CCIE笔试题库

Vendor:350-001ExamCode:CCIE-RoutingandSwitchingWrittenexam(4.0)ExamName:CISCO分卷:A1:WhatisthepurposeofanexplicitdenyanystatementattheendofanACL?A.none,sinceitisimplicitB.toenableCiscoIOSIPStoworkproperly;however,itisthedenyalltrafficentrythatisactuallyrequiredC.toenableCiscoIOSFirewalltoworkproperly;however,itisthedenyalltrafficentrythatisactuallyrequiredD.toallowthelogoptiontobeusedtologanymatchesE.topreventsyncfloodattacksF.topreventhalf-openedTCPconnectionsCorrectAnswers:DExplanation:2:WhichoftheseismandatorywhenconfiguringCiscoIOSFirewall?A.CiscoIOSIPSenabledontheuntrustedinterfaceB.NBARenabledtoperformprotocoldiscoveryanddeeppacketinspectionC.aroutemaptodefinethetrustedoutgoingtrafficD.aroutemaptodefinetheapplicationinspectionrulesE.aninboundextendedACLappliedtotheuntrustedinterfaceCorrectAnswers:EExplanation:3:WhichstatementcorrectlydescribesthedisablingofIPTTLpropagationinanMPLSnetwork?A.TheTTLfieldfromtheIPpacketiscopiedintotheTTLfieldoftheMPLSlabelheaderattheingressedgeLSR.B.TTLpropagationcannotbedisabledinanMPLSdomain.C.TTLpropagationisonlydisabledontheingressedgeLSR.D.TheTTLfieldoftheMPLSlabelheaderissetto255.E.TheTTLfieldoftheIPpacketissetto0.CorrectAnswers:DExplanation:4:TworoutersconfiguredtorunBGPhavebeenconnectedtoafirewall,oneontheinsideinterfaceandoneontheoutsideinterface.BGPhasbeenconfiguredsothetworoutersshouldpeer,includingthecorrectBGPsessionendpointaddressesandthecorrectBGPsessionhop-countlimit(EBGPmultihop).WhatisagoodfirsttesttoseeifBGPwillworkacrossthefirewall?A.AttempttoTELNETfromtherouterconnectedtotheinsideofthefirewalltotherouterconnectedtotheoutsideofthefirewall.Iftelnetworks,BGPwillwork,sincetelnetandBGPbothuseTCPtotransportdataB.Pingfromtherouterconnectedtotheinsideinterfaceofthefirewalltotherouterconnectedtotheoutsideinterfaceofthefirewall.Ifyoucanpingbetweenthem,BGPshouldwork,sinceBGPusesIPtotransportpackets.C.ThereisnowaytomakeBGPworkacrossafirewallwithoutspecialconfiguration,sothereisnosimpletestthatwillshowyouifBGPwillworkornot,otherthantryingtostartthepeeringsession.D.ThereisnowaytomakeBGPworkacrossafirewall.CorrectAnswers:AExplanation:5:SpanningTreeProtocolIEEE802.1sdefinestheabilitytodeploywhichofthese?A.oneglobalSTPinstanceforallVLANsB.oneSTPinstanceforeachVLANC.oneSTPinstancepersetofVLANsD.oneSTPinstancepersetofbridgesCorrectAnswers:CExplanation:6:WhichtwooftheseareusedintheselectionofarootbridgeinanetworkutilizingSpanningTreeProtocolIEEE802.1D?(Choosetwo.)选项A.DesignatedRootCostB.bridgeIDpriorityC.maxageD.bridgeIDMACaddressE.DesignatedRootPriorityF.forwarddelayCorrectAnswers:BD7:IfaportconfiguredwithSTPloopguardstopsreceivingBPDUs,theportwillbeputintowhichstate?A.learningstateB.listeningstateC.forwardingstateD.root-inconsistentstateCorrectAnswers:DExplanation:8:WhatisthepurposeoftheSTPPortFastBPDUguardfeature?A.enforcetheplacementoftherootbridgeinthenetworkB.ensurethataportistransitionedtoaforwardingstatequicklyifaBPDUisreceivedC.enforcethebordersofanSTPdomainD.ensurethatanyBPDUsreceivedareforwardedintotheSTPdomainCorrectAnswers:CExplanation:9:WhenSTPUplinkFastisenabledonaswitchutilizingthedefaultbridgepriority,whatwillthenewbridgeprioritybechangedto?A.8192B.16384C.49152D.65535CorrectAnswers:CExplanation:10:WhichofthesebestdescribestheactionstakenwhenaVTPmessageisreceivedonaswitchconfiguredwiththeVTPmodetransparent?A.VTPupdatesareignoredandforwardedoutallports.B.VTPupdatesareignoredandforwardedouttrunksonly.C.VTPupdatesaremadetotheVLANdatabaseandareforwardedouttrunksonly.D.VTPupdatesareignoredandarenotforwarded.CorrectAnswers:BExplanation:11:Refertotheexhibit.Inthisnetwork,R1hasbeenconfiguredtoadvertiseasummaryroute,192.168.0.0/22,toR2.R2hasbeenconfiguredtoadvertiseasummaryroute,192.168.0.0/21,toR1.Bothroutershavebeenconfiguredtoremovethediscardroute(theroutetonullcreatedwhenasummaryrouteisconfigured)bysettingtheadministrativedistanceofthediscardrouteto255.WhatwillhappenifR1receivesapacketdestinedto192.168.3.1?A.ThepacketwillloopbetweenR1andR2.B.Itisnotpossibletosettheadministrativedistanceonasummaryto255.C.ThepacketwillbeforwardedtoR2,whereitwillberoutedtonull0.D.ThepacketwillbedroppedbyR1,sincethereisnorouteto192.168.3.1.CorrectAnswers:AExplanation:12:Refertotheexhibit.Inthisnetwork,R1isconfigurednottoperformautosummarizationwithinEIGRP.WhatrouteswillR3learnfromR2throughEIGRP?A.172.30.1.0/24and10.1.2.0/24;EIGRPonlyperformsautosummarizationattheedgebetweentwomajornetworks.B.172.30.0.0/16and10.1.2.0/24;R2willperformautosummarization,althoughR1willnot.C.SinceR2isconfiguredwithoutautosummarization,itwillnotpropagatethe172.30.1.0/24route.D.172.30.0.0/8and10.0.0.0/8.CorrectAnswers:AExplanation:13:TheclassicSpanningTreeProtocol(802.1D1998)useswhichsequenceofvariablestodeterminethebestreceivedBPDU?A.1)lowestrootbridgeid,2)lowestsenderbridgeid,3)lowestportid,4)lowestrootpathcostB.1)lowestrootpathcost,2)lowestrootbridgeid,3)lowestsenderbridgeid,4)lowestsenderportidC.1)lowestrootbridgeid,2)lowestsenderbridgeid,3)lowestrootpathcost4)lowestsenderportidD.1)lowestrootbridgeid,2)