计算机水平考试-网络管理员分类模拟题计算机专业英语(一)

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1、一、单项选择题EachmachinesupportingTCPhasaTCPtransportentity,eitheralibraryprocedure,auserprocesszorpartofthekernel•Inallcase,itmanagesTCPstreamsand1totheIPlayer.ATCP2Acceptsuserdatestreamsfromlocalprocess,breaksthemintopiecesnotexceeding64KB,andsendseachpieceasaseparateIP3.Whendatagramsconta

2、iningTCPdatearriveatamachine,theyaregiventotheTCPentity,whichreconstructstheoriginalbytestreams.TheIPlayergivesnoguaranteethatdatagramswillbedeliveredproperly,soitisuptoTCPtotimeoutand4themasneedbe.Datagramsdoarrivemaywelldosointhewrongorder,itisalsouptoTCPto5themintomessagesintheprope

3、rsequence・1、A.callsB•interfacesC.linksD•produces2、A.connectionB.fileC.entityD.destination3、A.dategramB.streamC•connectionD•transaction4、A.reassembleB.reduceC•re-createD•retransmit5、A.reassembleB.reduceC•re-createD•retransmitAmulticastroutermayreceivethousandsofmulticast6everydayfordiff

4、erentgroups.Ifarouterhasnoknowledgeaboutthemembershipstatusofthe7,itmustbroadcastallofthesepackets.Thiscreatesalotoftrafficandconsumes8,Abettersolutionistokeepalistofgroupsinthenetworkforwhichthereisatleastoneloyalmember.9helpsthemulticastroutercreateandupdatethislist.Foreachgroup,ther

5、eisonerouterthathasthedutyofdistributingthe10packetsdestinedforthatgroup.Thismeansthatiftherearethreemulticastroutersconnectedtoanetwork,theirlistsofgroupidsaremutuallyexclusive.Ahostormulticastroutercanhavemembershipinagroup.6、A.packetsB.errorsC•reportsD.alarms7、A.routersB.networkC・pa

6、cketsD.hosts8、A.capabilityB.powerC•bandwidthD.address9、A.ICMPB・IGMPC・OSPFD・RID10、A.•anycastB•multicastC.unicastD•broadcastAtransportlayerprotocolhasseveralresponsibilities,Oneistocreateaprocess-to-process(program-to-program)communication；TCPusesport11toaccomplishthis.Anotherresponsibil

7、ityofatransportlayerprotocolistocreatea12anderror-controlmechanismatthetransportlevel-TCPusesasliding13protocoltoachieveflowcontrol•Itusestheacknowledgmentpacket,time-out,andretransmissiontoachieve14control.Thetransportlayerisalsoresponsibleforprovidingaconnectionmechanismfortheappli