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单项选择题

A.SentbythedestinationB.ReceivedbythesenderC.Receivedby……

InFrameRelay，FECNmessagesindicatingcongestionaresentorreceivedbywhichoffollowing？（）

A.Sentbythedestination
B.Receivedbythesender
C.Receivedbythedestination
D.Sentbythesender
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单项选择题Inaframe，theMPLSlabelisimposed（）.

A.AftertheLayer3headerandbeforeLayer2header
B.AftertheLayer2headerandbeforeLayer3header
C.WithintheLayer3header
D.Beforethelayer2header

单项选择题BGPbestrouteselectionprocessisbasedonpathattributes.（）

A.True
B.False

单项选择题AnewBackupConnectionisbeingdeployedonaremotesiterouter.thestabilityoftheconnectionhasbeenaconcern.inordertoprovidemoreinformationtoEIGRPRegardingthisinterface，Youwishtoincorporatethe'Reliability'costmetricintheEIGRPCalculationwiththecommandmetricweights10101.WhatimpactwillthismodificationontheremotesiterouterhaveforotherexistingEIGRPneighborshipsfromthesameEIGRPDomain？（）A.ExistingNeighborswillimmediatelybeginusingthenewmetric.B.ExistingNeighborswillusethenewmetricafterclearingtheEIGRPNeighbors.C.ExistingNeighborswillresync，maintainingtheneighborrelationshipD.Allecistingneighborrelationshipswillgodown

A.thestabilityoftheconnectionhasbeenaconcern.inordertoprovidemoreinformationtoEIGRPRegardingthisinterface，Youwishtoincorporatethe'Reliability'costmetricintheEIGRPCalculationwiththecommandmetricweights10101.WhatimpactwillthismodificationontheremotesiterouterhaveforotherexistingEIGRPneighborshipsfromthesameEIGRPDomain？（）
A.ExistingNeighborswillimmediatelybeginusingthenewmetric.
B.ExistingNeighborswillusethenewmetricafterclearingtheEIGRPNeighbors.
C.ExistingNeighborswillresync，maintainingtheneighborrelationship
D.Allecistingneighborrelationshipswillgodown

单项选择题HowisRPFusedinmulticastrouting？（）

A.topreventmulticastpacketsfromlooping
B.topreventPIMpacketsfromlooping
C.toinstructPIMwheretosenda（*，G）or（S，G）joinmessage
D.topreventmulticastpacketsfromloopingandtoinstructPIMwheretosenda（*，G）or（S，G）joinmessage

单项选择题WhichstatementistrueaboutaSmurfattack？（）

A.Itsendspingrequestsinsegmentsofaninvalidsize
B.ItinterceptsthethirdstepinaTCPthree-wayhandshaketohijackasession
C.Itsendspingrequeststoasubnet，requestingthatdevicesonthatsubnetsendpingrepliestoatargetsystem
D.ItusesTrojanhorseapplicationstocreateadistributedcollectionof"zombie"computers，whichcanbeusedtolaunchacoordinatedDDoSattack