HCDP英文版最新版多选题Word文件下载.docx

HCDP英文版最新版多选题Word文件下载.docx

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CFaultsneveroccur.

DServicescanonlybemanuallyrestoredwhenafaultoccurs.

AB

2.WhichofthefollowingstatementsaboutBFDcontrolpacketsaretrue?

ABFDcontrolpacketisencapsulatedinaUDPpacketfortransmission.

BBFDdetectionisnotavailableinVRP5.7

CEchopacketsuseUDPdestinationportnumber3784.

DEchopacketsuseUDPdestinationportnumber3785.

ABC

3.WhichofthefollowingstatementsabouttheBFDasynchronousmodearetrue?

AThelocalsystemregularlysendBFDcontrolpackets,andtheremotesystemdetectstheBFDcontrolpacketssentfromthelocalsystem.

BThelocalsystemdetectstheBFDcontrolpacketssentbyitself.

CIfonesystemdoesnotreceiveanyBFDpacketsfromitspeerwithinadetectionperiod,itadvertisesasessiondownevent.

DEachsystemconfirmsitsconnectionswithothersystemsinaparticularmethod.AfteraBFDseeionissetup,BFDcontrolpacketsarenolongersent.

AC

4.WhichofthefollowingstatementsabouttheBFDdemandmodearetrue?

AThelocalsystemregularlysendBFDcontrolpackets,andtheremotesystemdetectstheBFDcontrolpacketssentfromthelocalsystem

BD

5.WhichofthefollowingstatementsabouttheBFDechofunctionaretrue?

AThelocalsystemsendsaseriesofBFDEchopackets,andtheremotesystemloopsthepacketsbackthroughitsforwardingchannel.

BIfthelocalsystemdoesnotreceiveseveralconsecutiveEchopackets,itadvertisesasessiondownevent.

CTheechofunctioncanworktogetherwiththeasynchronousordemanddetectionmode.

DTheechofunctioncantaketheplaceoffaultdetectionbysendingBFDcontrolpackets.

ABCD

6.Whichofthefollowingstatementsaboutasmartlinkgrouparetrue?

ASmartlinkgroupconsistsofamaximumoftwointerfaces,wheretherearetwointerfaces,oneisanactiveinterface,andtheotherastandbyinterface.

BOfthetwointerfaceinasmartlinkgroup,oneisactive,andtheotherisstandby.

Cwhenanactiveinterfacegoesdown,theSmartlinkgroupautomaticallyblocksitandchangesthestatusofthestandbyinterfacetoactive.

Dwhenanactiveinterfacerecovers,thestandbyinterfaceisblockedandtrafficisswitchedbacktotheactiveinterface.

7.WhichofthefollowingstatementsaboutFlushpacketsinasmartlinkgrouparetrue?

AAsmartlinkgroupsendsflushpacketstoinstructotherdevicestoupdatetheaddresstable.

BFlushpacketsuseIEEE802.3encapsulation.

CThedestinationMACaddressofFulshpacketsisanunknownunicastaddress,whichisusedtodistinguishprotocols.

DThedestinationMACaddressofflushpacketsisaspecialmulticastaddress,whichisusedtodistinguishprotocols.

8.Whenlinksareswitchedinasmartlinkgroup,whichofthefollowingmechanismscanbeusedtorefreshMACandARPentries?

AMACandARPentriesarerefreshedautomaticallywithrespecttotraffic.

BThesmartlinkgroupusesanewlinktosendflushpackets.

CMACentriesarerefreshedaftertheagingtimeexpires.

DARPentriesarerefreshedaftertheagingtimeexpires.

9.Whichofthefollowingstatementsaboutlinkaggregationaretrue?

Alinkaggregationbindsagroupofphysicalinterfacestogetherasalogicalinterfacetoincreasethebandwidthandreliability.

BLinkaggregationcomplieswithIEEE802.3ah.

CThelogicallinkformedbybundlingmultiplephysicallinkstogetheriscalledalinkaggregationgroup（LAG）oratrunk.

DActiveandinactiveinterfacesexistinlinkaggregation,Activeinterfacesforwarddata,whereasinactiveinterfacesdonot.

10.Whichofthefollowingstatementsaboutlinkaggregationaretrue?

ALinkaggregationcanbeperformedinmanualloadbalancingorLACPmode.inmanualloadingbalancingmode,LACPisdisabled:

inLACPmode,LACPisenabled.

BInmanualloadbalancingmode,allactivememberinterfacesforwarddataandperformloadbalancing.

CInstaticLACPmode,thecreationoftheEth-TrunkandtheadditionofmemberinterfacestotheEth-Trunkareperfaormedmanually.Comparedwithlinkaggregationinmanualloadbalancingmode,activeinterfacesinstaticLACPmodeareseletedbysendingLACPdataunits（LACPDUs）.

DIndynamicLACPmode,thecreationoftheEth-Trunk,theadditionofmemberinterfaces,andtheselectionofactiveinterfacesareperformedbasedonLACPnegotiation.

11.WhichofthefollowingstatementsaboutLACPare