2025年思科認(rèn)證網(wǎng)絡(luò)工程師(CCNP)考試題庫(kù)（附答案和詳細(xì)解析）（0811）1.WhichcommandisusedtoconfigureaDHCPpoolonaCiscorouter?A.ipdhcppool<poolname>B.dhcppool<poolname>C.setdhcppool<poolname>D.createdhcppool<poolname>Answer:AAnalysis:ThecorrectcommandtoconfigureaDHCPpoolonaCiscorouteris“ipdhcppool<poolname>”.OptionsB,C,andDareincorrectasthesearenotthevalidcommandsforthispurpose.2.Whatisthepurposeofthe“showinterfaces”commandonaCiscorouter?A.TodisplaythestatusofallinterfacesB.ToconfigureinterfacesettingsC.TodeleteinterfaceconfigurationsD.ToshowonlytheIPaddressesofinterfacesAnswer:AAnalysis:The“showinterfaces”commandisusedtodisplaythestatus,statistics,andconfigurationinformationofallinterfacesonaCiscorouter.Itdoesnotconfigure,deletesettingsoronlyshowIPaddresses.3.InOSPF,whatisthedefaultHellointervalforabroadcastnetwork?A.10secondsB.30secondsC.40secondsD.60secondsAnswer:AAnalysis:ForabroadcastnetworkinOSPF,thedefaultHellointervalis10seconds.30secondsisthedefaultHellointervalfornonbroadcastmultiaccess(NBMA)networks.40secondsisthedefaultDeadintervalforbroadcastandpointtopointnetworks,and60secondsisnotarelevantdefaultvalueinthiscontext.4.WhichprotocolisusedforsecureremoteaccesstoaCiscodevice?A.TelnetB.FTPC.SSHD.HTTPAnswer:CAnalysis:SSH(SecureShell)isusedforsecureremoteaccesstoaCiscodevice.Telnetsendsdataincleartextandisnotsecure.FTPisforfiletransfer,andHTTPismainlyforwebbasedaccessandisnotatypicalprotocolfordevicemanagement.5.Whatisthefunctionofanaccesscontrollist(ACL)inaCisconetwork?A.TomanageVLANsB.TofilternetworktrafficC.ToconfigureroutingprotocolsD.TosetupDHCPservicesAnswer:BAnalysis:AnACLinaCisconetworkisusedtofilternetworktrafficbasedoncriteriasuchassourceanddestinationIPaddresses,ports,etc.ItdoesnotmanageVLANs,configureroutingprotocols,orsetupDHCPservices.6.WhichcommandisusedtosavetherunningconfigurationtothestartupconfigurationonaCiscorouter?A.copyrunningconfigstartupconfigB.saverunningconfigstartupconfigC.writerunningconfigstartupconfigD.storerunningconfigstartupconfigAnswer:AAnalysis:Thecorrectcommandtosavetherunningconfigurationtothestartupconfigurationis“copyrunningconfigstartupconfig”.Theotheroptionsarenotthestandardcommandsforthisoperation.7.InEIGRP,whatisthemetricusedtocalculatethebestpath?A.HopcountB.BandwidthanddelayC.OnlybandwidthD.OnlydelayAnswer:BAnalysis:EIGRPusesacompositemetricthatincludesbandwidthanddelaytocalculatethebestpath.HopcountisusedbyRIP,andusingonlybandwidthoronlydelayisnothowEIGRPcalculatesthemetric.8.Whatisthepurposeofthe“noshutdown”commandonaninterface?A.TodisabletheinterfaceB.ToenabletheinterfaceC.ToresettheinterfaceD.TochangetheinterfaceIPaddressAnswer:BAnalysis:The“noshutdown”commandisusedtoenableaninterfacethathasbeenpreviouslyshutdown.“shutdown”isusedtodisableaninterface.ItdoesnotresettheinterfaceorchangetheIPaddress.9.WhichVTPmodeallowsaswitchtocreate,modify,anddeleteVLANs?A.ServermodeB.ClientmodeC.TransparentmodeD.OffmodeAnswer:AAnalysis:InVTP(VLANTrunkingProtocol)servermode,aswitchcancreate,modify,anddeleteVLANs.Inclientmode,theswitchcanonlyreceiveVTPupdates.Intransparentmode,theswitchdoesnotparticipateinVTPupdatesforVLANmanagement,and“off”isnotastandardVTPmode.10.WhatisthedefaultadministrativedistanceofOSPF?A.90B.100C.110D.120Answer:CAnalysis:ThedefaultadministrativedistanceofOSPFis110.Anadministrativedistanceof90isforEIGRPinternalroutes,100isforIGRP,and120isforRIP.11.WhichcommandisusedtodisplaytheroutingtableonaCiscorouter?A.showroutetableB.showiprouteC.displayroutingtableD.listiprouteAnswer:BAnalysis:Thecommand“showiproute”isusedtodisplaytheIProutingtableonaCiscorouter.Theotheroptionsarenotthecorrectcommandsforthisfunction.12.WhatisthepurposeofatrunkportinaVLANenablednetwork?A.ToconnectasingledevicetoaswitchB.TocarrytrafficformultipleVLANsC.TomanageVLANmembershipD.ToprovidepowertoconnecteddevicesAnswer:BAnalysis:AtrunkportinaVLANenablednetworkisusedtocarrytrafficformultipleVLANsbetweenswitches.Aaccessportisusedtoconnectasingledevicetoaswitch.VLANmembershipismanagedthroughothermeans,andatrunkportdoesnotprovidepower.13.InBGP,whatisthetermfortheprocessofexchangingroutinginformationbetweenautonomoussystems?A.IntraASroutingB.InterASroutingC.InteriorroutingD.LocalroutingAnswer:BAnalysis:BGPisaninterAS(AutonomousSystem)routingprotocol,whichmeansitisusedforexchangingroutinginformationbetweendifferentautonomoussystems.IntraASroutingisforroutingwithinanautonomoussystem.Interiorroutingisageneraltermforroutingwithinanetwork,andlocalroutingusuallyreferstoroutingwithinasmall,localnetworksegment.14.WhichcommandisusedtoconfigureanIPaddressonaninterfaceofaCiscorouter?A.ipaddress<ipaddress><subnetmask>B.setip<ipaddress><subnetmask>C.configureip<ipaddress><subnetmask>D.assignip<ipaddress><subnetmask>Answer:AAnalysis:ThecorrectcommandtoconfigureanIPaddressonaninterfaceofaCiscorouteris“ipaddress<ipaddress><subnetmask>”.Theotheroptionsarenotthestandardcommandsforthisconfiguration.15.Whatisthefunctionofadefaultgatewayinanetwork?A.ToprovideDHCPservicesB.ToconnecttotheInternetC.ToforwardtraffictoothernetworksD.TomanagenetworksecurityAnswer:CAnalysis:Adefaultgatewayisusedtoforwardtrafficfromalocalnetworktoothernetworks.ItisnotusedtoprovideDHCPservices,thoughadevicecanperformbothfunctions.ConnectingtotheInternetisabroaderconceptthatmayinvolvethedefaultgatewaybutisnotitssolefunction.NetworksecurityismanagedthroughothermeanssuchasfirewallsandACLs.16.WhichprotocolisusedfordynamicVLANmembershipinaCisconetwork?A.VTPB.DTPC.CDPD.PVST+Answer:AAnalysis:VTP(VLANTrunkingProtocol)isusedfordynamicVLANmembershipmanagementinaCisconetwork.DTP(DynamicTrunkingProtocol)isusedfornegotiatingtrunklinks.CDP(CiscoDiscoveryProtocol)isusedfordiscoveringneighboringCiscodevices,andPVST+(PerVLANSpanningTreePlus)isforlooppreventioninVLANs.17.InRIP,whatisthemaximumnumberofhops?A.10B.15C.20D.25Answer:BAnalysis:InRIP(RoutingInformationProtocol),themaximumnumberofhopsis15.Ahopcountof16isconsideredunreachable.18.Whatisthepurposeofthe“enable”commandonaCiscodevice?A.ToenterusermodeB.ToenterprivilegedmodeC.ToenableaninterfaceD.TostartaserviceAnswer:BAnalysis:The“enable”commandisusedtoenterprivilegedmodeonaCiscodevice.Usermodeistheinitialmodewhenyoufirstconnecttothedevice.“noshutdown”isusedtoenableaninterface,andstartingaservicehasdifferentspecificcommandsdependingontheservice.19.WhichcommandisusedtodisplaytheARPtableonaCiscorouter?A.showarptableB.showiparpC.displayarpD.listiparpAnswer:BAnalysis:Thecommand“showiparp”isusedtodisplaytheIPAddressResolutionProtocol(ARP)tableonaCiscorouter.Theotheroptionsarenotthecorrectcommandsforthisoperation.20.Whatisthefunctionofafirewallinanetwork?A.ToprovideDHCPservicesB.TofilternetworktrafficbasedonsecurityrulesC.ToconfigureroutingprotocolsD.TomanageVLANsAnswer:BAnalysis:Afirewallinanetworkisusedtofilternetworktrafficbasedonsecurityrules.ItdoesnotprovideDHCPservices,configureroutingprotocols,ormanageVLANs.21.InOSPF,whatisthedifferencebetweenabackboneareaandanonbackbonearea?A.BackboneareahasmoreroutersB.NonbackboneareascannotexchangeroutinginformationC.AllnonbackboneareasmustbeconnectedtothebackboneareaD.BackboneareausesadifferentmetricAnswer:CAnalysis:InOSPF,allnonbackboneareasmustbeconnectedtothebackbonearea(area0).Thenumberofroutersisnotthedefiningcharacteristic.Nonbackboneareascanexchangeroutinginformationthroughthebackbonearea.AllareasinOSPFusethesamemetriccalculationmethod.22.WhichcommandisusedtoconfigureastaticrouteonaCiscorouter?A.iproute<destinationnetwork><subnetmask><nexthopaddress>B.staticroute<destinationnetwork><subnetmask><nexthopaddress>C.setroute<destinationnetwork><subnetmask><nexthopaddress>D.configureroute<destinationnetwork><subnetmask><nexthopaddress>Answer:AAnalysis:ThecorrectcommandtoconfigureastaticrouteonaCiscorouteris“iproute<destinationnetwork><subnetmask><nexthopaddress>”.Theotheroptionsarenotthestandardcommandsforthisconfiguration.23.Whatisthepurposeofthe“showcdpneighbors”commandonaCiscodevice?A.TodisplaythelistofneighboringCiscodevicesB.ToshowtheCDPconfigurationC.ToenableCDPonallinterfacesD.TodisableCDPonaninterfaceAnswer:AAnalysis:The“showcdpneighbors”commandisusedtodisplaythelistofneighboringCiscodevicesandsomebasicinformationaboutthem.ItdoesnotshowtheCDPconfiguration,enableordisableCDPoninterfaces.24.InEIGRP,whatisthedifferencebetweenafeasiblesuccessorandasuccessor?A.Afeasiblesuccessorisabackuproute,whileasuccessoristheprimaryrouteB.AfeasiblesuccessorhasahighermetricthanasuccessorC.AsuccessorisnotusedinpacketforwardingD.AfeasiblesuccessorisalwaysthesameasthesuccessorAnswer:AAnalysis:InEIGRP,asuccessoristheprimaryrouteusedforpacketforwarding,andafeasiblesuccessorisabackuproutethatcanbeusedimmediatelyifthesuccessorfails.Afeasiblesuccessorhasalowermetricthanacertainthresholdrelatedtothesuccessor.Thesuccessorisusedforpacketforwarding,andafeasiblesuccessorisdifferentfromthesuccessor.25.WhichprotocolisusedforautomatictrunknegotiationbetweenCiscoswitches?A.VTPB.DTPC.STPD.CDPAnswer:BAnalysis:DTP(DynamicTrunkingProtocol)isusedforautomatictrunknegotiationbetweenCiscoswitches.VTPisforVLANmanagement,STP(SpanningTreeProtocol)isforloopprevention,andCDPisfordiscoveringneighboringCiscodevices.26.Whatisthepurposeofthe“servicepasswordencryption”commandonaCiscodevice?A.ToencryptallpasswordsintheconfigurationB.ToenableSSHC.ToconfigureapasswordforaninterfaceD.TosetupapasswordfortheenablemodeAnswer:AAnalysis:The“servicepasswordencryption”commandisusedtoencryptallpasswordsintheconfigurationfile.ItdoesnotenableSSH,configureaninterfacepassword,orsetuptheenablemodepassword.27.InBGP,whatisaroutereflector?A.AdevicethatreflectsallincomingtrafficB.AdevicethathelpsinthedistributionofroutinginformationwithinanASC.AdevicethatblocksallBGPtrafficD.AdevicethatonlyacceptsinternalBGProutesAnswer:BAnalysis:InBGP,aroutereflectorisadevicethathelpsinthedistributionofroutinginformationwithinanautonomoussystem(AS).Itdoesnotreflectallincomingtraffic,blockBGPtraffic,oronlyacceptinternalBGProutes.28.WhichcommandisusedtodisplaytheVLANinformationonaCiscoswitch?A.showvlaninfoB.showvlanC.displayvlandetailsD.listvlanAnswer:BAnalysis:Thecommand“showvlan”isusedtodisplaytheVLANinformationonaCiscoswitch.Theotheroptionsarenotthecorrectcommandsforthisoperation.29.WhatisthefunctionofaLayer2switchinanetwork?A.ToperformroutingbetweendifferentnetworksB.TofilternetworktrafficbasedonIPaddressesC.ToforwardframesbasedonMACaddressesD.ToprovideDHCPservicesAnswer:CAnalysis:ALayer2switchforwardsframesbasedonMACaddresses.Routingbetweendifferentnetworksisthefunctionofarouter.FilteringbasedonIPaddressesisusuallydonebyafirewallorarouterwithACLs.ProvidingDHCPservicesisadifferentfunctiontypicallyperformedbyaDHCPserver.30.InOSPF,whatisthepurposeofthe“area<areaid>authenticationmessagedigest”command?A.ToenablesimplepasswordauthenticationforanOSPFareaB.ToenableMD5authenticationforanOSPFareaC.TodisableauthenticationforanOSPFareaD.TosetupapasswordfortheentireOSPFprocessAnswer:BAnalysis:The“area<areaid>authenticationmessagedigest”commandisusedtoenableMD5authenticationforanOSPFarea.Simplepasswordauthenticationhasadifferentcommand.ThiscommanddoesnotdisableauthenticationorsetupapasswordfortheentireOSPFprocess.31.WhichcommandisusedtoconfigureaVLANonaCiscoswitch?A.vlan<vlanid>B.createvlan<vlanid>C.setvlan<vlanid>D.configurevlan<vlanid>Answer:AAnalysis:ThecorrectcommandtoconfigureaVLANonaCiscoswitchis“vlan<vlanid>”.Theotheroptionsarenotthestandardcommandsforthisconfiguration.32.Whatisthepurposeofthe“debug”commandonaCiscodevice?A.TotroubleshootnetworkproblemsbydisplayingdetailedinformationB.TodisableaserviceC.ToconfigureanewinterfaceD.TosavetheconfigurationAnswer:AAnalysis:The“debug”commandonaCiscodeviceisusedtotroubleshootnetworkproblemsbydisplayingdetailedinformationaboutvariousprocessesandprotocols.Itdoesnotdisableaservice,configureanewinterface,orsavetheconfiguration.33.InEIGRP,whatistheDiffusingUpdateAlgorithm(DUAL)usedfor?A.TocalculatetheshortestpathB.TomanageVLANsC.ToprovideDHCPservicesD.ToconfigureroutingprotocolsAnswer:AAnalysis:TheDiffusingUpdateAlgorithm(DUAL)inEIGRPisusedtocalculatetheshortestpathandtomaintainloopfreerouting.ItdoesnotmanageVLANs,provideDHCPservices,orconfigureroutingprotocols.34.WhichprotocolisusedfornetworkdiscoveryandinformationsharingbetweenCiscodevices?A.VTPB.DTPC.STPD.CDPAnswer:DAnalysis:CDP(CiscoDiscoveryProtocol)isusedfornetworkdiscoveryandinformationsharingbetweenCiscodevices.VTPisforVLANmanagement,DTPisfortrunknegotiation,andSTPisforloopprevention.35.Whatisthepurposeofthe“bannermotd”commandonaCiscodevice?A.TodisplayamessageofthedaywhenauserlogsinB.ToconfigureapasswordfortheconsoleportC.ToenableSSHD.TosetupaVLANAnswer:AAnalysis:The“bannermotd”commandisusedtodisplayamessageofthedaywhenauserlogsintoaCiscodevice.Itdoesnotconfigureaconsoleportpassword,enableSSH,orsetupaVLAN.36.InOSPF,whatisthedifferencebetweenaType1andaType2LSA?A.Type1LSAisforexternalroutes,andType2LSAisforinternalroutesB.Type1LSAisgeneratedbyallroutersinanarea,andType2LSAisgeneratedbytheDesignatedRouterC.Type2LSAhasahigherprioritythanType1LSAD.Type1LSAisusedforinterarearoutingAnswer:BAnalysis:InOSPF,Type1LSA(RouterLSA)isgeneratedbyallroutersinanareatodescribetheirownlinks.Type2LSA(NetworkLSA)isgeneratedbytheDesignatedRouter(DR)onamultiaccessnetwork.Type1LSAisforinternalrouteswithinanarea,notexternalroutes.ThereisnosuchconceptofprioritybetweenType1andType2LSAsinthisway,andType1LSAisnotmainlyforinterarearouting.37.WhichcommandisusedtodisplaytheinterfacestatisticsonaCiscorouter?A.showinterfacestatsB.showinterfacesstatisticsC.displayinterfaceinfoD.listinterfacestatsAnswer:BAnalysis:Thecommand“showinterfacesstatistics”isusedtodisplaytheinterfacestatisticsonaCiscorouter.Theotheroptionsarenotthecorrectcommandsforthisoperation.38.WhatisthefunctionofaLayer3switchinanetwork?A.ToonlyforwardframesbasedonMACaddressesB.ToperformroutingbetweenVLANsC.ToprovideDHCPservicesD.TomanageVTPAnswer:BAnalysis:ALayer3switchcanperformroutingbetweenVLANsinadditiontobasicLayer2switchingfunctions.ForwardingframesbasedonMACaddressesismainlyaLayer2function.ProvidingDHCPservicesisdonebyaDHCPserver,andmanagingVTPisrelatedtoVLANmanagementandnotthemainfunctionofaLayer3switch.39.InBGP,whatisthedifferencebetweenIBGPandEBGP?A.IBGPisusedwithinanAS,andEBGPisusedbetweenASesB.IBGPhasahigheradministrativedistancethanEBGPC.EBGPdoesnotuseTCPforcommunicationD.IBGPcannotlearnexternalroutesAnswer:AAnalysis:IBGP(InternalBorderGatewayProtocol)isusedforroutingwithinanautonomoussystem(AS),andEBGP(ExternalBorderGatewayProtocol)isusedforroutingbetweendifferentautonomoussystems.IBGPhasaloweradministrativedistancethanEBGP.BothIBGPandEBGPuseTCPforcommunication.IBGPcanlearnexternalroutesandredistributethemwithintheAS.40.WhichcommandisusedtocleartheARPcacheonaCiscorouter?A.cleararpcacheB.cleariparpC.deletearptableD.removeiparpAnswer:BAnalysis:Thecommand“cleariparp”isusedtocleartheARPcacheonaCiscorouter.Theotheroptionsarenotthecorrectcommandsforthisoperation.41.Whatisthepurposeofthe“spanningtreemodepvst+”commandonaCiscoswitch?A.ToenablePerVLANSpanningTreePlusB.TodisablespanningtreeC.ToconfigureaVLAND.TosetupatrunklinkAnswer:AAnalysis:The“spanningtreemodepvst+”commandisusedtoenablePerVLANSpanningTreePlusonaCiscoswitch.Itdoesnotdisablespanningtree,configureaVLAN,orsetupatrunklink.42.InEIGRP,whatistheeffectofthe“variance”command?A.ItincreasesthemetricofallroutesB.ItallowstheuseofmultiplepathswithdifferentmetricsforloadbalancingC.ItdisablesloadbalancingD.ItchangestheadministrativedistanceofEIGRPAnswer:BAnalysis:The“variance”commandinEIGRPallowstheuseofmultiplepathswithdifferentmetricsforloadbalancing.Itdoesnotincreasethemetricofallroutes,disableloadbalancing,orchangetheadministrativedistanceofEIGRP.43.Whichprotocolisusedforsynchronizingtimebetweennetworkdevices?A.NTPB.SNMPC.FTPD.HTTPAnswer:AAnalysis:NTP(NetworkTimeProtocol)isusedforsynchronizingtimebetweennetworkdevices.SNMPisfornetworkmanagement,FTPisforfiletransfer,andHTTPisforwebbasedaccess.44.Whatisthepurposeofthe“ipdefaultgateway”commandonaCiscoswitch?A.ToconfiguretheswitchtouseaDHCPserverB.TosetthedefaultgatewayfortheswitchtocommunicatewithothernetworksC.ToenableSSHontheswitchD.TocreateaVLANAnswer:BAnalysis:The“ipdefaultgateway”commandonaCiscoswitchisusedtosetthedefaultgatewayfortheswitchsothatitcancommunicatewithothernetworks.ItdoesnotconfiguretheswitchtouseaDHCPserver,enableSSH,orcreateaVLAN.45.InOSPF,whatistheroleoftheDesignatedRouter(DR)?A.ToblockalltrafficonamultiaccessnetworkB.TogenerateType2LSAsandmanagetheadjacencyonamultiaccessnetworkC.ToprovideDHCPservicesD.ToconfigureVLANsAnswer:BAnalysis:InOSPF,theDesignatedRouter(DR)onamultiaccessnetworkgeneratesType