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1、《Computernetwork》MidtermExaminationName:Studentnumber:100minI.Choice.1．The()isaworldwidecomputernetwork,thatis,anetworkthatinterconnectsmillionsofcomputingdevicesthroughouttheworld.AInternetBIntranetCswitchnetDtelevisionnet2．Theunitsofdataexchangedbyalink-layerprotocolarecalle
2、d().AFramesBSegmentsCDatagramsDbitstreams3．()meansthattheswitchmustreceivetheentirepacketbeforeitcanbegintotransmitthefirstbitofthepacketontotheoutboundlink.AStore-and-forwardtransmissionBFDMCEnd-to-endconnectionDTDM4．Inthefollowingoptions,whichoneisnotaguided(有线)media?()Atwis
3、ted-pairwireBfiberopticsCcoaxialcableDsatellite5．Delaydoesnotinclude().AProcessdelayBpropagationdelayCtransmissiondelayDcontroldelay6.Inthefollowingoptions,whichbelongstothenetworkcore?()AendsystemsBroutersCclientsDservers7．TheInternet’sconnection-orientedservicehasaname,itis(
4、).ATCPBUDPCTCP/IPDIP8．Therearetwofundamentalapproachestobuildinganetworkcore,()andpacketswitching.AelectricalcurrentswitchingBcircuitswitchingCdataswitchingDmessageswitching9．A()protocolisusedtomoveadatagramoveranindividuallink.Aapplication-layerBtransport-layerCnetwork-layerD
5、link-layer10．Whichofthefollowingprotocolsisnotalink-layerprotocol?()AEthernetBPPPCHDLCDIP11．ConsiderCRCerrorcheckingapproach,thefourbitgeneratorGis1011,andsupposethatthedataDis10101010,thenthevalueofRis().A010B100C011D11012．TheARPprotocolcantranslate()into().()Ahostname,IPaddr
6、essBhostname,MACaddressCIPaddress,MACaddressDbroadcastaddress,IPaddress13．InthefollowingdescriptionsaboutMACaddress,whichoneisnotcorrect?()ATheMACaddressistheaddressofonenode’sadapter.BNotwoadaptershavethesameMACaddress.CTheMACaddressdoesn’tchangenomatterwheretheadaptergoes.DM
7、ACaddresshasahierarchicalstructure.14．InCSMA/CD,theadapterwaitssometimeandthenreturnstosensingthechannel.Inthefollowingfourtimes,whichoneisimpossible?()A0bittimesB512bittimesC1024bittimesD1028bittimes15．ThemostcommonEthernettechnologiesare10BaseTand100BaseT.“10”and“100”indicat
8、e().AthemaximumlengthbetweentwoadaptersBtheminimumlengthbetwe
