思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案

思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案编制仅供参考审核批准生效日期地址：电话：传真:邮编:思科认证考试（ＣＣＮＡ）考试模拟题集锦(1-71题)及答案19及答案1.[OxNx]DuringaTFTPtransferusingCiscoRouterswhatisthenumericvalue,indecimal,ofthedestinationportfieldoftheUserDatagramProtocol(UDP)headera)96

b)47

c)arandomnumberabove1024

d)69

e)noneoftheabove2.[CxNx]WhatisthestandardencapsulationmethodusedbyCiscoroutersfortheInternetProtocol(IP)onit’sEthernetinterfaces

a)SNAP

b)ARPA

c)NOVELL-ETHER

d)DARPA

e)Ethernet_802.33.[CxNx]WhatwillbethecorrectcommandonaCiscoroutertosettheIPaddressofaninterfaceassumingyouareatthe"router(config-if)#"prompt

a)ipaddress

b)ipaddress

c)ip

d)ip

e)noneoftheabove4.[CxNx]WhichcommandswilldisplaytheIPaddressesofallinterfacesonaCiscoRouter(Chooseallthatapply)

a)showiproute

b)showipaddress

c)showipinterface

d)showinterface

e)displayipaddresses5.[CxNx]WhichofthefollowingcommandswilldisplaythecontentsoftheARPcacheofyourCiscoroutera)showiparpcache

b)showiproute

c)showiparp

d)showarp

e)thereisnowaytodisplaytheARPcache6.[CxNx]ReverseAddressResolutionProtocol(RARP)istheprocess:a)WhereanIPhostresolvesit’sIPaddressbybroadcastingit’sMACaddresstothenetworkandaBOOTPserverassignsitanIPaddress.

b)WhereanIPhostresolvesit’sMACaddressbybroadcastingtothelocalnetworkit’sIPaddress.

c)WhereanIPhosttriestoresolvetheMACaddressofadestinationbysendinganetworkbroadcast.Thedestinationrespondstothebroadcastwithit’sMACaddress.

d)WhereanIPhostresolvesadestinationIPaddressbysendingabroadcastonthelocalnetworkandthedestinationhostrespondswithit’sIPaddress.

e)Thereisnosuchprocess.7.[OxNx]Whichofthefollowingapplicationsrequirestheconnection-orientedlayerfourprotocol,TCP(Chooseallthatapply)a)Telnet

b)FTP

c)TFTP

d)SNMP

e)noneoftheabove8.[RxNx]WhichofthefollowingarelinkstateRoutingProtocols.

(Chooseallthatapply.)a)IP

b)OSPF

c)RIP

d)EIGRP

e)IS-IS9.[CxNx]Ofthefollowingcommands,identifythecorrectoneforclearingtheIParptableinmemoryoftherouter.a)cleariparp-cache

b)cleariparp-table

c)cleararp-cache

d)cleararp-table

e)cleararp-ram10.[CxNx]WhichofthefollowingexplainsthecorrectdefinitionofadministrativedistanceasitpertainstoCisco’sIOSa)Theprocessbywhichroutersselectanadministratorforanautonomoussystem.

b)Theprocesswherearouterwillselectthebestpathtoadestinationnetwork.

c)Theprocesswherearouterwilldistanceitselffromotherroutersduetoit’slackofadministrativeexperience.

d)Theprocesswherearouterwillprioritizeroutingprotocolssothatintheeventtworoutingprotocolshaveconflictingnexthopaddresses,theroutingprotocolwiththelowestadministrativedistancewilltakepriority.

e)Theprocesswherearouterwillprioritizeroutingprotocolssothatintheeventtworoutingprotocolshaveconflictingnexthopaddresses,theroutingprotocolwiththehighestadministrativedistancewilltakepriority.11.[ExNx]Collisionsoccurwhena)multiplepacketsareplacedonaseriallink

b)multiplestationslistenfortrafficandtransmitatthesametime

c)whenmultipletokensareonaringsimultaneously

d)beaconingprocesstakesplace12.[RINx]HowmanysubnetsarepossiblewithaClassCaddressandasubnetmaskof52a)32

b)30

c)60

d)62

e)413.[RxNx]Whatcommandswilllistallprotocolsthatarecurrentlybeingrouted(Chooseallthatapply.)a)showipprotocol

b)showprotocol

c)showrun

d)showstart

e)Alloftheabove14.[xxNx]Whichofthefollowingaretrueofaccesslistsa)Accesslistshouldhaveatleastonepermitstatement.

b)Thelastconfiguredlineshouldalwaysbeapermitstatement.

c)Everyaccess-listwillimplicitlydenyalltraffic.

d)Access-listsareprocessedtopdown.

e)Alloftheabove.15.[xxNx]Iftheaccess-groupcommandisconfiguredonaninterfaceandthereisnoaccess-listcreatedwhichofthefollowingismostcorrecta)Anerrormessagewillappear.

b)Thecommandwillbeexecutedanddenyalltrafficout.

c)Thecommandwillbeexecutedandpermitalltrafficout.

d)Thecommandwillbeexecutedandpermitalltrafficinandout.

e)Thecommandwillbeexecutedanddenyalltrafficinandout.16.[xxNx]Whatistheresultofthecommand"access-list101permittcpany55established"a)telnetsessionswillbepermittedregardlessofthesourceaddress

b)telnetsessionswillbedeniedregardlessofthesourceaddress

c)telnetsessionswillbedeniedifinitiatedfromanyaddressotherthannetwork

d)telnetsessionswillbepermittedtothenetworkonly

e)telnetsessionswillbedeniedtothenetworkonly17.[xxNx]Whichisgenerallytrueofthelocationofaccess-lists(Chooseallthatapply.)a)Standardlistswillmostlikelybeplacedclosetothedestination.

b)Standardlistswillmostlikelybeplacedclosetothesource.

c)Extendedlistswillmostlikelybeplacedclosetothedestination.

d)Extendedlistswillmostlikelybeplacedclosetothesource.

e)Itdoesnotmatter.18.[RxNx]Whichofthefollowingismostcorrecta)IPistoTCP.asIPXistoSPX.

b)RTMPistoAppletalkasIPRIPistoIP.

c)NLSPistoIPXasOSPFistoIP.

d)aistrue.

e)bistrue.

f)a&baretrue.

g)cistrue.

h)b&caretrue.

i)a,bandcaretrue.19.[ExNx]IfHostAsendsapackettoHostBoverethernetandHostBisnotactive:a)Thepacketwilltimeout.

b)ThepacketwillberemovedbyHostA.

c)TheNVRAMofHostBwillremovethepacket.

d)Thepacketwill"die"whenitreachestheterminator.

e)Thepacketwillberemovedbythetokenmonitor.CodingKeyandInformationThefirstcharacterrepresentsthecategoryofquestion.A-ATM

B-Bridging

C-Ciscospecific

E-Ethernet

F-Framerelay

H-HDLC

I-FDDI

N-ISDN

O-OSImodel

P-PPP

R-Routing

S-Switching

T-Tokenring

X-X.25

x-NotapplicableThesecondcharacterrepresentsprotocol.A-Appletalk

B-BanyanVines

D-Decnet

I-IP

L-DialonDemand

N-NLSP

O-OSPF

X-IPX

x-NotApplicableThethirdcharacterrepresentsthecertificationthatthequestionwillhelpyoupreparefor.N-CCNAExam#640-407

P-CCNP

AdvancedCiscoRouterConfiguration(ACRC)Exam640-403

CiscoLANSwitchConfiguration(CLSC)Exam#640-404

CiscoMonitoringandTroubleshootingDial-upServicesExam#640-405

CiscoInternetworkingTroubleshooting(CIT)Exam#640-406D-CCDA&CCDP

CiscoDesignSpecialistExam#9E0-004

CiscoInternetworkDesign#640-025

Wewillreservethefourthcharacterforfutureuse.Asanexample,whenyoucomeacrossaquestioncoded"BXDx",itsignifiesaquestionthatwillhelpyougaintheCCDAorCCDPcertification.CCNA试题1-19答案1.[OxNx]DuringaTFTPtransferusingCiscoRouterswhatisthenumericvalue,indecimal,ofthedestinationportfieldoftheUserDatagramProtocol(UDP)headera)96

b)47

c)arandomnumberabove1024

d)69

e)noneoftheaboveAnswer

d)69Hereisasamplingofotherportnumbersandtheapplicationtheyareassociatedwith.Thefirst8oftheseprotocolsareautomaticallyforwardedthroughtherouterbyusingthehelper-addresscommandTrivialFileTransfer(TFTP)(port69)

DomainNameSystem(port53)

IEN-116NameServer(port42)

Timeservice(port37)

NetBIOSNameServer(port137)

NetBIOSDatagramServer(port138)

BootProtocol(BootP)clientandserverdatagrams(port67)

TACACSservice(port49)

SimpleMailTransferProtocol(25)

FileTransferProtocol(21)

SimpleNetworkManagementProtocol(161)

2.[CxNx]WhatisthestandardencapsulationmethodusedbyCiscoroutersfortheInternetProtocol(IP)onit’sEthernetinterfacesa)SNAP

b)ARPA

c)NOVELL-ETHER

d)DARPA

e)Ethernet_802.3Answer

b)ARPASNAPisthedefaultencapsulationforatokenringinterfaceNOVELL-ETHERisthedefaultencapsulationforaipxinterface.

3.[CxNx]WhatwillbethecorrectcommandonaCiscoroutertosettheIPaddressofaninterfaceassumingyouareatthe"router(config-if)#"prompta)ipaddress

b)ipaddress

c)ip

d)ip

e)noneoftheaboveAnswer

a)ipaddressIfyouarenotintheconfigurationmode,theipaddresscanbesetbyusingthesetupmode.ConfiguringinterfaceEthernet0/0:

Isthisinterfaceinuse

[yes]:

ConfigureIPonthisinterface

[yes]:

IPaddressforthisinterface[]:

Numberofbitsinsubnetfield[16]:16

ClassAnetworkis,16subnetbits;maskis/24Takenotewhenusingthesetupmodethemaskisconfiguredusingthenumberofsubnetbits.

4.[CxNx]WhichcommandswilldisplaytheIPaddressesofallinterfacesonaCiscoRouter(Chooseallthatapply)a)showiproute

b)showipaddress

c)showipinterface

d)showinterface

e)displayipaddressesAnswer

c)showipinterface

d)showinterfaceExamplesofeachofthesecommandsareshownbelow:Router_A#shinte0/0Ethernet0/0isup,lineprotocolisupHardwareisAmdP2,addressis0010.7b15.bd41(bia0010.7b15.bd41)Internetaddressis/24MTU1500bytes,BW10000Kbit,DLY1000usec,rely255/255,load1/255EncapsulationARPA,loopbacknotset,keepaliveset(10sec)ARPtype:ARPA,ARPTimeout04:00:00Lastinputnever,output00:00:06,outputhangneverLastclearingof"showinterface"countersneverQueueingstrategy:fifoOutputqueue0/40,0drops;inputqueue0/75,0drops5minuteinputrate0bits/sec,0packets/sec5minuteoutputrate0bits/sec,0packets/sec0packetsinput,0bytes,0nobufferReceived0broadcasts,0runts,0giants,0throttles,0inputerrors,0CRC,0frame,0overrun,0ignored,0abort0inputpacketswithdribbleconditiondetected127packetsoutput,11802bytes,0underruns0outputerrors,0collisions,2interfaceresets0babbles,0latecollision,0deferred0lostcarrier,0nocarrier0outputbufferfailures,0outputbuffersswappedout

Router_A#shipinte0/0Ethernet0/0isup,lineprotocolisupInternetaddressis/24Broadcastaddressis55Addressdeterminedbynon-volatilememoryMTUis1500bytesHelperaddressisnotsetDirectedbroadcastforwardingisenabledOutgoingaccesslistisnotsetInboundaccesslistisnotsetProxyARPisenabledSecuritylevelisdefaultSplithorizonisenabledICMPredirectsarealwayssentICMPunreachablesarealwayssentICMPmaskrepliesareneversentIPfastswitchingisenabledIPfastswitchingonthesameinterfaceisdisabledIPmulticastfastswitchingisenabledRouterDiscoveryisdisabledIPoutputpacketaccountingisdisabledIPaccessviolationaccountingisdisabledTCP/IPheadercompressionisdisabledProbeproxynamerepliesaredisabledGatewayDiscoveryisdisabledPolicyroutingisdisabledNetworkaddresstranslationisdisabled

5.[CxNx]WhichofthefollowingcommandswilldisplaythecontentsoftheARPcacheofyourCiscorouter

a)showiparpcache

b)showiproute

c)showiparp

d)showarp

e)thereisnowaytodisplaytheARPcacheAnswer

c)showiparpExample:

Router_A#shiparp

ProtocolAddressAge(min)HardwareAddressTypeInterface

Internet-0010.7b15.bd50ARPAFastEthernet1/0

Internet-0010.7b15.bd41ARPAEthernet0/0

6.[CxNx]ReverseAddressResolutionProtocol(RARP)istheprocess:a)WhereanIPhostresolvesit’sIPaddressbybroadcastingit’sMACaddresstothenetworkandaBOOTPserverassignsitanIPaddress.

b)WhereanIPhostresolvesit’sMACaddressbybroadcastingtothelocalnetworkit’sIPaddress.

c)WhereanIPhosttriestoresolvetheMACaddressofadestinationbysendinganetworkbroadcast.Thedestinationrespondstothebroadcastwithit’sMACaddress.

d)WhereanIPhostresolvesadestinationIPaddressbysendingabroadcastonthelocalnetworkandthedestinationhostrespondswithit’sIPaddress.

e)Thereisnosuchprocess.Answer

a)WhereanIPhostresolvesit’sIPaddressbybroadcastingit’sMACaddresstothenetworkandaBOOTPserverassignsitanIPaddress.ChoiceCdescribesAddressResolutionProtocol(ARP).Ahostneverhastoresolveit’sownMACaddress.TheMACaddressisburnedintotheNetworkInterfacecard.WhenthehostisbootedtheMACaddresswillbeloadedintomemory.

7.[OxNx]Whichofthefollowingapplicationsrequirestheconnection-orientedlayerfourprotocol,TCP(Chooseallthatapply)a)Telnet

b)FTP

c)TFTP

d)SNMP

e)noneoftheaboveAnswer

a)Telnet

b)FTPTFTPandSNMPuselayer4UDP.

8.[RxNx]WhichofthefollowingarelinkstateRoutingProtocols.

(Chooseallthatapply.)a)IP

b)OSPF

c)RIP

d)EIGRP

e)IS-ISAnswer

b)OSPF

e)IS-ISAlinkstateroutingprotocoladvertises,toit’sneighbors,thestateofthelinkwhenthestateofthelinkchanges.Adistancevectorroutingprotocoladvertisesitsroutingtableperiodically.

9.[CxNx]Ofthefollowingcommands,identifythecorrectoneforclearingtheIParptableinmemoryoftherouter.a)cleariparp-cache

b)cleariparp-table

c)cleararp-cache

d)cleararp-table

e)cleararp-ramAnswer

c)cleararp-cacheIfyouhavechangedanipaddressoraNICcardonahostyoumightusethiscommandtoresetthecache.

10.[CxNx]WhichofthefollowingexplainsthecorrectdefinitionofadministrativedistanceasitpertainstoCisco’sIOSa)Theprocessbywhichroutersselectanadministratorforanautonomoussystem.

b)Theprocesswherearouterwillselectthebestpathtoadestinationnetwork.

c)Theprocesswherearouterwilldistanceitselffromotherroutersduetoit’slackofadministrativeexperience.

d)Theprocesswherearouterwillprioritizeroutingprotocolssothatintheeventtworoutingprotocolshaveconflictingnexthopaddresses,theroutingprotocolwiththelowestadministrativedistancewilltakepriority.

e)Theprocesswherearouterwillprioritizeroutingprotocolssothatintheeventtworoutingprotocolshaveconflictingnexthopaddresses,theroutingprotocolwiththehighestadministrativedistancewilltakepriority.Answer

d)Theprocesswherearouterwillprioritizeroutingprotocolssothatintheeventtworoutingprotocolshaveconflictingnexthopaddresses,theroutingprotocolwiththelowestadministrativedistancewilltakepriority.Ciscousesadministrativedistances(AD)tomeasurethereliabilityoftheroutingprotocol.Thelowerthe(AD)themorereliabletheprotocol.Router_C#shiprouteCodes:C-connected,S-static,I-IGRP,R-RIP,M-mobile,B-BGPD-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2,E-EGPi-IS-IS,L1-IS-ISlevel-1,L2-IS-ISlevel-2,*-candidatedefaultU-per-userstaticroute,o-ODR

Gatewayoflastresortisnotset

/24issubnetted,2subnetsCisdirectlyconnected,Serial1Cisdirectlyconnected,Serial0I/8[100/8576]via,00:00:09,Serial1[100/8576]via,00:00:19,Serial0The100inboldistheadministrativedistanceforIGRP.

Apartiallistofadministrativedistancesisincludedbelow:

ProtocolAD

EIGRP90IGRP100OSPF110RIP120BGP180

IfarouterhearsaIPRIPandaIGRPupdateforthesamenetworktherouterwilldiscardtheripinformation.IPRIPuseshopcountasit’smetric,whileIGRPusesacompositemetricincludingbandwidthandload,speedistheprimaryconsideration.

11.[ExNx]Collisionsoccurwhena)multiplepacketsareplacedonaseriallink

b)multiplestationslistenfortrafficandtransmitatthesametime

c)whenmultipletokensareonaringsimultaneously

d)beaconingprocesstakesplaceAnswer

b)multiplestationslistenfortrafficandtransmitatthesametimeCollisionsisatermthatisusedinanethernetenvironment.Ethernetcanbedescribedasalistenthentransmitscenario.Firstastationwilllistenfortrafficifnotrafficissensedthenatransmissionwilltakeplace.Iftwostationstransmitatthesametimecollisionswilloccur.Thefirststationtodetectthecollisionsendsoutajammingsignaltoalertallstationsacollisionhasoccurred.Atthispointthesestationssetuparandomintervaltimerwhenthetimerexpiresre-transmissionwilloccur.Tokenringisatokenpassingprocessastationcantransmitonlywhenhehasthetoken.Therenevercanbemultipletokensonthering.EarlytokenreleaseallowsuptotwodataframestobetransmittedonatokenringLANatthesametime.Collisionsdonotoccuronatokenring.Becauseofthepointtopointnatureofseriallinkscollisionsdonotoccur.Beaconingisatermusedinatokenpassingenvironment.

12.[RINx]HowmanysubnetsarepossiblewithaClassCaddressandasubnetmaskof52a)32

b)30

c)60

d)62

e)4Answer

d)62Theabovemaskisusing6bitstodescribesubnets.Theformulausedtodeterminethenumberofsubnets(notincludingtheall0’sorall1’ssubnet)is2n-2werenisthenumberofsubnetbits.Thisisthenumbertousewhenconfiguringaipaddresswiththesetupdialog.

13.[RxNx]Whatcommandswilllistallprotocolsthatarecurrentlybeingrouted(Chooseallthatapply.)a)showipprotocol

b)showprotocol

c)showrun

d)showstart

e)AlloftheaboveAnswer

b)showprotocol

c)showrunShowipprotocolwillshowjusttheiproutingprotocolsthatarecurrentlyconfigured.Showstartmayormaynotshowthecurrentroutedprotocols.BelowistheoutputofshowprotocolRouter_B#showprotocol

Globalvalues:

InternetProtocolroutingisenabled

Appletalkroutingisenabled

BRI0isadministrativelydown,lineprotocolisdown

BRI0:1isadministrativelydown,lineprotocolisdown

BRI0:2isadministrativelydown,lineprotocolisdown

Serial0isadministrativelydown,lineprotocolisdown

Serial1isadministrativelydown,lineprotocolisdown

Serial2isadministrativelydown,lineprotocolisdown

Serial3isadministrativelydown,lineprotocolisdown

TokenRing0isadministrativelydown,lineprotocolisdown14.[xxNx]Whichofthefollowingaretrueofaccesslistsa)Accesslistshouldhaveatleastonepermitstatement.

b)Thelastconfiguredlineshouldalwaysbeapermitstatement.

c)Everyaccess-listwillimplicitlydenyalltraffic.

d)Access-listsareprocessedtopdown.

e)Alloftheabove.Answer

e)Alloftheabove.Everyaccesslisthasanimplicitdenyallattheend.Whatwouldtheneedbetocreateaaccesslistwithjustdenystatements.Access-listareprocessedfromthetopdownthereforetheorderofeachstatementcouldbecritical,forinstancesupposeyoucreatedanaccesslistandthefirstlinewasapermitanyandthenextlinewasadeny.Sinceit’stopdownprocessingapacketwouldbepermittedtopassonthefirstlineandthesecondlinewouldneverbeexecuted.Anextendedlistwillgiveyoua"matchcount"thatwillhelpindeterminingwhatthemostefficientordershouldbe.15.[xxNx]Iftheaccess-groupcommandisconfiguredonaninterfaceandthereisnoaccess-listcreatedwhichofthefollowingismostcorrecta)Anerrormessagewillappear.

b)Thecommandwillbeexecutedanddenyalltrafficout.

c)Thecommandwillbeexecutedandpermitalltrafficout.

d)Thecommandwillbeexecutedandpermitalltrafficinandout.

e)Thecommandwillbeexecutedanddenyalltrafficinandout.Answer

d)Thecommandwillbeexecutedandpermitalltrafficinandout.Therearetwostepstouseanaccesslist.1.Createthelist2.PlacetheaccesslistonainterfaceTheanalogyIuseinclassis:Supposeyouresideinagatedcommunity.Thecommunityisnotprotecteduntilyouhiretheguardandthenplacehimatthegate.Ifyouhiretheguardandneverplacehimatthegatealltrafficwillbepermitted.Whenthereisnoaccesslistonaninterfaceitisimplicitpermitany

Whenanaccesslistisplacedonainterfaceitisimplicitdenyany16.[xxNx]Whatistheresultofthecommand"access-list101permittcpany55established"a)telnetsessionswillbepermittedregardlessofthesourceaddress

b)telnetsessionswillbedeniedregardlessofthesourceaddress

c)telnetsessionswillbedeniedifinitiatedfromanyaddressotherthannetwork

d)telnetsessionswillbepermittedtothenetworkonly

e)telnetsessionswillbedeniedtothenetworkonlyAnswer

c)telnetsessionswillbedeniedifinitiatedfromanyaddressotherthannetworkThesecrettothisquestionisthekeyword"established."Establishedmeansthatthepacketwillbepermittedunlessitisthefirstpartofthethreewayhandshake.RecallthatwhenweinitiateaTCPconnectionwehavenoACK.Howcanweacknowledgeasequencenumberfromtheothersidewhenwehavenotestablishedasessionwithhim17.[xxNx]Whichisgenerallytrueofthelocationofaccess-lists(Chooseallthatapply.)a)Standardlistswillmostlikelybeplacedclosetothedestination.

b)Standardlistswillmostlikelybeplacedclosetothesource.

c)Extendedlistswillmostlikelybeplacedclosetothedestination.

d)Extendedlistswillmostlikelybeplacedclosetothesource.

e)Itdoesnotmatter.Answer

a)Standardlistswillmostlikelybeplacedclosetothedestination.

d)Extendedlistswillmostlikelybeplacedclosetothesource.Astandardlistwillonlycheckthesourceaddress.Itmakesnodifferencewherethepacketisgoing.Ifyouplaceastandardlistclosetothesourceyoucouldverywellbedenyingthattraffictogotootherdestinations.Anextendedlistcanbeplacedclosetothesourcebecausewecanpermitordenytrafficbaseduponthesourceanddestinationaddress.Thisinsuresthatonlytrafficwewishtohavedeniedisdenied.

18.[RxNx]Whichofthefollowingismostcorrecta)IPistoTCP.asIPXistoSPX.

b)RTMPistoAppletalkasIPRIPistoIP.

c)NLSPistoIPXasOSPFistoIP.

d)aistrue.

e)bistrue.

f)a&baretrue.

g)cistrue.

h)b&caretrue.

i)a,bandcaretrue.Answer

i)a,bandcaretrue.19.[ExNx]IfHostAsendsapackettoHostBoverethernetandHostBisnotactive:a)Thepacketwilltimeout.

b)ThepacketwillberemovedbyHostA.

c)TheNVRAMofHostBwillremovethepacket.

d)Thepacketwill"die"whenitreachestheterminator.

e)Thepacketwillberemovedbythetokenmonitor.Answer

d)Thepacketwill"die"whenitreachestheterminator.２０—３９及答案20.[TxNx]IfHostAsendsapackettoHostBovertokenring,andHostBisnotactive:a)Thepacketwilltimeout.

b)ThepacketwillberemovedbyHostA.

c)TheNVRAMofHostBwillremovethepacket.

d)Thepacketwill"die"whenitreachestheterminator.

e)Thepacketwillberemovedbythetokenmonitor.21.[TxNx]IfHostAsendsapackettoHostBovertokenring:HostAdiesaftertransmitting,andHostBisnotactive:a)Thepacketwilltimeout.

b)ThepacketwillberemovedbyHostA.

c)TheNVRAMofHostBwillremovethepacket.

d)Thepacketwill"die"whenitreachestheterminator.

e)ThepacketwillberemovedbytheActivemonitor.22.[FxNx]BECNandFECNare:a)UsedtoprovidekeepalivesinaFrameRelayenvironment

b)UsedtoprovideerrorcheckinginaFrameRelayenvironment

c)UsedtoprovidecongestioninformationinaFrameRelayenvironment

d)UsedtoprovideflowcontrolparametersinaFrameRelayenvironment

e)BECNandFECNarenotusedinaFrameRelayenvironment.23.[RxNx]WhichofthefollowingarebenefitsofaLink-Stateroutingprotocol(Chooseallthatapply.)a)Allowstheuseofamorerobustaddressingscheme.

b)Allowsforalargerscalablenetwork

c)Reducesconvergencetime

d)Allows"supernetting"

e)Alloftheabove.24.[OxNx]WhichofthefollowingarereasonsfortheOSImodela)Standardizesinterfaces

b)Allowsmodularengineering

c)Facilitateslearningandteaching

d)Alloftheabove.25.[RxNx]WhichofthefollowingisNOTaROUTINGprotocol:a)OSPF

b)RIP

c)IPX

d)EIGRP

e)NLSP26.[RxNx]WhichstatementisNOTtrueaboutlinkstateprotocols:a)Linkstateadvertisementsaresenttoallroutersinanarea.

b)EachrouterexecutestheSPFalgorithm.

c)Linkstaterouterskeepatopologicaldatabaseofthenetwork.

d)Linkstateroutersincludetheoriginatingroutersroutingtable.

e)Linkstateroutersknowofpossiblealternatepathstoaparticularnetwork.27.[RxNx]WhichofthefollowingwouldNOTappearinaroutingtablea)Nexthopaddress

b)InterfacePortreferences

c)MACaddress

d)Networkaddress

e)Metrics28.[OxNx]WhichstatementistrueoftheDatalinkOSIlayera)802.3istheMACsublayer.

b)Nosuchthing

c)MACsublayerprovidestheconnectiontothenetworklayer.

d)MACsublayerusesSAPStoaccessthenetworklayer.

e)SAPsublayerusestheMAClayertoaccesstheLANmedium.29.[RINx]GiventheIPaddressof3andasubnetmaskof28,whatisthesubnetaddressa)2

b)

c)3

d)28

e)Noneoftheabove.30.[CxNx]Ciscousesanamingconventiontoidentifyframetypes.WhichfourofthefollowingmappingsarecorrectCisco_name=Common_name

a)cisco_II=Ethernet_II

b)arpa=Ethernet_II

c)sap=Ethernet_802.3

d)sap=Ethernet_802.2LLC

e)NovellEther=Ethernet_802.2LLC

f)cisco_802=Ethernet_802.2LLC

g)snap=TokenRingSnap

h)snap=Ethernet_SNAP31.[RxNx]Inordertocommunicatethroughoutaninternetwork,whichofthefollowingarerequired.ChooseTwo.a)TheuseofaroutableprotocolsuchasNetBEUIorLAT

b)AhierarchicalnamingschemeserversuchasDNS

c)Ahostfileateachcommunicatingdevice

d)AtwopartnetworkaddressingschemesuchasNetwork/Host

e)TheuseofaroutableprotocolsuchasIPorIPX

f)TheuseofaroutableprotocolsuchasTCPorIPX32.[CxNx]WhatisthedefaultrouteonanIPnetworkChooseone.a)ThisistheroutethatwillbechosenfirstbyIPfordeliveryofadatagram.

b)TheaddressofthenearestdownstreamneighborinaTokenringnetwork.

c)Attherouter,itistherouteusedtodirectframesforwhichthenexthophasnotbeenexplicitlylistedintheroutingtable.

d)Anystaticroutelistinginaroutingtable.

e)Whenallconditionsareequal,thebestroutefordeliveryofIPdatagrams.33.[CxNx]Acaretsymbol(^)insertedintoafailedcommandindicateswhichofthefollowing.Chooseone.a)Numericdataisrequiredforthis