration.

Aninterfacedescriptionneedstobeaddedtotheinterfaceconfiguration.

Thenoshutdowncommandneedstobeaddedtotheinterfaceconfiguration.

3

Refertotheexhibit.Arouterinterfaceisconfiguredwiththecommandipaddress1.Whichseto

valueswouldallowacomputerthatisconnectedtotherouterinterfacetocommunicatewithremotenetworks?

A:54

B:

C:1

A:1

B:

C:55

A:54

B:

C:1

A:1

B:

C:

4

Refertotheexhibit.Onthebasisoftheshowrunning-configoutput,whichoptioncorrectlyreflectstheroutesthatwillbe

routingtable?

ssss

5

Refertotheexhibit.PC1isunabletoaccesstheInternet.Whatisthecauseoftheproblem?

AnincorrectIPaddressisconfiguredbetweenthetworouters.

NostaticrouteisconfiguredonRouter2.

Aroutingloophasoccurred.

Noroutingprotocolisconfiguredoneitherofthetworouters.

Refertotheexhibit.WhichthreestatementsaretrueoftheroutingtableforRouter1?(Choosethree.)

TheroutetonetworkhasanADof156160.

Network6canbestbereachedusingFastEthernet0/0.

TheADofEIGRProuteshasbeenmanuallychangedtoavalueotherthanthedefaultvalue.

Router1isrunningboththeEIGRPandOSPFroutingprocess.

Networkcanonlybereachedusingadefaultroute.

Nodefaultroutehasbeenconfigured.

7

Refertotheexhibit.Thenetworkhasthreeconnectedrouters:R1,R2,andR3.Theroutesofallthreeroutersaredisplaye

areoperationalandpingsarenotblockedonthisnetwork.

Whichpingwillfail?

fromR1to

fromR1to

fromR2to

fromR2to

8

Refertotheexhibit.AnetworkadministratorhasconfiguredOSPFusingthefollowingcommand:

network21area0

WhichrouterinterfacewillparticipateinOSPF?

FastEthernet0/0

FastEthernet0/1

Serial0/0/0

Serial0/0/1

9

Refertotheexhibit.ThehostsontheR1LANareunabletoaccesstheInternet.Whatisincorrectlyconfigured?

theIPaddressoftheFa0/0interfaceatR1

theIPaddressoftheS0/0/1interfaceatR2

theIPaddressoftheS0/0/0interfaceatR1

thesubnetmaskoftheS0/0/1interfaceatR2

10

Refertotheexhibit.HostAishavingproblemsaccessingserverA.AllroutershavethesameEIGRPconfigurationasrou

WhatshouldbedonesothathostAcanaccessserverA?

Addthecommandnoauto-summaryonallrouters.

Changethenetworkstatementstoincludeawildcardmask.

AdjusttheEIGRPhellotimerstoaccountforthenetworkdelay.

Addthecommandeigrplog-neighbor-changesonallrouters.

WhichfeatureofRIPv2enablesittofunctionasaclasslessroutingprotocol?

Subnetmasksareincludedinroutingupdates.

Routingupdatesaretriggeredbytopologychanges.

Next-hopaddressesareincludedinroutingupdates.

Multicastaddressesareusedtosendroutingupdates.

12Anetworkadministratormustusethesubnet/18tocreate6additionalsubnetseachcontainingupto2000h

LANs.Whichsubnetmaskshouldtheadministratorusetocreatethenewsubnets?

13

Anetworkadministratorisinchargeoftwoseparatenetworksthatshareasinglebuilding.Whatdevicewillberequiredto

twonetworksandaddacommonconnectiontotheInternetthatcanbeshared?

hub

router

accesspoint

Ethernetswitch

14

Refertotheexhibit.Whatneedstobedonetoallowthesetworouterstoconnectsuccessfully?

AddaclockratetoS0/0/0onR1.

AddaninterfacedescriptiontoS0/0/1onR2.

ChangetheserialinterfaceonR2toS0/0/0sothatitmatchesR1.

ChangetheIPaddressofS0/0/1onR2sothatitisinthesamesubnetasR1.

15

Inwhichsituationwouldadefaultstaticrouteberecommended?

whenconnectinganedgeroutertotheInternet

whenvariablelengthsubnetmaskingisineffect

whenthereismorethanonevalidrouteforadestinationnetwork

whenadestinationnetworkhasalargermaskthananyroutesintheroutingtable

Refertotheexhibit.AnetworkengineerhasruntheshowversioncommandonR3.Uponrebooting,R3doesnotloadth

configurationsettings.

Whatcouldbethecauseofthisproblem?

ThereisinsufficientNVRAM.

Thereisinsufficientflashmemory.

Theconfigurationregisterisnotconfiguredwiththedefaultsetting.

ThesystemimagefileisnotlocatedinNVRAM.

17

Refertotheexhibit.HostAisunabletoaccesstheInternet.Whatisthereasonforthis?

TheIPaddressofhostAisincorrect.

ThedefaultgatewayofhostAisincorrect.

TheFa0/1interfacesofthetworoutersareconfiguredfordifferentsubnets.

ThesubnetmaskfortheFa0/0interfaceofR1isincorrect.

18

Refertotheexhibit.R1andR2areadjacentroutersbothrunningRIP.Allinterfacesonbothroutersarecorrectlyconfigur

operational.Bothroutersareconfiguredtoincludeallconnectedinterfacesinroutingupdates.R2isnotshowinganyrout

theroutingtable.Whatisthelikelycause?

Theadjacentinterfacesarepassive.

Thedistanceof120exceeds15hops.

R2willnotacceptversion1updatesfromR1.

RoutesarebeingsummarizedbyR1butnotbyR2.

19Whichtwotechnologiescanbeusedindistancevectorroutingprotocolstopreventroutingloops?(Choosetwo.)

authentication

link-stateadvertisements

hold-downtimers

SpanningTreeProtocol

splithorizon

20

WhichpromptisusedtoallowausertochangetheIPaddressofaninterfaceonarouter?

Router>

Router#

Router(config)#

Router(config-if)#

Refertotheexhibit.AnetworkadministratoraddsthiscommandtorouterR1:iprouteS0/0/0

resultofaddingthiscommand?

Thisrouteisautomaticallypropagatedthroughoutthenetwork.

Thetrafficfornetworkisforwardedtonetwork.

Astaticrouteisestablished.

ThetrafficforallClassCnetworksisforwardedto.

22

Refertotheexhibit.Whatinformationcanbedeterminedfromthedisplayedoutput?

EIGRPpacketsarewaitingtobesenttotheneighbors.

Theadjacenciesbetweentheroutersareyettobeestablished.

TheIPaddress0isconfiguredatserialinterfaceS0/0/1ofrouterR2.

RouterR2isreceivinghellopacketsfromaneighborwiththeIPaddress0viatheR2S0/0/1interface.

23

Refertotheexhibit.Basedonthepartialoutputintheexhibit,whycanusersestablishaconsoleconnectiontothisrouter

enteringapassword?

Thelogincommandwasnotenteredontheconsoleline.

Theenablepasswordshouldbeanenablesecretpassword.

Nousernameandpasswordcombinationhasbeenconfigured.

Consoleconnectionscannotbeconfiguredtorequireuserstoprovidepasswords.

24Whichofthefollowingareprimaryfunctionsofarouter?(Choosetwo.)

packetswitching

microsegmentation

domainnameresolution

pathselection

flowcontrol

25

Becauseofatopologychange,thenexthopIPaddressinthecurrentstaticroutemustbereconfigured.Howcanastatic

alteredtoaccommodateatopologychange?

KeeptheexistingstaticrouteandconfigureanewstaticroutewiththecorrectnexthopIPaddress.

NegatetheexistingstaticrouteandconfigureanewstaticroutewiththecorrectnexthopIPaddress.

Donothing.TheexistingstaticroutewillautomaticallyupdatethenexthopentrywiththenewIPaddress.

Keeptheexistingstaticroute,reloadtherouter,andconfigureanewstaticroutewiththecorrectnexthopIPaddres

Refertotheexhibit.Allroutersareconfiguredwithnoauto-summary.AllroutershaveadefaultrouteviatheirSerial0/1

RouterBreceivesapacketwithadestinationof8.Whatpathwillthepackettake?

B-E

B-E-D-A

B-E-D-AthenloopA-D-AuntiltheTTLexpires

Bwillimmediatelydropthepacket.

Thereisinsufficientinformationtoanswerthequestion.

27

Refertotheexhibit.Anetworkadministratorisinvestigatingwhydatapacketswithdestinationaddressesof0

00arebeingdroppedinsteadofbeingforwardedviathestaticrouteasexpected.Afterconfirmingthattheip

commandhasbeenappliedonallroutersinthenetwork,whatotheractionshouldtheadministratortaketoensurethatda

theseaddressesareforwardedviathestaticroute?

Checkthatallroutersareconfiguredwiththesameautonomoussystemnumber.

Issuethenoauto-summarycommandwithintheEIGRPconfigurationofallrouters.

Issuethenopassive-interfacecommandwithintheEIGRPconfigurationofallrouters.

Configurethestaticroutetopointtothenexthopaddressinsteadoftheoutboundinterface.

28

IfarouterisbootingwithitsdefaultconfigurationregistersettinganditsNVRAMlacksbootsystemcommands,fromwhe

routertrytoloadtheIOSimagefirst?

ROM

RAM

NVRAM

flash

TFTPserver

29TworoutersneedtobeconfiguredwithinasingleOSPFarea.Whichtwocomponentsneedtobeconfiguredonbothrout

this?(Choosetwo.)

thesameprocessID

thesameareaID

networkaddressesandwildcardmasks

thesamerouterID

thesameloopbackaddress

30

Refertotheexhibit.Packetsdestinedtowhichtwonetworkswillrequiretheroutertoperformarecursivelookup?(Choos

/8

/16

/16

/24

/24

/24

Whichcandidateroutehasthelongestmatchforapacketwithadestinationaddressof8?

/16

/23

/24

2/27

2/30

32Whichthreestatementsaretrueregardingtheencapsulationandde-encapsulationofpacketswhentravelingthroughar

(Choosethree.)

TheroutermodifiestheTTLfield,decrementingitbyone.

TherouterchangesthesourceIPtotheIPoftheexitinterface.

TheroutermaintainsthesamesourceanddestinationIP.

Therouterchangesthesourcephysicaladdresstothephysicaladdressoftheexitinterface.

TherouterchangesthedestinationIPtotheIPoftheexitinterface.

Theroutersendsthepacketoutallotherinterfaces,besidestheoneitenteredtherouteron.

33

Refertotheexhibit.TheinterfacesofallroutersareconfiguredforOSPFarea0.R3canpingR1,butthetworoutersare

establishaneighboradjacency.Whatshouldthenetworkadministratordototroubleshootthisproblem?

Checkiftheinterfacesoftheroutersareenabled.

Checkthehelloanddeadintervalsbetweentherouters.

ChecktheprocessIDofbothrouters.

CheckifCDPisenabledonalltherouters.

34Whichmechanismhelpstoavoidroutingloopsbyadvertisingametricofinfinity?

routepoisoning

splithorizon

hold-downtimer

triggeredupdates

35

Refertotheexhibit.AdeviceisrequiredtocompletetheconnectionbetweenrouterR1andtheWAN.Whichtwodevices

forthis?(Choosetwo.)

aCSU/DSUdevice

amodem

anEthernetswitch

ahub

abridge

36

Whyisfastconvergencedesirableinnetworksthatusedynamicroutingprotocols?

Hostsareunabletoaccesstheirgatewayuntilthenetworkisconverged.

Routerswillnotallowpacketstobeforwardeduntilthenetworkisconverged.

Routersmaymakeincorrectforwardingdecisionsuntilthenetworkhasconverged.

Routerswillnotallowconfigurationchangestobemadeuntilthenetworkhasconverged.

37

Refertotheexhibit.R1isconfiguredproperlyforasingleareaOSPF,andR2hasbeenrecentlyinstalledinthenetwork.

commandsisrequiredtoconfigureasingleareaOSPFforthenetworksthatareconnectedtoR2?

R2(config)#routerospf1

R2(config-router)#network55area0

R2(config-router)#networkarea0

R2(config)#routerospf1

R2(config-router)#network55area0

R2(config)#routerospf2

R2(config-router)#networkarea0

R2(config)#routerospf1

R2(config-router)#network55area0

R2(config-router)#networkarea1

R2(config)#routerospf1

R2(config-router)#network55area0

R2(config-router)#networkarea1

38

Refertotheexhibit.Whichpathwilltrafficfromthe/24networktaketogettothe/24network?

ADC

ABC

ItwillloadbalancethetrafficbetweenADCandABC

ItwillsendthetrafficviaABC,andwilluseADCasabackuppathonlywhenABCfails.

39Whataretwowaysthataroutercanlearnofthepathstodestinationnetworks?(Choosetwo.)

updatesfromotherrouters

DHCPinformationbroadcasts

manualconfigurationofroutes

ARPrequestsfromconnectedrouters

inspectionofthedestinationIPaddressindatapackets

updatesfromtheSMTPmanagementinformationbase

40

Refertotheexhibit.ThenetworkadministratorhasrunthefollowingcommandonR1.

R1(config)#iproute

Whatistheresultofrunningthiscommand?

Trafficfornetworkisforwardedto.

Thisrouteisautomaticallypropagatedthroughouttheentirenetwork.

Trafficforallnetworksisforwardedto.

Thecommandinvokesadynamicroutingprotocolfor.

Refertotheexhibit.Whatisthemeaningofthehighlightedvalue120?

Itisthemetricthatiscalculatedbytheroutingprotocol.

ItisthevaluethatisusedbytheDUALalgorithmtodeterminethebandwidthforthelink.

Itistheadministrativedistanceoftheroutingprotocol.

Itisthehold-downtime,measuredinseconds,beforethenextupdate.

42

Refertotheexhibit.ThenetworkisrunningtheRIProutingprotocol.Networkgoesdown.Whichstatementistru

howtheroutersinthistopologywillrespondtothisevent?

Router4willlearnaboutthefailedroute30secondslaterinthenextperiodicupdate.

SplithorizonwillpreventRouter4fromfowardingpacketstothenetworkuntiltheholddowntimerexpires.

Router5immediatelyflushestheunreachableroutefromitsroutingtable.

Router5willsendRouter4atriggeredupdatewithametricof16fornetwork.

43

Refertotheexhibit.WhichcombinationofIPaddressandsubnetmaskcanbeusedontheserialinterfaceofRouter2ino

interfaceinthesamenetworkastheserialinterfaceofRouter1?

IP8,subnetmask

IP5,subnetmask40

IP8,subnetmask52

IP8,subnetmask52

44WhichstatementistrueabouttheRIPv1protocol?

Itisalink-stateroutingprotocol.

Itexcludessubnetinformationfromtheroutingupdates.

ItusestheDUALalgorithmtoinsertbackuproutesintothetopologytable.

Itusesclasslessroutingasthedefaultmethodontherouter.

45

Refertotheexhibit.WhichsummarizationshouldR1usetoadvertiseitsnetworkstoR2?

/24

/24

/22

/22

Whichtwostatementsaretrueforlink-stateroutingprotocols?(Choosetwo.)

Routersthatrunalink-stateprotocolcanestablishacompletetopologyofthenetwork.

Routersinamultipointnetworkthatrunalink-stateprotocolcanexchangeroutingtables.

Routersuseonlyhopcountforroutingdecisions.

Theshortestpathfirstalgorithmisused.

Splithorizonisusedtoavoidroutingloops.

47Arouterlearnsaboutnetwork28/27frommultiplesources.Whichoptionrepresentsthebestrouteandwillb

routingtable?

S28/27[1/0]via26

R28/27[120/2]via26,00:00:14,Serial0/0/0

O28/27[110/1563]via26,00:00:09,Serial0/0/0

D28/27[90/21026560]via26,00:00:16,Serial0/0/0

48

Refertotheexhibit.Whenallofthecommandsthatareshownintheexhibitareenteredatthecorrectrouterprompt,wha

oftherouter?

name

cisco

router

hostname

49Whichstatementistrueaboutthemetricsusedbyroutingprotocols?