期中考試-計(jì)算機(jī)網(wǎng)絡(luò)

期中考試--計(jì)算機(jī)網(wǎng)絡(luò)期中考試--計(jì)算機(jī)網(wǎng)絡(luò)期中考試--計(jì)算機(jī)網(wǎng)絡(luò)xxx公司期中考試--計(jì)算機(jī)網(wǎng)絡(luò)文件編號：文件日期：修訂次數(shù)：第1.0次更改批準(zhǔn)審核制定方案設(shè)計(jì)，管理制度《Computernetwork》MidtermExaminationName: Studentnumber: 100minChoice.1．The()isaworldwidecomputernetwork,thatis,anetworkthatinterconnectsmillionsofcomputingdevicesthroughouttheworld.AInternetB Intranet C switchnetD televisionnet2．Theunitsofdataexchangedbyalink-layerprotocolarecalled().A FramesBSegments C Datagrams D bitstreams3．()meansthattheswitchmustreceivetheentirepacketbeforeitcanbegintotransmitthefirstbitofthepacketontotheoutboundlink.A Store-and-forwardtransmission B FDMC End-to-endconnection D TDM4．Inthefollowingoptions,whichoneisnotaguided(有線)media

()

Atwisted-pairwireB fiberoptics CcoaxialcableDsatellite5．Delaydoesnotinclude().A ProcessdelayB propagationdelayC transmissiondelayDcontroldelay6.Inthefollowingoptions,whichbelongstothenetworkcore

()

A endsystemsB routers C clients D servers7．TheInternet’sconnection-orientedservicehasaname,itis().A TCPB UDP C TCP/IPD IP8．Therearetwofundamentalapproachestobuildinganetworkcore,()andpacketswitching.A electricalcurrentswitching B circuitswitchingC dataswitching D messageswitching9．A()protocolisusedtomoveadatagramoveranindividuallink.A application-layer B transport-layerC network-layer D link-layer10．Whichofthefollowingprotocolsisnotalink-layerprotocol?()A Ethernet B PPP C HDLC D IP11．ConsiderCRCerrorcheckingapproach,thefourbitgeneratorGis1011,andsupposethatthedataDis10101010,thenthevalueofRis().A 010B 100C011D 12．TheARPprotocolcantranslate()into().()A hostname,IPaddress B hostname,MACaddressC IPaddress,MACaddress D broadcastaddress,IPaddress13．InthefollowingdescriptionsaboutMACaddress,whichoneisnotcorrect?()A TheMACaddressistheaddressofonenode’sadapter.B NotwoadaptershavethesameMACaddress.C TheMACaddressdoesn’tchangenomatterwheretheadaptergoes.D MACaddresshasahierarchicalstructure.14．InCSMA/CD,theadapterwaitssometimeandthenreturnstosensingthechannel.Inthefollowingfourtimes,whichoneisimpossible?()A 0bittimesB 512bittimes C 1024bittimesD 1028bittimes15．ThemostcommonEthernettechnologiesare10BaseTand100BaseT.“10”and“100”indicate().A themaximumlengthbetweentwoadaptersB theminimumlengthbetweentwoadaptersC thetransmissionrateofthechannelD thetransmissionrateofthenode16．TheprincipalcomponentsofPPPincludebutnot().A framingB physical-controlprotocolC link-layerprotocolD network-layerprotocol17．Inthefollowingfouroptions,whichservicecannotbeprovidedbyswitch?()A filteringB self-learningC forwardingD optimalrouting18．In()transmission(s),thenodesatbothendsofalinkmaytransmitpacketsatthesametime.A full-duplex B half-duplexC single-duplex D bothfull-duplexandhalf-duplex20．MACaddressis()bitslong.A 32B 48C 128D 6421．Thefollowingprotocolsarebelongingtomultipleaccessprotocolsexceptfor().A channelpartitioningprotocols B routingprotocolsC randomaccessprotocols D taking-turnsprotocols22．Whichofthefollowingisnotbelongingtochannelpartitioningprotocols?()A CSMA B FDM C CDMA D TDM23．()providesamechanismfornodestotranslateIPaddressestolink-layeraddress.A IP B ARP C RARP D DNS24．AMACaddressisa()address.A physical-layer B application-layerC link-layer D network-layer35．Whichofthefollowingiscorrect

()A NotwoadaptershavethesameMACaddress.B MACbroadcastaddressisFF-FF-FF-FF-FF-FF.C AportablecomputerwithanEthernetcardalwayshasthesameMACaddress,nomatterwherethecomputergoes.D Alloftheabove36．IntheEthernetframestructure,theDatafieldcarriesthe().A IPdatagram B segment C frame D message37．Ethernet’smultipleaccessprotocolis().A CDMA B CSMA/CD C slottedALOHA D token-passingprotocol38．Aswitchisa()devicethatactsonframe.A physical-layer B link-layerC network-layer D transport-layer39．Whatarethetwomostimportantnetwork-layerfunctionsinadatagramnetwork

（）forwarding&routingforwarding&filteringrouting&detectingrouting&checking40．Arouterforwardsapacketbyexaminingthevalueofafieldinthearrivingpacket’sheader,andthenusingthisvaluetoindexintotherouter’sforwardingtable,thisvalueis

（）destinationIPaddresssourceIPaddressdestinationMACaddresssourceMACaddress41．Whichlayerprovideshost-to-hostservices?（）transportnetworkdatalinkphysical42．IPV4hasa___bitaddress（）4816326443．HowmanybitsspecifytheIPprotocolversioninadatagram?（）1bit2bits4bits8bits44．Data-gramsarerarelylargerthan____（）1500bytes65535bytes500bytes1024bytes45．HowdoestheTTLchangedbyoneeachtimethedatagramisprocessedbyarouter?（）decreaseincreasenochangealways046．ICMPisusedfor____

（）ReliabledatatransferErrorreportingFlowcontrolCongestioncontrol47．IPaddressingassignsanaddressto50/29,thenetworkaddressforthisnetworkis____.（）485048．Aswitchworksin____layer

（）NetworkingDatalinkApplicationPhysical49．Theinternet’snetworklayerprovidesasingleservice----thatis____.（）ReliabledatatransferFlowcontrolCongestioncontrolBest-effort-service50．Whichofthefollowingprotocolisusedforerrorreporting

（）ICMPTCPIPUDP51．Whichofthefollowingisnotaroutingprotocol

（）TCPRIPOSPFBGP52．IPaddressisidentifierfor____.（）HostRouterinterfaceBothofaboveNoneofabove53．“/24”,wherethe/24notation,sometimesknownasa____.（）SubnetmaskNetworkingaddressHostaddressNoneofabove54．IPV6hasa___bitsaddress

（）32641612855．Whichofthefollowingisnotintra-ASroutingprotocol?（）RIPOSPFIGRPBGP56．RIPisakindof____algorithm.（）DVLSBothofaboveNeitherofAandB57．OSPFisakindof____algorithm.（）DVLSBothofaboveNeitherofAandB58．Thetwoimportantnetwork-layerfunctionsare____.（）multiplexingandde-multiplexingroutingandforwardinglooku