计算机网络英文题库(附答案)chapter5

Chapter5TheLinkLayerandLocalAreaNetwork1．A()protocolisusedtomoveadatagramoveranindividuallink.Aapplication-layerBtransport-layerCnetwork-layerDlink-layer2．Theunitsofdataexchangedbyalink-layerprotocolarecalled().AdatagramsBframesCsegmentsDmessages3．Whichofthefollowingprotocolsisnotalink-layerprotocol?()AEthernetBPPPCHDLCDIP4．Inthefollowingfourdescriptions,whichoneisnotcorrect?()Alink-layerprotocolhasthenode-to-nodejobofmovingnetwork-layerdatagramsoverasinglelinkinthepath.BTheservicesprovidedbythelink-layerprotocolsmaybedifferent.CAdatagrammustbehandledbythesamelink-layerprotocolsonthedifferentlinksinthepath.DTheactionstakenbyalink-layerprotocolwhensendingandreceivingframesincludeerrordetection,flowcontrolandrandomaccess.5．Whichofthefollowingservicescannotofferedbyalink-layerprotocol?()AcongestioncontrolBLinkAccessCErrorcontrolDFraming6．()protocolservestocoordinatetheframetransmissionsofthemanynodeswhenmultiplenodesshareasinglebroadcastlink.AARPBMACCICMPDDNS7．Inthefollowingfourdescriptionsabouttheadapter,whichoneisnotcorrect?()ATheadapterisalsocalledasNIC.BTheadapterisasemi-autonomousunit.CThemaincomponentsofanadapterarebusinterfaceandthelinkinterface.DTheadaptercanprovideallthelink-layerservices.8．ConsiderCRCerrorcheckingapproach,thefourbitgeneratorGis1011,andsupposethatthedataDis10101010,thenthevalueofRis().A010B100C011D1109．Inthefollowingfourdescriptionsaboutrandomaccessprotocol,whichoneisnotcorrect?()AInslottedALOHA,nodescantransmitatrandomtime.BInpureALOHA,ifaframeexperiencesacollision,thenodewillimmediatelyretransmititwithprobabilityp.CThemaximumefficiencyofaslottedALOHAishigherthanapureALOHA.DInCSMA/CD,onenodelistenstothechannelbeforetransmitting.10．InthefollowingdescriptionsaboutMACaddress,whichoneisnotcorrect?()ATheMACaddressistheaddressofonenode’sadapter.BNotwoadaptershavethesameMACaddress.CTheMACaddressdoesn’tchangenomatterwheretheadaptergoes.DMACaddresshasahierarchicalstructure.11．TheARPprotocolcantranslate()into().()Ahostname,IPaddressBhostname,MACaddressCIPaddress,MACaddressDbroadcastaddress,IPaddress12．ThevalueofPreamblefieldinEthernetframestructureis()A1010101010101010……1010101011111111B1010101110101011……1010101110101011C1010101010101010……1010101010101011D1010101010101010……101010101010101013．TherearefourstepsinDHCP,theDHCPservercancomplete().ADHCPserverdiscoveryBDHCPserveroffersCDHCPrequestDDHCPresponse14．InCSMA/CD,theadapterwaitssometimeandthenreturnstosensingthechannel.Inthefollowingfourtimes,whichoneisimpossible?()A0bittimesB512bittimesC1024bittimesD1028bittimes15．ThemostcommonEthernettechnologiesare10BaseTand100BaseT.“10”and“100”indicate().AthemaximumlengthbetweentwoadaptersBtheminimumlengthbetweentwoadaptersCthetransmissionrateofthechannelDthetransmissionrateofthenode16．TheprincipalcomponentsofPPPincludebutnot().AframingBphysical-controlprotocolClink-layerprotocolDnetwork-layerprotocol17．Inthefollowingfouroptions,whichservicecannotbeprovidedbyswitch?()AfilteringBself-learningCforwardingDoptimalrouting18．Inthefollowingfourservices,whichonewasberequiredinPPP?()ApacketframingBerrordetectionCerrorcorrectionDmultipletypesoflink19．Theabilitytodeterminetheinterfacestowhichaframeshouldbedirected,andthendirectingtheframetothoseinterfacesis().AfilteringBforwardingCself-learningDoptimalrouting20．In()transmission(s),thenodesatbothendsofalinkmaytransmitpacketsatthesametime.Afull-duplexBhalf-duplexCsingle-duplexDbothfull-duplexandhalf-duplex21．ConsiderthedataDis01110010001,ifuseevenparitycheckingapproach,theparitybitis(①),ifuseoddparitycheckingapproach,theparitybitis(②).()A①0②1B①0②0C①1②1D①1②022．Inthefollowingfourdescriptionsaboutparitychecks,whichoneiscorrect?()ASingle-bitparitycandetectallerrors.BSingle-bitparitycancorrectoneerrors.CTwo-dimensionalparitynotonlycandetectasinglebiterror,butalsocancorrectthaterror.DTwo-dimensionalparitynotonlycandetectanycombinationoftwoerrors,butalsocancorrectthem.23．MACaddressis()bitslong.A32B48C128D6424．WirelessLANusingprotocol().AIEEE802.3BIEEE802.4CIEEE802.5DIEEE802.1125．Thefollowingprotocolsarebelongingtomultipleaccessprotocolsexceptfor().AchannelpartitioningprotocolsBroutingprotocolsCrandomaccessprotocolsDtaking-turnsprotocols26．Whichofthefollowingisnotbelongingtochannelpartitioningprotocols?()ACSMABFDMCCDMADTDM27．InthefollowingfourdescriptionsaboutCSMA/CD,whichoneisnotcorrect?()AAnodelistenstothechannelbeforetransmitting.BIfsomeoneelsebeginstalkingatthesametime,stoptalking.CAtransmittingnodelistenstothechannelwhileitistransmitting.DWithCSMA/CD,thecollisionscanbeavoidedcompletely.28．()providesamechanismfornodestotranslateIPaddressestolink-layeraddress.AIPBARPCRARPDDNS29．AMACaddressisa()address.Aphysical-layerBapplication-layerClink-layerDnetwork-layer30．Whichofthefollowingiscorrect?()ANotwoadaptershavethesameMACaddress.BMACbroadcastaddressisFF-FF-FF-FF-FF-FF.CAportablecomputerwithanEthernetcardalwayshasthesameMACaddress,nomatterwherethecomputergoes.DAlloftheabove31．Inthefollowingfourdescriptions,whichoneisnotcorrect?()AARPresolvesanIPaddresstoaMACaddress.BDNSresol