问答题

WhichthreestatementsaretrueabouttheapplianceofQoSmodels？（）

A.theDiffServmodelrequiresapplicationstosignalthenetworkwithQoSrequirements
B.theDiffServmodelcanbeusedtodeliverQoSbaseduponIPprecedence，orsourceanddestinationaddresses
C.theDiffServmodelrequiresRSVP
D.thebesteffortmodelissuitableforapplicationssuchasfiletransferande-mail
E.theIntServmodelrequiresapplicationstosignalthenetworkwithQoSrequirements
F.theIntServmodelmodelattemptstodeliveralevelofservicebasedontheQoSspecifiedbyeachpacket

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A.ippimrp-address
B.ippimssm
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WhichfourstatementsaboutanIPservicelevelagreement（SLA）aretrue？（）

A.SLAresponderknowstypeofoperation，theportused，andduration.
B.SLAresponderinsertsinandouttimestampsinthepacketpayload.
C.SLAsenderandresponderusetheIPSLAControlProtocoltocommunicatewitheachotherbefore
D.SLAsenderandrespondercommunicationcanbeencrypted.
E.SLAsenderandrespondercommunicationcanbeauthenticatedwithMD5.