思科认证互联网专家CCIE考试(习题卷3)

试卷科目：思科认证互联网专家CCIE考试思科认证互联网专家CCIE考试(习题卷3)PAGE"pagenumber"pagenumber/SECTIONPAGES"numberofpages"numberofpages思科认证互联网专家CCIE考试第1部分：单项选择题，共222题，每题只有一个正确答案,多选或少选均不得分。[单选题]1.whichnetworkallowsdevicestocommunicatewithouttheneedtoaccesstheinternet?A)/16B)/16C)/18D)/24答案:B解析:[单选题]2.AserverrunningLinuxisprovidingsupportforvirtualmachinesalongwithDNSandDHCPservicesforasmallbusiness.Whichtechnologydoesthisrepresent?A)containerB)Type1hypervisorC)hardwarepass-throughD)Type2hypervisor答案:D解析:[单选题]3.Whichspanning-treeenhancementavoidsthelearningandlisteningstatesandimmediatelyplacesportsintheforwardingstate?A)BPDUfilterB)BackbonefastC)BPDUguardD)PortFast答案:D解析:[单选题]4.WhichDHCPmessagetypedoestheDHCPserversendtoclienttoconfirmitsallocatedIPaddress?A)DHCPDISCOVERB)DHCPOFFERC)DHCPREQUESTD)DHCPACK答案:D解析:[单选题]5.Refertotheexhibit.AnengineerconfiguresCoPPandenterstheshowcommandtoverifytheimplementation.whatistheresultoftheconfiguration?A)ICMPwillbedeniedbasedonthisconfigurationB)Iftrafficexceedsthespecifiedrate,itwillbetransmittedandremarkedC)Class-defaulttrafficwillbedroppedD)Alltrafficwillbepolicedonaccess-list120答案:D解析:[单选题]6.onwhichporttypewouldyouconfigureSTPportfastBPDUguard?A)ROOTPORTSB)DESIGNATEDPORTSC)HOSTPORTSD)ALTERNATEPORTS答案:C解析:[单选题]7.WhichQoScomponentaltersapackettochangethewaythattrafficistreatedinthenetwork?A)MarkingB)ClassificationC)ShapingD)Policing答案:A解析:[单选题]8.Bydefault,whichvirtualMACaddressdoesHSRPgroup32use?A)00:5e:0c:07:ac:20B)04:18:20:83:2e:32C)05:5e:5c:ac:0c:32D)00:00:0c:07:ac:20答案:D解析:[单选题]9.WhichvaluedoesVPLSusetomakeforwardingdecisions?A)destinationIPaddressofthepacketB)destinationMACoftheEthernetFrameC)sourceIPaddressofthepacketD)sourceMACoftheEthernetframe答案:B解析:[单选题]10.dwhichmechanismdocsgetvpnusetopreserveipheaderinformation?A)GREB)MPLSC)IPSECTRANSPORTMODED)IPSECTUNNELMODE答案:D解析:[单选题]11.Ascriptcontainsthestatement?whileloop!=999:?.Whichvalueterminatestheloop?A)Avaluelessthenorequalto999B)Avaluegreaterthenorequalto999C)Avaluenotequalto999D)Avalueequalto999答案:D解析:[单选题]12.WhichcongestionqueuingmethodonCiscoIOSbasedroutersusesfourstaticqueues?A)lowlatencyB)customC)weightedfairD)Priority答案:D解析:[单选题]13.WhatdoesanorthboundAPIaccomplish?A)programmaticcontrolofabstractednetworkresourcesthroughacentralizedcontrollerB)accesstocontrollednetworkresourcesfromacentralizednodeC)communicationbetweenSDNcontrollersandphysicalswitchesD)controlledaccesstoswitchesfromautomatedsecurityapplications答案:A解析:通过集中控制器对抽象的网络资源进行程序化控制[单选题]14.YouhaveconfiguredarouterwithanOSPFrouterID,butitsIPaddressstillreflectsthephysicalinterface.Whichactioncanyoutaketocorrecttheproblemintheleastdisruptiveway?A)ReloadtheOSPFprocessB)SpecifyaloopbackaddressC)Reboottherouter.D)Savetherouterconfiguration答案:B解析:您已经使用OSPF路由器ID配置了一个路由器，但是它的IP地址仍然反映了物理接口。您可以采取哪些措施以最少的中断方式解决问题？b.指定环回地址[单选题]15.Whywouldalogfilecontaina*nexttothedate?A)ThenetworkdeviceisnotconfiguredtouseNTPtimestampsforloggingB)ThenetworkdevicewasunabletoreachtheNTPserverwhenthelogmessageswererecorded.C)ThenetworkdeviceisnotconfiguredtouseNTPD)ThenetworkdevicewasreceivingNTPtimewhenthelogmessageswererecorded答案:B解析:[单选题]16.Refertotheexhibit.Witchstatementcorrectlydescribesarouterwiththisconfigurationtreatspacketsthatmatchaccess-list144ifitdoesnotknowapathto,anddoesnotknowapathto?A)ItsendsanICMPsourcequenchmessage.B)Itroutesthepacketbasedonthepacket'sdestinationusingtheroutingtable.C)ItroutesthepacketintoaloopanddropsitwhentheTTLreacheszero.D)Itdropsthepacketimmediately.答案:B解析:[单选题]17.IfOSPFisrunningonthisnetwork,howdoesRouter2handletrafficfromSiteBto10.10.13/25atSiteA?class="fr-ficfr-dibcursor-hover"A)ItsendspacketsoutofinterfaceFa0/2onlyB)<li>ItsendspacketsoutofinterfaceFa0/1only.</li>C)<li>Itcannotsendpacketsto10.10.13128/25</li>D)<li>Itload-balancestrafficoutofFa0/1andFa0/2</li>答案:C解析:Router2doesnothaveanentryforthesubnet28/25.Itonlyhasanentryfor/25,whichrangesfromto27.[单选题]18.WhenistheDesignworkflowusedinCiscoDNACenter?A)inagreenfielddeployment,withnoexistinginfrastructureB)inagreenfieldorbrownfielddeployment,towipeoutexistingdataC)inabrownfielddeployment,tomodifyconfigurationofexistingdevicesinthenetworkD)inabrownfielddeployment,toprovisionandonboardnewnetworkdevices答案:A解析:在一个没有现有基础设施的新领域部署[单选题]19.BasedontheLACPneighborstatus,inwhichmodeistheSW1portchannelconfigured?class="fr-ficfr-dibcursor-hover"A)<li>passive</li>B)<li>modeon</li>C)<li>auto</li>D)<li>Active</li>答案:D解析:SP的P:代表邻居处于被动模式，为了创建以太通道接口，SW1应该为活动模式0x3c=00111100，第三位1表示活动模式[单选题]20.WhichNGFWmodeblocksflowscrossingthefirewall?A)tapB)inlineC)passiveD)inlinetap答案:B解析:[单选题]21.HowdoTCPandUDPdifferinthewaytheyprovidereliabilityfordeliveryofpackets?A)TCPisaconnectionlessprotocolthatdoesnotprovidereliabledeliveryofdata,UDPisaconnection-orientedprotocolthatusessequencingtoprovidereliabledelivery.B)TCPdoesnotguaranteedeliveryorerrorcheckingtoensurethatthereisnocorruptionofdataUDPprovidesmessageacknowledgementandretransmitsdataiflost.C)TCPprovidesflowcontroltoavoidoverwhelmingareceiverbysendingtoomanypacketsatonce,UDPsendspacketstothereceiverinacontinuousstreamwithoutcheckingforsequencingD)TCPuseswindowingtodeliverpacketsreliably;UDPprovidesreliablemessagetransferbetweenhostsbyestablishingathree-wayhandshake答案:C解析:[单选题]22.Whatwouldbethepreferredwaytoimplementalooplessswitchnetworkwherethereare1500definedVLANsanditisnecessarytoloadthesharedtrafficthroughtwomainaggregationpointsbasedontheVLANidentifier?A)802.1DB)802.1sC)802.1WD)802.1AE答案:B解析:[单选题]23.Whateventhasoccurredifaroutersendsanoticelevelmessagetoasyslogserver?A)ATCPconnectionhasbeenturndownB)AnICMPconnectionhasbeenbuiltC)AninterfacelinehaschangedstatusD)Acertificatehasexpired.答案:C解析:[单选题]24.WhatisonecharacteristicoftheCiscoSD-Accesscontrolplane?A)ItstoresremoteroutesinacentralizeddatabaseserverB)EachrouterprocesseseverypossibledestinationandrouteC)ItallowshostmobilityonlyinthewirelessnetworkD)ItisbasedonVXLANtechnology答案:A解析:[单选题]25.Whichdevicemakesthedecisionforawirelessclienttoroam?A)wirelessclientB)accesspointC)wirelessLANcontrollerD)WCSlocationserver答案:A解析:[单选题]26.WhatisusedtoperformQoSpacketclassification?A)theOptionsfieldintheLayer3headerB)theTypefieldintheLayer2frameC)theFlagsfieldintheLayer3headerD)theToSfieldintheLayer3header答案:D解析:[单选题]27.whatoccurstoframesduringtheprocessofframeflooding?A)FramesaresenttoeveryportontheswitchinthesameVLANexceptfromtheoriginatingportB)FramesaresenttoeveryportontheswitchthathasamatchingentryintheMACaddresstable.C)Framesaresenttoallports,includingthosethatareassignedtootherVLANs.D)FramesaresenttoeveryportontheswitchinthesameVLAN.答案:A解析:[单选题]28.Ifthenetworkenvironmentisoperatingnormally,whichtypeofdevicemustbeconnectedtointerfaceFastEthernet0/1?class="fr-ficfr-dibcursor-hover"A)DHCPclientB)accesspointC)routerD)PC答案:C解析:[单选题]29.Refertotheexhibit.Whichstatementistrue?A)THEOUTPUTSHOWSANIPV6MULTICASTADDRESSWITHLINK-LOCALSCOPE.B)THEOUTPUTSHOWSANIPV6MULTICASTADDRESSTHATISUSEDFORUNIQUELOCALSOURCESONLY.C)THEOUTPUTSHOWSANIPV6MULTICASTADDRESSTHATCANBEUSEDFORBIDIR-PIMONLY.D)THEOUTPUTSHOWSAILIPV6MULTICASTADDRESSWITHEMBEDDEDRP.答案:D解析:[单选题]30.Afloatingstaticrouteappeal'sintheroutingtableofauinterfaceevenwhentheinterfaceisunusable.Whichactioncanyoutaketocorrecttheproblem?A)REMOVETHEPERMANENTOPTIONFROMTHESTATICROUTERB)CORRECTTHEADMINISTRATIVEDISTANCE.C)CONFIGURETHEFLOATINGSTATICROUTETOPOINTTOANOTHERINTHEROUTINGTABLE.D)CORRECTTHEDHCP-PROVIDEDROUTEONTHEDHCPSERVER.答案:A解析:[单选题]31.Whichunitisusedtoexpressthesignal-to-noseratio?A)MwB)AmpC)DbD)Dbm答案:C解析:[单选题]32.Aresponsecodeof404isreceivedwhileusingtheRESTAPIonCiscoDNACentertoPOSTtothisURL/dna/intent/api/v1/template-programmer/projectWhatdoesthecodemean?A)TheclientmadearequestaresourcethatdoesnotexistB)TheserverhasnotimplementedthefunctionalitythatisneededtofulfilltherequestC)Therequestacceptedforprocessing,buttheprocessingwasnotcompletedD)ThePOST/PUTrequestwasfulfilledandanewresourcewascreated,informationabouttheresourceisintheresponsebody答案:A解析:[单选题]33.WhichoutcomeisachievedwiththisPythoncode?ect(ip,port=22,username=usr9passwordspswd)Stdin,stdout,stderr=client.exec_command('showipbgpbestpathin')print(stdout)A)connectstoaCiscodeviceusingSSHandexportstheroutingtableinformationB)connectstoaCiscodeviceusingSSHandexportstheBGPtablefortheprefixC)connectstoaCiscodeviceusingTelnetandexportstheroutingtableinformationD)displaystheoutputoftheshowcommandinaformattedway答案:B解析:[单选题]34.youareconfiguringcos-to-DSCPmappingswiththreerequirementsCOS1mustbetranslatedintoAP13COS2mustbetranslatedintoAF22COS5mustbetranslatedintoEFWhichconfigurationcommandcanyouusetoimplementtherequirements?A)MLSQOSMAPCOS-DSCP014202432464856B)MLSQOSMAPCOS-DSCP012182432464856C)MLSQOSMAPCOS-DSCP012182432404856D)MLSQOSMAPCOS-DSCP012182432464856答案:A解析:[单选题]35.WhichTCPsettingistunedtominimizetheriskoffragmentationonaGRE/IPtunnel?A)MSSB)MTUC)MRUD)windowsize答案:A解析:[单选题]36.Howdoclouddeploymentsdifferfromon-premdeployments?A)Clouddeploymentsrequirelongerimplementationtimesthanon-premisesdeploymentsB)Clouddeploymentsaremorecustomizablethanon-premisesdeployments.C)Clouddeploymentshavelowerupfrontcoststhanon-premisesdeployments.D)Clouddeploymentsrequirelessfrequentupgradesthanon-premisesdeployments.答案:C解析:[单选题]37.HowisthenativeVLANsecuredinanetwork?A)separatefromotherVLANswithintheadministrativedomainB)giveitavalueintheprivateVLANrangeC)assignitasVLAN1D)configureitasadifferentVLANIDoneachendofthelink答案:D解析:[单选题]38.WhatdoesthenumberinanNTPstratumlevelrepresent?A)Thenumberofhopsittakestoreachthemastertimeserver.B)Theamountofdriftbetweenthedeviceclockandtruetime.C)Theamountofoffsetbetweenthedeviceclockandtruetime.D)Thenumberofhopsittakestoreachtheauthoritativetimesource.答案:D解析:[单选题]39.?HTTP/1.1204content?isreturnedwhencur-l-xDELETEcommandisissued.WhichSituationhasoccurred?A)TheobjectcouldnotbelocatedattheURIpathB)ThecommandsucceededindeletingtheobjectC)TheobjectwaslocatedattheURI,butitcouldnotbedeletedD)TheURIwasinvalid答案:B解析:[单选题]40.WhichIPv6migrationmethodreliesondynamictunnelsthatusethe2002::/16reservedaddressspace?A)6RDB)6TO4C)ISATAPD)GRE答案:B解析:[单选题]41.ApacketisbeingsentacrossrouterR1tohost4.Towhichdestinationdoestheroutersendthepacket?class="fr-ficfr-dibcursor-hover"A)46viaSerial0/1/0B)54viaSerial0/0/1C)54viaSerial0/0/0D)50viaSerial/0/0/0答案:B解析:[单选题]42.Whichtopologyallowsthesplit-horizonruletobesafelydisabledwhenusingEIGRP?A)fullmeshB)partialmeshC)hubandspokeD)ring答案:C解析:[单选题]43.HHTTP/1.1204NoContent"isreturnedwhenthecurl-i・XDELETEcommandisissued.Whichsituationhasoccurred?A)TheobjectcouldnotbelocatedattheURIpath.B)TheURIwasinvalid.C)Thecommandsucceededindeletingtheobject.D)TheobjectwaslocatedattheURI,butitcouldnotbedeleted.答案:C解析:[单选题]44.R1haslearnedroute/24vianumerousroutingprotocols.Whichrouteisinstalled?A)routewiththelowestcostB)routewiththenexthopthathasthehighestIPC)routewiththeshortestprefixlengthD)routewiththelowestadministrativedistance答案:D解析:[单选题]45.AfteraredundantrouteprocessorfailureoccursonaLayer3device,whichmechanismallowsforpacketstobeforwardedfromaneighboringrouterbasedonthemostrecenttables?A)RPVST+B)RPfailoverC)BFDD)NSF答案:D解析:[单选题]46.HowdotheRIBandtheFIBdiffer?A)RIBcontainstheinterfaceforadestination,andtheFIBcontainsthenexthopinformationB)FIBcontainsrouteslearnedthroughadynamicroutingprotocol,andtheRIBcontainsroutesthatarestaticordirectlyconnectedC)RIBisderivedfromthecontrolplane,andtheFIBisderivedfromtheRIBD)FIBisderivedfromthecontrolplane,andtheRIBisderivedfromthedataplane答案:C解析:[单选题]47.whichcircumstanceisacommoncauseoflatecollisions?A)nativeVLANmismatchB)overloadedhardwarequeuesC)duplexmismatchD)softwaremisconfiguration答案:C解析:哪种情况是晚点碰撞的常见原因？c.双工不匹配[单选题]48.WhichMACprotocolsetsarandomtimertoreattemptcommunication?A)RARPB)CSMA/CAC)CSMA/CDD)IEEE802.1x答案:C解析:哪个MAC协议设置了一个随机计时器来重新尝试通信?CCSMA/CD[单选题]49.Howis802.11traffichandledinafabric-enabledSSID?A)convertedbytheAPinto802.3andencapsulatedintoaVLANB)centrallyswitchedbacktoWLCwheretheusertrafficismappedtoaVXLANontheWLCC)centrallyswitchedbacktoWLCwheretheusertrafficismappedtoaVLANontheWLCD)convertedbytheAPinto802.3andencapsulatedintoVXLAN答案:D解析:[单选题]50.Inathree-tierhierarchicalcampusnetworkdesign,whichactionisadesignbest-practiceforthecorelayer?A)provideQoSprioritizationservicessuchasmarking,queueing,andclassificationforcriticalnetworktrafficB)provideadvancednetworksecurityfeaturessuchas802.IX,DHCPsnooping,VACLs,andportsecurityC)provideredundantLayer3point-to-pointlinksbetweenthecoredevicesformorepredictableandfasterconvergenceD)provideredundantaggregationforaccesslayerdevicesandfirst-hopredundancyprotocolssuchasVRRP答案:C解析:[单选题]51.WhichOSPFnetworktypesarecompatibleandallowcommunicationthroughthetwopeeringdevices?A)broadcasttononbroadcastB)point-to-multipointtononbroadcastC)broadcasttopoint-to-pointD)point-to-multipointtobroadcast答案:A解析:[单选题]52.WhatisabenefitofdatamodelinglanguageslikeYANG?A)TheycreatemoresecureandefficientSNMPOIDs.B)Theyprovideastandardizeddatastructure,whichresultsinconfigurationscalabilityandconsistency.C)Theyenableprogrammerstochangeorwritetheirownapplicationswithinthedeviceoperatingsystem.D)TheymaketheCLIsimplerandmoreefficient.答案:B解析:[单选题]53.Bydefault,whichvirtualMACaddressdoesHSRPgroup22use?A)00:00:0c:07:ac:16B)c0:07:0c:ac:00:22C)00:00:0c:07:ac:22D)cO:XX:XX:XX:XX:16答案:A解析:[单选题]54.WhichbenefitisrealizedbyimplementingSSO?A)IPfirst-hopredundancyB)communicationbetweendifferentnodesforclustersetupC)physicallinkredundancyD)minimalnetworkdowntimefollowinganRPswitchover答案:D解析:[单选题]55.WhichcontrolplaneprotocolisusedbetweenCiscoSD-WANroutersandvSmartcontrollers?A)BGPB)OMPC)TCPD)UDP答案:B解析:[单选题]56.Whichdevicecontrolstheforwardingofauthenticationrequestsforuserswhenconnectingtothenetworkusingalightweightaccesspoint?A)TACACSserverB)wirelessaccesspointC)RADIUSserverD)wirelessLANcontroller答案:B解析:[单选题]57.whichTCPfeatureallowsaclienttorequestaspecificpacketthatwaslost?A)FLOWCONTROLB)SLIDINGWINDOWC)FASTRECOVERYD)SELECTIVEACKNOWLEDGMENT答案:D解析:[单选题]58.WhichtechnologydoesCiscoPfRusetocollectpassivemonitoringstatics?A)NBARB)SNMPC)SYSLOGD)NETFLOW答案:D解析:[单选题]59.Anofficehas8floorswithapproximately30-40usersperfloor.WhatcommandmustbeconfiguredontherouterSwitchedVirtualInterfacetouseaddressspaceefficiently?A)ipaddressB)ipaddressC)ipaddress28D)ipaddress24答案:B解析:8个子网，选择B[单选题]60.WhichreasoncouldcauseanOSPFneighborshiptobeintheEXSTART/EXCHANGEstate?A)MismatchedOSPFnetworktypeB)MismatchedareasC)MismatchedMTUsizeD)MismatchedOSPFlinkcosts答案:C解析:[单选题]61.Bydefault,whichvirtualMACaddressdoesHSRPgroup16use?A)c0:41:43:64:13:10B)00:00:0c:07:ac:10C)05:00:0c:07:ac:16D)00:05:5c:07:0c:16答案:B解析:[单选题]62.whatisthesourceMACaddressofaBPDUframethatissentoutofaport?A)THELOWESTMACADDRESSONTHESWITCHB)THEHIGHESTMACADDRESSONTHESWITCHC)THEMACADDRESSOFTHEINDIVIDUALPORTTHATISSENDINGTHEBPDUD)THESAMEASTHEMACADDRESSINTHEBRIDGEID答案:C解析:[单选题]63.WhichoptiondescribesthecharacteristicsofapublicInfrastructureasaServicecloudservicemodel?A)Itisawayofdeliveringcloud-computinginfrastructure(servers,storage,network,andoperatingsystems)asanon-demandservice.B)Itisacloud-computingplatformthatfacilitatesthecreationofwebapplicationswithouttheneedtomaintainthesupportingsoftwareapplications.C)Itisacloudservicewheretheunderlyinghardwareismanagedbythecloudserviceprovider.D)Itisacloud-computingplatformthatfacilitatesthecreationofwebapplicationswithouttheneedtomaintainthesupportingsoftwareoperatingsystems.答案:A解析:[单选题]64.HowarctheCiscoExpressForwardingtableandtheFIBrelatedtoeachother?A)THEFIBISUSEDTOPOPULATETHECISCOEXPRESSFORWARDINGTABLE.B)THECISCOEXPRESSFORWARDINGTABLEALLOWSROUTELOOKUPSTOBEFORWARDEDTOTHEROUTEPROCESSORFORPROCESSINGBEFORETHEYAREC)THERECANBEONLYONEFIBBUTMULTIPLECISCOEXPRESSFORWARDINGTABLESONIOSDEVICES.D)CISCOEXPRESSFORWARDINGUSESAFIBTOMAKEIPDESTINATIONPREFIX-BASEDSWITCHINGDECISIONS.答案:D解析:[单选题]65.Which802.11frametypeisassociationresponse?A)managementB)protectedframeC)controlD)action答案:A解析:[单选题]66.Insoftwaredefinedarchitectures,whichplaneisdistributedandresponsiblefortrafficforwarding?A)managementplaneB)controlplaneC)policyplaneD)dataplane答案:D解析:[单选题]67.WhentheactiverouterinanHSRPgroupfails,whatrouterassumestherole（角色）andforwardspackets?A)backupB)standbyC)listeningD)forwarding答案:B解析:[单选题]68.accordingtothenetworkingbestpractices,whichnetworkdeviceshouldbeusedforoptimizationandratelimiting?A)THEPROVIDERCOREDEVICEB)THEPROVIDEREDGEDEVICEC)THECUSTOMERCOREDEVICED)THECOUSTOMEREDGEDEVICE答案:D解析:[单选题]69.WhichAPIisusedincontroller-basedarchitecturestointeractwithedgedevices?A)overlayB)northboundC)underlayD)southbound答案:D解析:[单选题]70.Whichbenefitisofferedbyacloudinfrastructuredeploymentbutislackinginanon-premisesdeployment?A)efficientscalabilityB)virtualizationC)storagecapacityD)supportedsystems答案:A解析:[单选题]71.Acompanyplanstoimplementintent-basednetworkinginitscampusinfrastructure.WhichdesignfacilitiesamigratefromatraditionalcampusdesigntoProgrammerfabricdesigner?A)Layer2accessB)Three-tierC)Two-tierD)Routedaccess答案:C解析:[单选题]72.WhatcommandcanyouenteronaCiscoroutersothatitcanbothpollatimeserverandbepolledbyatimeserver?A)NTPSERVERB)NTPBROADCASTCLIENTC)NTPBROADCASTDESTINATIOND)NTPPEER答案:D解析:[单选题]73.WhatisfactaboutCiscoSD-accesswirelessnetworkinfrastructuredeployments?A)Theaccesspointispartofthefabricoverlay.B)Thewirelessclientispartofthefabricoverlay.C)Theaccesspointispartofthefabricunderlay.D)TheWLCispartofthefabricunderlay.答案:A解析:[单选题]74.ThefollowingsystemlogmessageispresentedafteranetworkadminisrraiorconfiguresaGREtunnel%TUN-RECURDOWNInterfaceTunnel0temporarilydisabledduetorecursiveroutingWhyisTunnel0disabled?A)BecausedynamicroutingisnotenabledB)BecausetheroutercannotrecursivelyidentifVitsegressforwardinginterfacC)BecausethebestpathtothetunneldestinationisthroughthetunnelitselfD)Becausethetunnelcannotreachitstunneldestination.答案:C解析:[单选题]75.RouterR1isrunningthreedifferentroutingprotocols.WhichroutecharacteristicisusedbytheroutertoforwardthepacketthatitreceivesfordestinationIP?class="fr-ficfr-dibcursor-hover"A)longestprefixB)<li>metric</li>C)costD)administrativedistance答案:A解析:[单选题]76.AftertheswitchconfigurationthepingtestfailsbetweenPCAandPCBBasedontheoutputforswitch1.whicherrormustbecorrected?class="fr-ficfr-dibcursor-hover"A)ThereisanativeVLANmismatchB)AccessmodeisconfiguredontheswitchportsC)ThePCsaremtheincorrectVLAND)AllVLANsarenotenabledonthetrunk答案:A解析:[单选题]77.howdocsMSTPmaintaincompatibilitywithRSTP?A)RSTPIMPLEMENTSATTLTHATISCOMPATIBLEWITHTHEMSTPMAXAGETIMER.B)MSTPSUPPORTSFIVEPORTSTATESINTHESAMEWAYASRSTP.C)MSTPSENDSALLSPANNING-TREEINFORMATIONINONEBPDU.D)RSTPENCODESREGIONINFORMATIONFROMANMSTPBPDUINTOASINGLEINSTANCE.答案:C解析:[单选题]78.Basedonthisinterfaceconfiguration,whatistheexpectedstateofOSPFadjacency?A)2WAY/DROTHERonbothroutersB)notestablishedC)FULLonbothroutersD)FULL/BDRonR1andFULL/BDRonR2答案:B解析:[单选题]79.Whichinteriorgatewayprotocolisbasedonopenstandardsusesashortest-pathfirstalgorithm.providesnativeprotocols,andoperatesatthedatalinklayer?A)IS-ISB)EIGRPC)BGPD)OSPF答案:A解析:[单选题]80.WhenaWPA2-PSKWLANisconfiguredinthewirelessLANController,whatistheminimumnumberofcharacters（thatinASCllformat?A)6B)8C)12D)18答案:B解析:[单选题]81.AtwhichlayerdoesCiscoDNACentersupportRESTcontrols?A)EEMappletsorscriptsB)SessionlayerC)YMALoutputfromresponsestoAPIcallsD)NorthboundAPIs答案:D解析:[单选题]82.WhichoutcomeisachievedwiththisPythoncode?Client.connect(ip,port=22,username=usr,password=pswd)Stdin,stdout,stderr=client.exec_command('showipbgpbestpathin')Print(stdout)A)ConnectstoaCiscodeviceusingSSHandexportstheBGPtablefortheprefixB)ConnectstoaCiscodeviceusingSSHandexportstheroutingtableinformationC)DisplaystheoutputoftheshowcommandinaformattedwayD)ConnectstoaCiscodeviceusingTelnetandexportstheroutingtableinformation答案:A解析:[单选题]83.yournetflowcollectorisnotworkingduetoalargeamountoftrafficenteringyournetworkwhichisdestinedtoasingleIPaddress.Whichnetflowfeatureallowsyoutocollectthetopsourcehostsforthistrafficonthelocalrouter?A)ANETFLOWCANEXPORTFLOWSONLYTOAEXTERMALFLOWCOLLECTORB)SHOWIPCACHEFLOWC)IPACCOUNTINGD)IPFLOW-TOP-TALKERS答案:D解析:[单选题]84.WhichstepintherouterbootprocesssearchesforanIOSimagetoloadintotherouter?A)bootstrapB)POSTC)mini-IOSD)ROMMONmode答案:A解析:路由器引导过程中的哪个步骤搜索要加载到路由器中的IOS映像?A引导[单选题]85.AcompanyhasanexistingCisco5520HAclusterusingSSO.AnengineerdeploysanewsingleCiscoCatalyst9800WLCtotestnewfeatures.Theengineersuccessfullyconfiguresamobilitytunnelbetweenthe5520clusterand9800WLC.ClientsconnectedtothecorporateWLANroamseamlesslybetweenaccesspointsonthe5520and9800WLC.Afterafailureontheprimary5520WLC,allWLANservicesremainfunctional;howeverclientscannotroambetweenthe5520and9800controllerswithoutdroppingtheirconnection.Whichfeaturemustbeconfiguredtoremedytheissue?A)mobilityMAConthe5520clusterB)mobilityMAConthe9800WLCC)newmobilityonthe5520clusterD)newmobilityonthe9800WLC答案:B解析:[单选题]86.HowdoesCiscoTrustSecenablemoreflexibleaccesscontrolsfordynamicnetworkingenvironmentsanddatacenters?A)usesflexibleNetFlowB)assignsaVLANtotheendpointC)classifiestrafficbasedonadvancedapplicationrecognitionD)classifiestrafficbasedonthecontextualidentityoftheendpointratherthanitsIPaddress答案:D解析:[单选题]87."HTTP/1.1204NoContent"isreturnedwhenthecurl-i・XDELETEcommandisissued.Whichsituationhasoccurred?A)Thecommandsucceededindeletingtheobject.B)TheobjectcouldnotbelocatedattheURIpath.C)TheobjectwaslocatedattheURI,butitcouldnotbedeleted.D)TheURIwasinvalid.答案:A解析:[单选题]88.whichinteriorgatewayprotocolisbasedonopenstandardsusesashortest-pathfirstalgorithm.Providesnativeprotocols,andoperatesatthedatalinklayer?A)IS-ISB)EIGRPC)BGPD)OSPF答案:A解析:[单选题]89.WhattheroleofafusioninanSD-Accesssolution?A)providesconnectivitytoexternalnetworksB)actsasaDNSserverC)performsrouteleakingbetweenuser-definedvirtualnetworksandsharedservicesD)providesadditionalforwardingcapacitytothefabric答案:C解析:[单选题]90.Whichimplementationprovidesthestrongestencryptioncombinationforthewirelessenvironment?A)WPA2+AESB)WPA+AESC)WEPD)WPA+TKIP答案:A解析:[单选题]91.WhichCRUDoperationcorrespondstotheHTTPGETmethod?A)readB)updateC)createD)delete答案:A解析:[单选题]92.WhichIPSLAoperationtypeusesIPtomeasuretheround-triptimebetweenarouterandadevice?A)HTTPB)ICMPECHOC)ICMPPATHJITTERD)UDPJITTERFORVOIP答案:B解析:[单选题]93.HowcananengineerpreventbasicreplayattacksfrompeoplewhotrytobruteforceasystemviaRESTAPI?A)AddatimestamptotherequestIntheAPIheader.B)UseapasswordhashC)AddOAuthtotherequestintheAPIheader.D)UseHTTPS答案:A解析:[单选题]94.whichstatementaboutauto-RPistrue?A)ALLINTERFACESMUSTBECONFIGUREDINSPARSEMODE.B)ALLINTERFACESMUSTBECONFIGUREDINSPARSE-DENSEMODE.C)ALLINTERFACESMUSTBECONFIGUREDINDENSEMODED)AILRPTHATITTIEDTOALOOPBACKADDRESSMUSTBECONFIGURED.答案:D解析:[单选题]95.HowdocsMSTPmaintaincompatibilitywithRSTP?A)RSTPIMPLEMENTSATTLTHATISCOMPATIBLEWITHTHEMSTPMAXAGETIMER.B)MSTPSUPPORTSFIVEPORTSTATESINTHESAMEWAYASRSTP.C)MSTPSENDSALLSPANNING-TREEINFORMATIONINONEBPDU.D)RSTPENCODESREGIONINFORMATIONFROMANMSTPBPDUINTOASINGLEINSTANCE.答案:C解析:[单选题]96.Whendoesastackmasterloseitsrole?A)WhenthepriorityvalueofastackmemberischangedtoahighervalueB)WhenaswitchwithahigherpriorityisaddedtothestackC)WhenthestackmasterisresetD)Whenastackmemberfails答案:C解析:[单选题]97.Whichtechnologyusesnetworktraffictelemetry,contextualinformation,andfilereputationToprovideinsightintocyberthreats?A)threatdefenseB)securityservicesC)securityintelligenceD)segmentation答案:A解析:威胁防御[单选题]98.WhichstatementaboutCiscoExpressForwardingaretrue?A)THEFIBTABLERESIDESONTHEROUTEPROCESSORANDTHEADJACENCYTABLERESIDESONTHELINECARDSWHENCISCOEXPRESSFORWARDINGISENABLED.B)THEFIBTABLEANDTHEADJACENCYTABLERESIDEONTHELINECARDSWHENCISCOEXPRESSFORWARDINGISENABLED.C)LAYER2NEXT-HOPADDRESSINFORMATIONISMAINTAINEDINTHEADJACENCYTABLE.D)LAYER2NEXT-HOPADDRESSINFORMATIONISMAINTAINEDINTHEFIBTABLE.答案:C解析:[单选题]99.Whichvariableinan