642691考试指南及题库分享.docx
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642-691Exam
CCIPBGP+MPLSExam（BGP+MPLS）
科目编号：
642-691
科目名称：
CCIPBGP+MPLSExam（BGP+MPLS）
相关认证：
CCIP
时间：
90分钟（60-70题）
可用语言：
英语
642-691考试是Cisco公司的CCIPBGP+MPLSExam（BGP+MPLS）认证考试官方代号，CCIPBGP+MPLSExam（BGP+MPLS）认证作为全球IT领域专家Cisco热门认证之一，是许多大中IT企业选择人才标准的必备条件。
思科职业认证考试包括以下测试格式：
多项选择题单选题
多项选择题的答案多
Drag-and-drop
填空
Testlet
Simlet
模拟
642-691考试描述
TheBGP+MPLSexamisthequickestwayforcurrentlycertifiedCCIP（CiscoCertifiedInternetworkProfessionals）toobtainrecertification.TheexamtestsskillsandknowledgepertainingtotheConfiguringBGPonCiscoRouters（BGP）andImplementingCiscoMPLS（MPLS）courses.BGP+MPLSmaybetakentorecertifyyourCCIPcertification.ItmayalsobetakeninplaceoftheBGPandMPLSexamsrequiredfortheCCIPcertification.
考试大纲：
ThefollowinginformationprovidesgeneralguidelinesforthecontentlikelytobeincludedontheBGP+MPLSExam.However,otherrelatedtopicsmayalsoappearonanyspecificdeliveryoftheexam.
Technology
UnderstandandexplainCoreMPLStechnologyandconcepts
UnderstandandexplainMPLSVPNtechnologyandconcepts
UnderstandandexplainbasicBGPconceptsandoperations
UnderstandandexplainhowtoScaleIGPandBGPinServiceProviderNetworks
BasicImplementation&Configuration
ExplainandimplementFrame-modeMPLSoperationsonCiscoIOSPlatforms
ExplainandimplementCell-modeMPLSoperationsonCiscoIOSPlatforms
ExplainandimplementBGPRouteSelectionUsingPolicyControlsonCiscoIOSPlatforms
ExplainandimplementBGPRouteSelectionUsingBGPAttributesonCiscoIOSPlatforms
ExplainandimplementCustomer-to-ProviderConnectivitywithBGPonCiscoIOSPlatforms
ExplainandimplementBGPTransitAutonomousSystemonCiscoIOSPlatforms
ExplainandimplementIBGPconnectivityusingBGPRouteReflectorsonCiscoIOSPlatforms
ExplainandimplementBGPConfederationsonCiscoIOSPlatforms
AdvancedConfiguration
ExplainandimplementAdvancedBGPConfigurationonCiscoIOSPlatforms
ExplainandimplementMPLSVPNoperationsonCiscoIOSPlatforms
ExplainandimplementOSPFinsideanMPLSVPN
考试题库：
Exam:
Cisco642-691
Title:
CiscoCCIPBGP+MPLSExam（BGP+MPLS）
1.Refertotheexhibit.WhichtwoofthefollowingstatementsabouttheMPLSconfigurationsaretrue?
（Choosetwo.）
A.TheVPIrangebeingconfiguredisthedefaultVPIrange.
B.TherouterismissingthemplslabelprotocolldpconfigurationcommandonitsATM0/0.1subinterfacetomakeit
anLC-ATMenabledsubinterface.
C.ThereisaproblemwiththeconfigurationsbecausethecontrolVCshouldbesetto032instead.
D.TheATMswitchisusingVCmergesinceVCmergeisenabledbydefault.
E.ForMPLSlabelallocations,bothVPI6and7canbeused.
Answer:
DE
2.WhichtwostatementsaboutatransitASarecorrect?
（Choosetwo.）
A.AtransitAShaseBGPconnection（s）toonlyoneexternalAS.
B.RoutesbetweenASsarealwaysexchangedviaeBGP.
C.AtransitASusesanIGPlikeOSPForISIStopropagatetheexternalnetworkswithinthetransitAS.
D.CorerouterswithinatransitASnormallyusedefaultroutingtoreachtheexternalnetworks.
E.iBGPsessionscanbeestablishedbetweennondirectlyconnectedrouters.
Answer:
BE
3.Whichcommandisusedtoconfiguretheexternal,confederation-wideASnumber?
A.router（config）#routerbgp{as-number}
B.router（config-router）#bgpconfederationpeers{as-number}
C.router（config-router）#bgpconfederationidentifier{as-number}
D.router（config-router）#bgpcluster-id{as-number}
E.router（config-router）#neighbor{ipaddress}remote-as{as-number}
Answer:
C
4.Basedonthetopologydiagramshownintheexhibit,whenshouldBGPbeusedastheroutingprotocolbetween
thecustomerandtheISP?
A.Ifphysicallinkfailurescannotbedetectedbythelink-levelprocedures.
B.IfthecustomerwantstoaffecthowtheISPwillroutethecustomer'strafficouttotherestoftheInternet.
C.IftheISPdoesnotsupportstaticroutingwiththecustomer.
D.Ifthecustomerisusingprovider-assigned（PA）addressesinsidethecustomer'snetwork.
E.Ifthecustomerisusingprivateaddressesinsidethecustomer'snetwork.
Answer:
A
5.WhichshowcommandcanbeusedtodisplaytheoriginatorIDandcluster-list?
A.showipbgp
B.showipbgpsum
C.showiproutebgp
D.showiproute{prefix}
E.showipbgp{prefix}
F.showipbgpneighbors{ipaddress}
Answer:
E
6.Basedonthenetworkdiagramshownintheexhibit,whatisthecorrectconfigurationonthecustomeredgerouter
usedtoconditionallyannouncethecustomernetworkstotheISP?
A.routerbgp65001
!
neighborcommandsnotshown
network192.168.8.0mask255.255.252.0
!
iproute192.168.8.0255.255.252.0192.168.8.33
B.routerbgp65001
!
neighborcommandsnotshown
aggregate-address192.168.8.0255.255.252.0summary-only
!
iproute192.168.8.0255.255.252.0192.168.8.33
C.routerbgp65001
!
neighborcommandsnotshown
network192.168.8.0
network192.168.9.0
network192.168.10.0
network192.168.11.0
!
iproute192.168.8.0255.255.255.0null0
iproute192.168.9.0255.255.255.0null0
iproute192.168.10.0255.255.255.0null0
iproute192.168.11.0255.255.255.0null0
D.routerbgp65001
!
neighborcommandsnotshown
aggregate-address192.168.8.0255.255.252.0summary-only
!
routerospf1
network192.168.8.00.0.3.255area0
E.routerbgp65001
!
neighborcommandsnotshown
aggregate-address192.168.8.0255.255.252.0
!
iproute192.168.8.0255.255.252.0null0
Answer:
A
7.Asthepenaltyforaflappingroutedecreasesandfallsbelowacertainlimit,therouteisunsuppressed.Whatisthe
nameofthatlimit?
A.half-lifelimit
B.suppresslimit
C.max-suppress-timelimit
D.reuselimit
E.unsuppresslimit
F.penaltylimit
Answer:
D
8.Refertothediagram.WhatproblemcanbecausedbythesecondProutersummarizingtheloopbackaddressof
theegressPErouter?
A.ThefirstProuterwillbefacedwithaVPNlabelwhichitdoesnotunderstand.
B.ThesecondProuterwillbefacedwithaVPNlabelwhichitdoesnotunderstand.
C.TheegressPErouterwillnotbeabletoestablishalabelswitchpath（LSP）totheingressPErouter.
D.Alabelswitchpath（LSP）willbeestablishedfromtheingressPEroutertotheegressPErouter,aneventthatis
notdesirable.
E.TheingressPErouterwillnotbeabletoreceivetheVPNlabelfromtheegressPErouterviaMP-IBGP.
Answer:
B
9.WhichtwoofthefollowingstatementsregardingLDParetrue?
（Choosetwo.）
A.LDPcanalsobeusedbetweennonadjacentroutersusingmulticastLDPhellomessages.
B.LDPdoesnotrequireperiodichellomessagesoncetheLDPsessionhasbeenestablishedbetweentheLDP
peers.
C.LDPhellomessagesuseTCPpacketswithadestinationportnumberof646.
D.MultiplesessionscanbeestablishedbetweenapairofLSRsiftheyusemultiplelabelspaces.
E.Per-platformlabelspacecanbeidentifiedbyalabelspaceIDof0intheLDPidentifierfield.
Answer:
DE
10.Inacentralservicestopology,whichroutesdoclientVRFscontain?
A.routesfromtheclientsite,butnotfromtheserversite
B.routesfromtheserversite,butnotfromtheclientsite
C.routesfromboththeclientsiteandtheserversite
D.onlyEBGProutesfromeithertheclientsiteortheserversite
Answer:
C
11.Forwhichpurposeisthecommandmplsldpmaxhopsused?
A.InlargeATM-MPLSnetworks,theLFIBcanbecometoolargeanditmaybenecessarytolimitthemaximum
diameteroftheMPLSLSPs.
B.Becausedownstream-on-demandlabelallocationuseshopcounttocontrolloopdetection,itmaybenecessaryto
limitthemaximumdiameteroftheMPLSnetwork.
C.Becauseend-to-enddelaycancauseproblemswithsomevoiceapplications,itmaybenecessarytolimitthe
maximumdiameteroftheMPLSnetwork.
D.WheninterconnectinglargeframemodeMPLSandcellmodenetworksitmaybenecessarytolimitthemaximum
networkdiametertopreventforwardingloops.
Answer:
B
12.Onadedicatedsubinterfaceimplementation,PE-2mustestablishanaddress-familyvrfIPv4BGPneighbor
relationshipwithwhichrouter?
A.CE-1
B.CE-2
C.PE-1
D.PE-IG
E.CE-1andCE-2
F.PE-1andPE-IG
Answer:
B
13.Basedonthenetworkdiagramshownintheexhibit,bothR5andR6areclientsoftheR2RR.Whenthe
10.0.0.0/8iBGPupdatefromR3isreceivedbytheR2RR,whichrouter（s）willR2reflecttheupdateto?
A.R1only
B.R5andR6
C.R5,R6andR1
D.R4,R5andR6
E.R4,R5,R6andR1
F.tonootherrouter
Answer:
C
14.Whatarethreedrawbacksofapeer-to-peerVPNusingasharedprovideredge（PE）router?
（Choosethree.）
A.Afullmeshofvirtualcircuitsisrequiredbetweenthecustomersites.
B.AllthecustomershavetoshareacommonIPaddressspace.
C.Optimalroutingbetweencustomersitescannotbeguaranteed.
D.ThesharedPErouterhastoknowallroutesforallcustomers.
E.PacketfiltersarerequiredonthePErouters.
Answer:
BDE
15.Whatdoesthefollowingcommandaccomplish?
sanjose#clearipbgp10.1.1.1inprefix-filter
A.Thesanjoserouterwillperformanoutboundsoftreconfigtothe10.1.1.1neighbor.
B.ThesanjoserouterwillsendouttheORFprefix-listsothatanewrouterefreshwillbereceivedfromthe10.1.1.1
neighbor.
C.The10.1.1.1routerwillperformaninboundsoftreconfigontheupdatesfromthesanjoseneighbor.
D.The10.1.1.1routerwillsendouttheORFprefix-listsothatanewrouterefreshwillbereceivedfromthesanjose
neighbor.
E.Thebgpsessionbetweenthesanjoseandthe10.1.1.1routerwillberesetsothatallthenewbgpupdatesfromthe
10.1.1.1route
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