思科认证互联网专家CCIE考试(习题卷2)

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2)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.WhichprotocolisusedtoencryptcontrolplanetrafficbetweenSD-WANcontrollersandSD-WANendpoints?A)DTLSB)IPsecC)PGPD)HTTPS答案:A解析:[单选题]2.whatcommandcanyouenteronaciscoroutersothatitcanbothpollatimeserverandbepolledbyatimeserver?A)NTPSERVERB)NTPBROADCASTCLIENTC)NTPBROADCASTDESTINATIOND)NTPPEER答案:D解析:[单选题]3.InaDMVPNsolutionwhichcomponentcantheGREtumidsourceanddestinationgenerateautomatically?A)PRE-SHAREDKEYSB)CRYPTOACLSC)QOSMARKINGSD)POLICYMAPS答案:B解析:[单选题]4.InCiscoSD-WAN,whichprotocolisusedtomeasurelinkquality?A)OMPB)BFDC)RSVPD)IPsec答案:B解析:[单选题]5.Toincreasetotalthroughputandredundancyonthelinksbetweenthewirelesscontrollerandswitch,thecustomerenabledLAGonthewirelesscontroller.WhichEtherChannelmodemustbeconfiguredontheswitchtoallowtheWLCtoconnect?A)ActiveB)PassiveC)OnD)Auto答案:C解析:[单选题]6.WithwhichprotocolisCoAPdesignedtobeused?A)TCPB)UDPC)XMPPD)SNMP答案:B解析:[单选题]7.AnetworkmonitoringsystemusesSNMPpollingtorecordthestatisticsofrouterinterfacesTheSNMPquernsworkasexpectedunbranengineerinstallsanewinterfaceandreloadstherouterAfterthisaction.allSNMPqueriestortherouterfailWhatisthecauseofthisIssue?A)TheSNMPservertrapsaredisabedtortheinterfaceindexB)TheSNMPcommunityiscontiguredincorrectlyC)TheSNMPirterfaceindexchangedafterrebootD)TheSNMPservertrapsaredisabledforthelinkstate答案:C解析:日志含义重启后SNMP接口索引发生变化[单选题]8.WhichIS-ISprocessisresponsibleforfloodinglocallinkinformationtoadjacentrouters?A)DECISIONB)RECEIVEC)FORWARDD)UPDATE答案:D解析:[单选题]9.WhatIstheprocessformovingavirtualmachinefromonehostmachinetoanotherwithnodowntime?A)HighavailabilityB)DisasterrecoveryC)livemigrationD)Multisitereplication答案:C解析:[单选题]10.WhereareoperationsrelatedtosoftwareimageslocatedintheCiscoDNACenterGUI?A)ServicesB)DesignC)AssuranceD)Provisioning答案:D解析:[单选题]11.WhichdesignprincipleshouldbefollowedinaCiscoSD-AccesswirelessnetworkDeployment?A)TheWLCispartofthefabricoverlayB)TheWLCispartofthefabricunderlayC)TheWLCisconnectedoutsideofthefabricD)Theaccesspointisconnectedoutsideofthefabric答案:C解析:[单选题]12.CompanyAhavetworemotesites,whichareconnectedtoacommonISPbyBGP.Ateachsite,companyAisusingthesameautonomoussystemnumber.WhichBGPfeaturecanyouimplementtoenableroutingbetweenthetwosites?A)COMMUNITIESB)PEERGROUPSC)ALLOWAS-IND)ASPATHPREPENDING答案:C解析:[单选题]13.WhichoftheportisnotpartofSTPprotocol.A)ListeningB)LearningC)ForwardingD)Discarding答案:D解析:哪个端口不是STP协议的一部分。D丢弃[单选题]14.WhendoesaCiscoStackWiseprimaryswitchloseitsrole?A)whenthepriorityvalueofastackmemberischangedtoahighervalueB)whenastackmemberfailsC)whenaswitchwithahigherpriorityisaddedtothestackD)whenthestackprimatyisreset答案:D解析:[单选题]15.Whichdesignprinciplestatesthatauserhasnoaccessbydefaulttoanyresource,andunlessAresourceisexplicitlygranted,itshouldbedenied?A)completemediationB)leastprivilegeC)economyofmechanismD)fail-safedefaults答案:D解析:[单选题]16.Refertotheexhibit.AnengineerisusingXMLinanapplicationtosendinformationtoaRESTCONF-enabledevice.Aftersendingtherequest,theengineergetsthisResponsemessageandaHTTPresponsecodeof400.whatdotheseresponsestelltheengineer?A)TheAcceptheadersentwasapplication/xmlB)POSTwasusedinsteadofPUTtoupdateC)TheContent-Typeheadersentwasapplication/xmlD)AJSONbodywasused答案:A解析:[单选题]17.WhichentityisaType1hypervisor?A)OracleVMVirtualBoxB)VMwareserverC)CitrixXenServerD)MicrosoftVirtualPC答案:C解析:[单选题]18.WhichLISPinfrastructuredeviceprovidesconnectivitybetweennon-LISPsitesandLISPsitesbyreceivingnon-LISPtrafficwithaLISPsitedestination?A)PITRB)mapresolverC)mapserverD)PETR答案:A解析:[单选题]19.Whenafloatingstaticrouteisconfigured,whichactionensuresthatthebackuprouteisusedwhentheprimaryroutefails?A)ThefloatingstaticroutemusthaveahigheradministrativedistancethantheprimaryroutesoitisusedasabackupB)Theadministrativedistancemustbehigherontheprimaryroutesothatthebackuproutebecomessecondary.C)ThefloatingstaticroutemusthavealoweradministrativedistancethantheprimaryroutesoitisusedasabackupD)Thedefault-informationoriginatecommandmustbeconfiguredfortheroutetobeinstalledintotheroutingtable答案:A解析:[单选题]20.WhichactionisafunctionofVTEPinVXLAN?A)tunnelingtrafficfromIPv6toIPv4VXLANsB)allowingencryptedcommunicationonthelocalVXLANEthernetsegmentC)encapsulatingandde-encapsulatingVXLANEthernetframesD)tunnelingtrafficfromIPv4toIPv6VXLANs答案:C解析:[单选题]21.WhatactionestablishestheOSPFneighborrelationshipwithoutforminganadjacency?class="fr-ficfr-dibcursor-hover"A)modifyhellointervalB)modifyprocessIDC)modifypriorityD)modifynetworktype答案:A解析:[单选题]22.HowdoTCPandUDPdifferinthewaytheyguaranteepacketdelivery?A)TCPuseschecksum,acknowledgement,andretransmissions,andUDPuseschecksumsonly.B)TCPusestwo-dimensionalparitychecks,checksums,andcyclicredundancychecksandUDPusesretransmissionsonly.C)TCPuseschecksum,paritychecks,andretransmissions,andUDPusesacknowledgementsonly.D)TCPusesretransmissions,acknowledgementandparitychecksandUDPusescyclicredundancychecksonly.答案:A解析:[单选题]23.WhichelementenablescommunicationbetweenguestVMswithinavirtualizedenvironment?A)pNICB)vSwitchC)virtualrouterD)hypervisor答案:B解析:[单选题]24.Whywouldalogfilecontaina*nexttothedate?A)ThenetworkdeviceisnotconfiguredtouseNTPtimestampsforlogging.B)ThenetworkdevicewasunabletoreachtheNTPserverwhenthelogmessageswererecorded.C)ThenetworkdeviceisnotconfiguredtouseNTPD)ThenetworkdevicewasreceivingNTPtimewhenthelogmessageswererecorded答案:C解析:[单选题]25.OnanetworkusingDiffServ,whichoptionreferstotheactionsthatappliedtoapacketasitmovesthroughthenetwork?A)SUPPORTFORSOURCESPECIFICMULTICASTB)AMECHANISMTODECREASELEAVELATENCYC)AUTHENTICATIONOFMULTICASTSTREAMSD)BACKWARDCOMPATIBILITYWITHIGMPVERSION1答案:A解析:[单选题]26.Whenisanexternalantennausedinsideabuilding?A)onlywhenusing5GHzB)onlywhenusing2.4GHzC)whenitprovidestherequiredcoverageD)onlywhenusingMobilityExpress答案:C解析:当它提供所需的覆盖率时[单选题]27.WhichaccesspointmodeallowsasupportedAPtofunctionlikeaWLANclientwould,associatingandidentifyingclientconnectivityissues?A)clientmodeB)SE-connectmodeC)sensormodeD)sniffermode答案:C解析:[单选题]28.WhichCiscoDNAcenterapplicationisresponsibleforgroup-basedaccesscontrolPermissions?A)DesignB)ProvisionC)AssuranceD)Policy答案:D解析:[单选题]29.WhichwaytoinfluencepathselectionwithEIGRPispreferred?A)CHANGINGTHEBANDWIDTH,BECAUSETHATISWHATCISCORECOMMENDSB)CHANGINGTHEBANDWIDTH,BECAUSETHATISWHATCISCORECOMMENDSC)CHANGINGTHEBANDWIDTH,BECAUSEITMUSTBEDONEONLYONONEINTERFACEALONGTHEPATHD)CHANGINGTHEDELAY,EVENIFITMUSTBEDONEONMULTIPLEINTERFACES答案:D解析:[单选题]30.HowaretheCiscoExpressForwardingtableandtheFIBrelatedtoeachother?A)TheFIBisusedtopopulatetheCiscoExpressForwardingtableB)TheCiscoExpressForwardingtableallowsroutelookupstobeforwardedtotherouteprocessorforprocessingbeforetheyaresenttotheFIBC)TherecanbeonlyoneFIBbutmultipleCiscoExpressForwardingtablesonIOSdevicesD)CiscoExpressForwardingusesaFIBtomakeIPdestinationprefix-basedswitchingdecisions答案:D解析:[单选题]31.InwhichpartoftheHTTPmessageisthecontenttypespecified?A)HTTPmethodB)bodyC)headerD)URI答案:C解析:[单选题]32.AlocalroutershowsanEBGPneighborintheActivestate.Whichstatementistrueaboutthelocalrouter?A)ThelocalrouterhasactiveprefixintheforwardingtablefiromtheneighboringrouterB)ThelocalrouterhasBGPpassivemodeconfiguredfortheneighboringrouterC)ThelocalrouterisattemptingtoopenaTCPsessionwiththeneighboringrouter.D)ThelocalrouterisreceivingprefixesfromtheneighboringrouterandaddingtheminRIB-IN答案:C解析:[单选题]33.AcorporateofficeusesfourfloorsinabuildingFloor1has24usersFloor2has29usersFloor3has28usersFloor4has22usersWhichsubnetsummarizesandgivesthemostefficientdistributionofIPaddressesfortherouterconfiguration?A)/26assummaryand/29foreachfloorB)/24assummaryand/28foreachfloorC)/23assummaryand/25foreachfloorD)/25assummaryand/27foreachfloor答案:D解析:划分子网数②子网位数③子网掩码（二进制）④子网掩码（十进制）⑤每个子网主机数①1～2②1③11111111.11111111.11111111.10000000（/25）④28⑤126①3～4②2③11111111.11111111.11111111.11000000（/26）④92⑤62①5～8②3③11111111.11111111.11111111.11100000（/27）④24⑤3032-27=52的5次方-2=30个主机数①9～16②4③11111111.11111111.11111111.11110000（/28）④40⑤14[单选题]34.WhichfunctiondoesafabricAPperforminaCiscoSD-Accessdeployment?A)Itmanageswirelessclients?membershipinformationinthefabricB)Itconnectswirelessclientstothefabric.C)Itupdateswirelessclients?locationsinthefabricD)Itconfiguressecuritypoliciesdowntowirelessclientsinthefabric答案:B解析:[单选题]35.Amanagerasksanetworkengineertoadvisewhichcloudservicemodelsareusedsoemployeesdonothavetowastetheirtimeinstalling,managing,andupdatingsoftwarewhichisonlyusedoccasionally.Whichcloudservicemodeldoestheengineerrecommend?A)infrastructure-as-a-serviceB)platform-as-a-serviceC)businessprocessasservicetosupportdifferenttypesofserviceD)software-as-a-service答案:D解析:[单选题]36.YouareconfiguringanIPSLAICMPEchooperationtotroubleshootanetworkconnectivityissue.WhendoyouenteranIPaddresstotesttheIPSLA?A)whenyouenabletheICMPEchooperationB)whenyoudefinetheICMPEchooperationC)whenyouspecifythetestfrequencyD)whenyouverifytheIPSLAoperation答案:B解析:您正在配置IPSLAICMP回显操作以解决网络连接问题。何时输入IP地址以测试IPSLA？b.定义ICMP回显操作时[单选题]37.howarctheciscoexpressforwardingtableandtheFIBrelatedtoeachother?A)THEFIBISUSEDTOPOPULATETHECISCOEXPRESSFORWARDINGTABLE.B)THECISCOEXPRESSFORWARDINGTABLEALLOWSROUTELOOKUPSTOBEFORWARDEDTOTHEROUTEPROCESSORFORPROCESSINGBEFORETHEYAREC)THERECANBEONLYONEFIBBUTMULTIPLECISCOEXPRESSFORWARDINGTABLESONIOSDEVICES.D)CISCOEXPRESSFORWARDINGUSESAFIBTOMAKEIPDESTINATIONPREFIX-BASEDSWITCHINGDECISIONS.答案:D解析:[单选题]38.Whichunitmeasuresthepowerofaradiosignalwithreferenceto1milliwatt?A)dBwB)dBiC)mWD)dBm答案:D解析:[单选题]39.dwhichtypeofportwouldhaverootguardenabledonit?A)AROOTPORTB)AILALTERNATEPORTC)ABLOCKEDPORTD)ADESIGNATEDPORT答案:D解析:[单选题]40.CiscolOSsupportswhichQoSmodels?A)besteffortandintegratedservicesB)integratedservicesanddifferentiatedservicesC)best-effortanddifferentiatedservicesD)best-effort,integratedservices,anddifrentiatedservices答案:D解析:思科lOS支持哪些QoS模型?尽力、D.综合服务和综合服务[单选题]41.WhichkeychaincryptographicalgorithmissupportedbytheIS-ISroutingprotocol?A)HMAC-SHA1-12B)HMAC-MD5C)MD5D)HMAC-SHA1-20答案:B解析:[单选题]42.WhichcharacteristicdistinguishesAnsiblefromChef?A)Ansiblelacksredundancysupportforthemasterserver.Chefrunstwomastersinanactive/activemodeB)AnsibleusesRubytomanageconfigurations.ChefusesYAMLtomanageconfigurationsC)Ansiblepushestheconfigurationtotheclient.ChefclientpullstheconfigurationfromtheserverD)TheAnsibleservercanrunonLinux,UnixorWindows.TheChefservermustrunonLinuxorUnix答案:C解析:[单选题]43.WhichWPA3enhancementprotectsagainsthackersviewingtrafficontheWi-Finetwork?A)TKiPencryptionB)AESencryptionC)scrambledencryptionkeyD)SAEencryption答案:D解析:[单选题]44.HowisMSDPusedtointerconnectmultiplePIM-SMdomains?A)MSDPdependsonBGPormultiprotocolBGPforinterdomainoperationB)MSDPmessagesareusedtoadvertiseactivesourcesinadomainC)MSDPSArequestmessagesareusedtorequestalistofactivesourcesforaspecificgroupD)MSDPallowsarendezvouspointtodynamicallydiscoveractivesourcesoutsideofitsdomain答案:B解析:[单选题]45.WithIGMPv2,whichmulticastgroupaddressdoestheIGMPquerierusetosendquerymessagestoallhostsontheLAN?A)B)C)D)答案:B解析:[单选题]46.AhostonanEthernetsegmenthasadifferentsubnetmaskthanthedefaultgateway.Whatcanbedonetoallowittocommunicatewithdevicesoutsideofthissubnet?A)CONFIGUREASTATICROUTEFORTHEHOSTONTHEDEFAULTGATEWAY.B)CONFIGUREASTATICARPENTRYONTHEDEFAULTGATEWAYFORTHEHOSTIPADDRESS.C)ENABLEGRATUITOUSARPONTHEHOST.D)ENABLEPROXYARPONTHEDEFAULTGATEWAY.答案:A解析:[单选题]47.whichWPA3enhancementprotectsagainsthackersviewingtrafficontheWi-Finetwork?A)TKIPencryptionB)SAEencryptionC)AESencryptionD)scrambledencryptionkey答案:B解析:[单选题]48.WheredoesaswitchmaintainDHCPsnoopinginformation?A)intheMACaddresstableB)intheCAMtableC)intheDHCPbindingdatabaseD)intheVLANdatabase答案:C解析:交换机在哪里维护DHCP监视信息?C在DHCP绑定数据库中[单选题]49.Howis802.11traffichandledinafabric-enabledSSID?A)CentrallyswitchedbacktoWLCwheretheusertrafficismappedtoaVLANontheWLCB)ConvertedtheAPinto802.3andencapsulatedintoVXLANC)ConvertedtheAPinto802.3andencapsulatedintoaVLAND)CentrallyswitchedbacktoWLCwheretheusertrafficismappedtoVXLANontheWLC答案:B解析:[单选题]50.Whichsecurityprogramelementinvolvesinstallingbadgereadersondata-centerdoorstoallowworkerstoenterandexitbasedontheirjobroles?A)role-basedaccesscontrolB)biometricsC)multifactorauthenticationD)physicalaccesscontrol答案:D解析:[单选题]51.ExternalEIGRProuteexchangeonroutersR1andR2wasfailingbecausetheroutershadduplicaterouterIDs.Youchangedtheeigrprouter-idcommandonR1,buttheproblempersists.Whichadditionalactionmustyoutaketoenabletherouterstoexchangeroutes?A)CHANGETHECORRESPONDINGLOOPBACKADDRESS.B)CHANGETHEROUTEREDONR2.C)RESETTHEEIGRPNEIGHBORRELATIONSHIP.D)CLEARTHEEIGRPPROCESS.答案:D解析:[单选题]52.WhichCRUDoperationmodifiesanexistingtableorview?A)readB)createC)replaceD)update答案:D解析:[单选题]53.WhatisusedtomeasurethetotaloutputenergyofaWi-Fidevice?A)dBiB)EIRPC)mWD)dBm答案:C解析:[单选题]54.Wirelessusersreportfrequentdisconnectionsfromthewirelessnetwork.Whiletroubleshootinganetworkengineerfindsthataftertheuseradisconnect,theconnectionreestablishesautomaticallywithoutanyinputrequired.Theengineeralsonoticesthesemessagelogs.Whichactionreducestheuserimpact?A)increasethedynamicchannelassignmentintervalB)increaseBandSelectC)increasetheAPheartbeattimeoutD)enablecoverageholedetection答案:A解析:[单选题]55.Anorganizationhasdecidedtostartusingcloud-providedservices.Whichcloudserviceallowstheorganizationtoinstallitsownoperatingsystemonavirtualmachine?A)platform-as-a-serviceB)software-as-a-serviceC)network-as-a-serviceD)infrastructure-as-a-service答案:B解析:[单选题]56.Howdostratumlevelsrelatetothedistancefromatimesource?A)Stratum1devicesareconriecteddirectlytoanauthoritativetimesourceB)Stratum15devicesareconnecteddirectlyto已nauthoritativetimesourceC)Stratum15devicesareanauthoritativetimesourceD)Stratum0devicesareconnecteddirectlytoanauthoritativetimesource答案:A解析:[单选题]57.Whatroledoesahypervisorprovideforeachvirtualmachineinservervirtualization?A)infrastructure-as-a-service.B)Software-as-a-serviceC)controlanddistributionofphysicalresourcesD)servicesasahardwarecontroller.答案:C解析:[单选题]58.whichopenstackcomponentimplementsrole-basedaccesscontrol?A)HORIZONB)NOVAC)NEUTROND)KEYSTONE答案:D解析:[单选题]59.WhichIPSLAoperationrequirestheIPSLArespondertobeconfiguredontheremoteend?A)UDPjitterB)ICMPjitterC)TCPconnectD)ICMPecho答案:A解析:[单选题]60.Whichmarkingfieldisusedonlyasaninternalmarkingwithinarouter?A)QOSGroupB)DiscardEligiblityC)IPPrecedenceD)MPLSExperimental答案:A解析:[单选题]61.inWhichwaydoesaspineand-leafarchitectureallowforscalabilityinanetworkwhenadditionalaccessportsarerequired?A)AspineswitchandaleafswitchcanbeaddedwithredundantconnectionsbetweenthemB)Aspineswitchcanbeaddedwithatleast40GBuplinksC)Aleafswitchcanbeaddedwithasingleconnectiontoacorespineswitch.D)Aleafswitchcanbeaddedwithconnectionstoeveryspineswitch答案:D解析:叶不连接到叶，每一片叶都连接到骨干，部署在top；骨干不连接到骨干，连接到所有叶，部署在中部或尾端。[单选题]62.AclientdevicefailstoseetheenterpriseSSID,butotherclientdevicesareconnectedtoit.Whatisthecauseofthisissue?A)TheclienthasincorrectcredentialsstoredfortheconfiguredbroadcastSSID.B)ThehiddenSSIDwasnotmanuallyconfiguredontheclient.C)ThebroadcastSSIDwasnotmanuallyconfiguredontheclient.D)TheclienthasincorrectcredentialsstoredfortheconfiguredhiddenSSID.答案:B解析:[单选题]63.Whenasite-to-siteVPNisused,whichprotocolisresponsibleforthetransportofuserdata?A)IKEv2B)IKEv1C)IPsecD)MD5答案:C解析:[单选题]64.HowisMSDPusedtointerconnectmultiplePIM-SMdomains?A)MSDPdependsonBGPormultiprotocolBGPforinterdomainoperationB)MSDPallowsarendezvouspointtodynamicallydiscoveractivesourcesoutsideofitsDomainC)MSDPSArequestmessagesareusedtorequestalistofactivesourcesforaspecificgroupD)MSDPmessagesareusedtoadvertiseactivesourcesinadomain答案:C解析:[单选题]65.whichroutingprotocolisusedonPErouterstoexchangevpnv4routes?A)EIGRPB)MP-BGPC)OSPFD)OSPFV3答案:B解析:[单选题]66.WhyisanAPjoiningadifferentWLCthantheonespecifiedthroughoption43?A)TheWLCisrunningadifferentsoftwareversionB)TheAPIisjoiningaprimedWLCC)TheAPmulticasttrafficunabletoreachtheWLCthroughLayer3D)TheAPsbroadcasttrafficisunabletoreachtheWLCthroughLayer2答案:B解析:[单选题]67.assumingthedefaultswitchconfigurationwhichvlanrangecanbeaddedmodifiedandremovedonaciscoswitch?A)2through1001B)1through1001C)1through1002D)2through1005答案:A解析:假设在a上可以添加、修改和删除vlan范围的默认开关配置思科交换机吗?A2到1001[单选题]68.whichIPv6addressblockforwardspacketstoamulticastaddressratherthanaunicastaddress?A)2000::/3B)FC00::/7C)FE80::/10D)FF00::/12答案:D解析:多播地址FF00::/8[单选题]69.WhichPAgPmodecombinationpreventsanEtherchannelfromforming?A)auto/autoB)desirable/desirableC)auto/desirableD)desirable答案:A解析:[单选题]70.sw2(config)#track1000interfacegigabitEthernet0/0line-protocolSw2(config-track)#exitSw2(config)#interfacevlan1000SW2(confia-if)#ipaddressRefertotheexhibitAnengineermustconfgureHSRPforVLAN1000onSW2.TheSecondaryswitchmustimmediatelytakeovertheroleofactiverouteriftheinterlinkwithTheprimaryswitchfails.Whichcommandsetcompletesthistask?A)sw2(config-if)#standbyversion2Sw2(config-if)#standby1000ipSw2(config-if)#standby1000priority95Sw2(config-if)#standby1000track1000B)sw2(config-if)#standby1000ipSw2(config-if)#standby1000priority95Sw2(config-if)#standby1000preemptSw2(config-if)#standby1000track1000C)sw2(config-if)#standbyversion2Sw2(config-if)#standby1000ipSw2(config-if)#standby1000priority95Sw2(config-if)#standby1000preemptSw2(config-if)#standby1000track1000D)sw2(config-if)#standbyversion2Sw2(config-if)#standby1000ipSw2(config-if)#standby1000priority95Sw2(config-if)#standby1000preemptSw2(config-if)#standby1000trackgigabitEthernet0/0答案:C解析:[单选题]71.inwhichwaydoesthebridgeassurancemechanismmodifythedefaultspanning-treebehaviorinanefforttopreventbridgingloops?A)RECEIVEDBPDUSARELOOPEDBACKTOWARDTHESENDERTOENSURETHATTHELINKISBIDIRECTIONAL.B)IFBPDUSARCNOLONGERRECEIVEDONAPORT,THESWITCHIMMEDIATELYSCUDSOUTATCNBPDU.C)EXTENDEDTOPOLOGYINFORMATIONISENCODEDINTOALLBPDUS.D)BPDUSARESENTBIDIRECTIONALONALLACTIVENETWORKPORTS,INCLUDINGBLOCKEDANDALTERNATEPORTS.答案:D解析:[单选题]72.WhywouldanengineeruseYANG?A)tomodeldataforNETCONFB)toaccessdatausingSNMPC)totransportdatabetweenacontrollerandanetworkdeviceD)totranslateJSONintoanequivalentXMLsyntax答案:A解析:[单选题]73.forwhatreasonmightyouchoosetouseanSVTIinterfaceinsteadofacryptomaponatunnelinterface?A)SVTISSUPPORTDYNAMICROUTINGPROTOCOLSWITHOUTGREHEADERS.B)SVTISCANSUPPORTMULTIPLEIPSECSAS.C)SVTISCANCARRYNON-IPTRAFFIC.D)SVTISSUPPORTCEF-SWITCHEDTRAFFICSHAPING.答案:A解析:[单选题]74.Apacketisdestinedfor2.Whichstaticroutedoestherouterchoosetoforwardthepacket?A)iproute40B)iproute652C)iproute052D)iproute054答案:C解析:[单选题]75.WhiletroubleshootingaGREtunnelinterfaceissue,showinterfacecommandoutputdisplaystunnelstatusup,butlineprotocolisdown.Whichreasonforthisproblemismostlikely?A)TheroutetothetunneldestinationaddressisthroughthetunnelitselfB)ThenexthopserverismisconfiguredC)TheinterfacehasbeenadministrativelyshutdownD)Thetunnelwasjustreset答案:A解析:在排除GRE隧道接口问题时，showinterface命令输出将显示隧道状态上升，但线路协议下降。造成这个问题的原因是什么?A到隧道目的地地址的路线是通过隧道本身[单选题]76.Inafabric-enabledwirelessnetwork,whichdeviceisresponsibleformaintainingtheendpointIDdatabase?A)FabricbordernodeB)FabricedgenodeC)FabricwirelesscontrollerD)Controlplanenode答案:D解析:[单选题]77.externalEIGRProuteexchangeonroutersR1andR2wasfailingbecausetheroutershadduplicaterouterids.Youchangedtheeigrprouter-idcommandonR1,buttheproblempersists.whichadditionalactionmustyoutaketoenabletherouterstoexchangeroutes?A)CHANGETHECORRESPONDINGLOOPBACKADDRESS.B)CHANGETHEROUTEREDONR2.C)RESETTHEEIGRPNEIGHBORRELATIONSHIP.D)CLEARTHEEIGRPPROCESS.答案:D解析:[单选题]78.Howisadatamodelinglanguageused?A)Toenabledatatobeeasilystructured,groupedvalidated,andreplicatedB)Torepresentfiniteandwell-definednetworkelementsthatcannotbechangedC)TomodeltheflowsofunstructureddatawithintheinfrastructureD)Toprovidehumanreadabilitytoscriptinglanguages答案:A解析:[单选题]79.Thedefault-informationoriginatecommandisconfiguredundertheR1OSPFconfigurationAftertestingworkstationsonVLAN20atSiteBcannotreachaDNSserverontheInternet.Whichactioncorrectstheconfigurationissue?class="fr-ficfr-dibcursor-hover"A)Addthedefault-informationoriginatecommandonR2B)Configuretheiproute8commandonR1C)ConfiguretheiproutecommandonR2D)Addthealwayskeywordtothedefault-informationoriginatecommandonR1答案:B解析:[单选题]80.Question4Refertotheexhibit.Device#configureterminalDevice(config)#netconfsshacl1Device(config)#netconflock-time100Device(config)#netconfmax-sessions1Device(config)#netconfmax-message10AnetworkengineermustconfigureNETCONF.Aftercreatingtheconfiguration,theEngineergetsoutputfromthecommandshowline,butnotfromshowrunning-config.WhichCommandcompletestheconfiguration?A)Device(config)#nonetconfsshacl1B)Device(config)#netconfmax-sessions100C)Device(config)#netconflock-time500D)Device(config)#netconfmax-message1000答案:A解析:[单选题]81.routingprocessistrue?A)ITPREVENTSEIGRPNEIGHBORRELATIONSHIPSFROMBEINGFORMEDOVERINTERFACES0/0.B)ITCONFIGURESINTERFACES0/0TOSENDHELLOPACKETSWITHTHEPASSIVE-INTERFACEBITSET.C)ITCONFIGURESINTERFACES0/0TOSUPPRESSALLOUTGOINGROUTINGUPDATESD)ITCONFIGURESINTERFACES0/0TOREJECTALLINCOMINGROUTINGUPDATES答案:A解析:[单选题]82.PC1istryingtopingPC3forthefirsttimeandsendsoutanARPtoS1.WhichactionistakenbyS1?class="fr-ficfr-dibcursor-hover"A)ItforwardsitoutG0/3onlB)ItisfloodedouteveryportexceptG0/0C)ItdropstheframeD)ItforwardsitoutinterfaceG0/2only答案:B解析:[单选题]83.whateventhasoccurredifaroutersendsanoticelevelmessagetoasyslogserver?A)AninterfacelinehaschangedstatusB)AnICMPconnectionhasbeenbuiltC)AcertificatehasexpiredD)ATCPconnectionhasbeentorndown答案:A解析:[单选题]84.ForwhatreasonmightyouchoosetouseanSVTIinterfaceinsteadofacryptomaponatunnelinterface?A)SVTISSUPPORTDYNAMICROUTINGPROTOCOLSWITHOUTGREHEADERS.B)SVTISCANSUPPORTMULTIPLEIPSECSAS.C)SVTISCANCARRYNON-IPTRAFFIC.D)SVTISSUPPORTCEF-SWITCHEDTRAFFICSHAPING.答案:A解析:[单选题]85.WhichfunctiondoesafabricwirelessLANcontrollerperforminaCiscoSD-Accessdeployment?A)isdedicatedtoonboardclientsinfabncenabledandnonfabnc-enabledAPswithinthefabricB)coordinatesconfigurationofsutonomousnonfabricaccesspointswithinthefabricC)performstheassuranceengineroleforbothwiredandwirelessdientsD)managesfabric-enabledAPssndforwardsclientregistrationandroaminginforrmationtotheControlPlaneNode答案:D解析:[单选题]86.WhichQoScomponentaltersapackettochangethewaythattrafficistreatedinthenetwork?A)policingB)classificationC)markingD)shaping答案:C解析:[单选题]87.whichcommandcanyouentertoconfigureabuilt-inpolicerwithminimumguaranteedbandwidthwithoutstarvingotherclassesduringperiodsofcongestion?A)BANDWIDTHREMAININGPERCENTB)BANDWIDTHC)PRIORITYPERCENTD)FAIR-QUEUE答案:C解析:[单选题]88.whenisitmostimportanttoimplementmultiplesynonymousareaaddressesouanIS-ISnetwork?A)WHENINTEGRATINGANIS-ISLAYER2ROUTERWITHANOTHERROUTINGPROTOCOLB)WHENANIS-ISROUTERISMERGINGROUTINGINFORMATIONC)WHENSPLITTINGAREASINTHEIS-ISDOMAIND)WHENMERGINGORSPLITTINGAREASINTHEIS-ISDOMAIN答案:D解析:[单选题]89.WheredoesroutingoccurwithintheDoDTCP/IPreferencemodel?A)applicationB)InternetC)networkD)transport答案:B解析:在国防部TCP/IP参考模型中路由发生在哪里?B网络层[单选题]90.OnwhichprotocolortechnologyisthefabricdataplanebasedinCiscoSD-Accessfabric?A)LISPB)IS-ISC)CiscoTrustSecD)VXLAN答案:D解析:[单选题]91.UnderwhichnetworkconditionsisanoutboundQoSpolicythatisappliedonarouterWANinterfacemostbeneficial?A)underallnetworkconditionsB)undernetworkconvergenceconditionsC)underinterfacesaturationconditionsD)undertrafficclassificationandmarkingconditions答案:C解析:[单选题]92.Whatdoesreversepathforwardingensureinamulticastnetwork?A)ITENSURESTHATANYMULTICASTHOSTCANRECEIVETHEMULTICASTSTREAM.B)ITENSURESTHATTHESOURCEOFTHEMULTICASTCANFORWARDTHEMULTICASTSTREAM.C)ITENSURESALOOP-FREEMULTICASTNETWORK.D)ITENSURESTHATMULTICASTHOSTSCANJOINTHEINTENDEDMULTICASTGROUPS.答案:C解析:[单选题]93.whatdoesreversepathforwardingensureinamulticastnetwork?A)ITENSURESTHATANYMULTICASTHOSTCANRECEIVETHEMULTICASTSTREAM.B)ITENSURESTHATTHESOURCEOFTHEMULTICASTCANFORWARDTHEMULTICASTSTREAM.C)ITENSURESALOOP-FREEMULTICASTNETWORK.D)ITENSURESTHATMULTICASTHOSTSCANJOINTHEINTENDED