MOOC Introduction of Information Communication Network-东南大学 中国大学慕课答案

MOOCIntroductionofInformationCommunicationNetwork-东南大学中国大学慕课答案Test1、问题：Whichofthefollowingdescriptionsofnetworkclassificationiswrong选项：A、Anetworkconnectingdigitalterminaldevicessuchascomputerswithin10moftheuser'scomputerisaWSNB、Anetworkcovering10m~10kmisaLANC、Anetworkcovering10~100kmisMAND、Anetworkscovering100~1000kmbecomeWANs正确答案:【Anetworkconnectingdigitalterminaldevicessuchascomputerswithin10moftheuser'scomputerisaWSN】2、问题：WhichofthefollowingdescriptionsofWANcharacteristicsiswrong选项：A、WANisapublicdatanetworkB、WANprovidetelecommunication-levelservicestousersC、WANresearchfocusesonbroadbandcoreswitchingtechnologiesD、ThecoretechnologyofWANislineswitchingtechnology正确答案:【ThecoretechnologyofWANislineswitchingtechnology】3、问题：Thecomputernetworkiscomposedofnetworkhardwaresystemandnetworksoftwaresystem.选项：A、正确B、错误正确答案:【正确】4、问题：Ingeneral,networknodeshaveduality,whichcanbeusedasbothaccessnodesandtransfernodes.选项：A、正确B、错误正确答案:【正确】Test1、问题：Amongfollowingdescriptionsofthedatagramtransmissionmode,whichiswrong?选项：A、DifferentpacketsofthesamemessagecanpassthroughthecommunicationsubnetworkthroughdifferenttransmissionpathsB、Whendifferentpacketsofthesamemessagearriveatthedestinationhost,theymaybeout-of-order,duplicatedorlostC、EachpacketmustcarryadestinationaddressandasourceaddressduringtransmissionD、Datagrammodeissuitableforlongmessageandsessioncommunication正确答案:【Datagrammodeissuitableforlongmessageandsessioncommunication】2、问题：Messageexchangeadoptsstore-and-forwardmechanism.选项：A、正确B、错误正确答案:【正确】3、问题：Atpresent,packetswitchingisthemostcommonlyusedswitchingmodeincommunicationnetworks.选项：A、正确B、错误正确答案:【正确】4、问题：Thedelayofmessageexchangeisveryshort,soitisstillthemainexchangemode.选项：A、正确B、错误正确答案:【错误】5、问题：Circuitswitchingisdividedintothreestages:establishingconnection,communicatingandreleasingconnection.选项：A、正确B、错误正确答案:【正确】Test1、问题：WhichiswrongamongthefollowingdescriptionsoftheOSIenvironment选项：A、7layersfromtheapplicationlayertothephysicallayerofthehostshownbythedottedlineoftheOSIenvironmentandthecommunicationsubnetB、ThephysicaltransmissionmediumconnectingthehostisincludedintheOSIenvironmentC、Ifahostisnotconnectedtothecomputenetwork,itmaynotneedhardwareandsoftwaretorealizefunctionsfromthephysicallayertotheapplicationlayerD、TheprocessesofthehostarecontrolledbythelocaloperatingsystemanddonotbelongtotheOSIenvironment正确答案:【ThephysicaltransmissionmediumconnectingthehostisincludedintheOSIenvironment】2、问题：AmongthefollowingdescriptionsofthedatatransmissionprocessinOSIenvironment,thewrongdescriptionis选项：A、ThedatageneratedbytheapplicationprocessofsourcehostistransmittedverticallyandlayerbylayerfromtheapplicationlayerB、ThepresentationlayeronlyexchangesdataformatswithoutaddingprotocolheadersC、Thetargethostreadstheheaderlayerbylayeraccordingtotheprotocolofeachlayer,andexecutestheactionspecifiedbytheprotocolD、Doesnotneeduserinterventioninthewholeprocess正确答案:【Thepresentationlayeronlyexchangesdataformatswithoutaddingprotocolheaders】3、问题：IntheOSIreferencemodel,thefirstleveltoprovideend-to-endservicesfrombottomtotopis选项：A、PhysicallayerB、DataLinkLayerC、NetworklayerD、Transportlayer正确答案:【Transportlayer】4、问题：Amongthefollowingcomponents,whichdoesnotbelongtothenetworkarchitecture选项：A、NetworkhierarchyB、ProtocolsusedateachlayerC、ProtocoldetailsD、Functionsimplementedateachlayer正确答案:【Protocoldetails】5、问题：ThenetworklayerprotocolinTCP/IPsystemprovides选项：A、ConnectionlessandunreliablepacketserviceB、ConnectionlessandreliablepacketserviceC、VirtualcircuitserviceswithunreliableconnectionsD、Virtualcircuitservicewithreliableconnection正确答案:【Connectionlessandunreliablepacketservice】HomeworkUnittest1、问题：Whichiswrongamongthefollowingdescriptionsofnetworkprotocolsandprotocolelements?选项：A、ProtocolpresentsnetworkfunctionsB、SemanticiswhattodoC、GrammarmeanshowtodoitD、Timesequenceindicatestheorderofprocess正确答案:【Protocolpresentsnetworkfunctions】2、问题：Whichiswrongamongthefollowingdescriptionsoftheconceptofnetworkarchitecture选项：A、NetworkarchitectureisacollectionofnetworkhierarchymodelandprotocolsateachlayerB、AllcomputernetworksshouldfollowOSIarchitecture.C、Thenetworkarchitectureisabstract,andthetechnologytorealizethenetworkprotocolisconcreteD、Thenetworkarchitectureaccuratelydefinesthefunctionsthatthecomputernetworkshouldrealize正确答案:【AllcomputernetworksshouldfollowOSIarchitecture.】3、问题：Whichiswrongamongthefollowingadvantagesoftheresearchmethodofnetworkarchitecture选项：A、EachlayerisindependentwitheachotherB、EasytoimplementandstandardizeC、AllowingforinterlayercommunicationisasignofflexibilityofOSIreferencemodelD、Changesinimplementationtechnologywillnotaffecttheworkofthewholesystem正确答案:【AllowingforinterlayercommunicationisasignofflexibilityofOSIreferencemodel】4、问题：WhichiswrongamongthefollowingdescriptionofthebasicconceptsofOSIreferencemodel选项：A、Term‘Open’inOSIReferenceModelreferstobeingabletobeusedforanykindofoperatingsystemforcomputerB、TheOSIreferencemodeldefinesthehierarchyofopensystemsandtheinterrelationshipsbetweenthehierarchiesC、TheservicedefinitionofOSIexplainstheservicesprovidedbyeachlayerindetail,anddoesnotinvolvethespecificimplementationmethodofinterfacesD、OSIreferencemodelisnotastandard,butaconceptualframeworkusedinformulatingstandards正确答案:【Term‘Open’inOSIReferenceModelreferstobeingabletobeusedforanykindofoperatingsystemforcomputer】5、问题：Whichiswrongamongthefollowingdescriptionsofthe7-leveldivisionprincipleofOSIreferencemodel选项：A、EachhostinthenetworkcanhavedifferentlevelsB、ThesamelayerofdifferenthostshasthesamefunctionC、AdjacentlayersinthesamehostcommunicatethroughtheinterfaceD、Thesamelayerofdifferenthostsrealizesthecommunicationbetweenthesamelayersthroughtheprotocol正确答案:【Eachhostinthenetworkcanhavedifferentlevels】6、问题：Whichiswrongamongthefollowingdescriptionsofbasicfeaturesofthephysicallayer选项：A、BottomlayeroftheOSIreferencemodelB、Establishing,managingandreleasingphysicalconnectionsbetweencommunicatinghostsC、RealizingtransparenttransmissionofthebitstreamD、Datatransmissionunitisabyte正确答案:【Datatransmissionunitisabyte】7、问题：Amongthefollowingbasicfeatures(orproperties)ofthedatalinklayer,whichisthewrongdescription选项：A、AdjacenthighlayeristhenetworklayerB、DatalinkcanbeestablishedafterthephysicalconnectionisreleasedC、AdoptingthemethodoferrorcontrolandflowcontroltomakethephysicallinewitherrorsbecomethephysicallinkwithouterrorsD、Thedatatransmissionunitofthedatalinklayerisaframe正确答案:【Datalinkcanbeestablishedafterthephysicalconnectionisreleased】8、问题：Amongthefollowingbasicfeaturesofthenetworklayer,whichisthewrongdescription选项：A、AdjacenthighlayeristhetransportlayB、SelectinganappropriatetransmissionlinkforthepacketthroughthecommunicationsubnetworkbyroutingselectionalgorithmC、Realizingthefunctionsofflowcontrol,congestioncontrolandnetworksecurityD、Thedatatransmissionunitofthenetworklayerisapacket正确答案:【Realizingthefunctionsofflowcontrol,congestioncontrolandnetworksecurity】9、问题：Amongthefollowingbasicfeaturesofthetransportlayer,whichisthewrongdescription选项：A、AdjacentlowerlayeristhenetworklayerB、AdjacenthighlayeristhepresentationlayerC、Providingreliableend-to-endconnectionanddatatransmissionservicesforcomputeprocessesdistributedindifferentgeographicallocationsD、Shieldingdetailsoflow-leveldatacommunicationtothehighlevel正确答案:【Adjacenthighlayeristhepresentationlayer】10、问题：WhichiswrongamongthefollowingdescriptionsofOSIenvironment选项：A、7layersfromtheapplicationlayertothephysicallayerofthehostshownbythedottedlineoftheOSIenvironmentandthecommunicationsubnetB、ThephysicaltransmissionmediumconnectingthehostisincludedintheOSIenvironmentC、Ifahostisnotconnectedtothecomputenetwork,itmaynotneedhardwareandsoftwaretorealizefunctionsfromthephysicallayertotheapplicationlayerD、TheprocessesofthehostarecontrolledbythelocaloperatingsystemanddonotbelongtotheOSIenvironment正确答案:【ThephysicaltransmissionmediumconnectingthehostisincludedintheOSIenvironment】11、问题：AmongthefollowingdescriptionsofthedatatransmissionprocessinOSIenvironment,thewrongdescriptionis选项：A、ThedatageneratedbytheapplicationprocessofsourcehostistransmittedverticallyandlayerbylayerfromtheapplicationlayerB、ThepresentationlayeronlyexchangesdataformatswithoutaddingprotocolheadersC、Thetargethostreadstheheaderlayerbylayeraccordingtotheprotocolofeachlayer,andexecutestheactionspecifiedbytheprotocolD、Doesnotneeduserinterventioninthewholeprocess正确答案:【Thepresentationlayeronlyexchangesdataformatswithoutaddingprotocolheaders】12、问题：Amongthefollowingcharacteristicsofthetransportlayer,whichiswrong选项：A、Realizingdistributedprocess-communicationinnetworkenvironmentB、TCPisareliable,connection-oriented,byte-stream-orientedtransportlayerprotocolC、Anunreliable,connectionlesstransportlayerprotocolforUDPD、Dataunitofprotocolisapacket正确答案:【Dataunitofprotocolisapacket】13、问题：Whatiscorrectindescribingtherelationshipbetweenthenthlayerandthen+1layerinOSIreferencemodel选项：A、Thenthlayerprovidesservicesforthen+1thlayerB、Then+1layeraddsaheadertothemessagereceivedfromthenthlayerC、Then-layerheaderisusedtocoordinateprotocolactionsbetweenthen-layersofadjacentnodesD、Thenthlayandthen+1thlayerhavenoinfluenceoneachother正确答案:【Thenthlayerprovidesservicesforthen+1thlayer】14、问题：InOSIreferencemodel,thefirstleveltoprovideend-to-endservicesfrombottomtotopis选项：A、PhysicallayerB、DataLinkLayerC、NetworklayerD、Transportlayer正确答案:【Transportlayer】15、问题：Amongthefollowingcomponents,whichdoesnotbelongtonetworkarchitecture选项：A、NetworkhierarchyB、ProtocolsusedateachlayerC、AgreementdetailsD、Functionsimplementedateachlayer正确答案:【Agreementdetails】16、问题：ThenetworklayerprotocolinTCP/IPsystemprovides选项：A、ConnectionlessandunreliablepacketserviceB、ConnectionlessandreliablepacketserviceC、VirtualcircuitserviceswithunreliableconnectionsD、Virtualcircuitservicewithreliableconnection正确答案:【Connectionlessandunreliablepacketservice】17、问题：Theresourcessharedbythecomputernetworkare选项：A、RouterandswitchB、Domainname,networkaddressandMCAaddressC、ComputerfilesanddataD、Computersoftware,hardwareanddata正确答案:【Computersoftware,hardwareanddata】18、问题：Whichofthefollowingdescriptionsofnetworkclassificationiswrong选项：A、Anetworkconnectingdigitalterminaldevicessuchascomputerswithin10moftheuser'scomputerisaWSNB、Anetworkcovering10mto10kmisaLANC、Anetworkcovering10~100kmisaMAND、Anetworkcovering100~1000kmisaWAN正确答案:【Anetworkconnectingdigitalterminaldevicessuchascomputerswithin10moftheuser'scomputerisaWSN】19、问题：WhichofthefollowingdescriptionsofWANcharacteristicsiswrong选项：A、WANisapublicdatanetworkB、WANshallprovidetelecommunication-levelservicesforusersC、ThefocusofWANresearchisbroadbandcoreswitchingtechnologyD、ThecoretechnologyofWANislineswitchingtechnology正确答案:【ThecoretechnologyofWANislineswitchingtechnology】20、问题：Amongthefollowingdescriptionsofbroadbandmetropolitanareanetwork,thewrongdescriptionis选项：A、OpticalfibertransmissionnetworkisthefoundationofbroadbandmetropolitanareanetworkB、Theintegrationoftraditionaltelecommunication,cableTVandIPserviceshasbecomethecoreserviceofbroadbandmetropolitanareanetworkC、SwitchesinLayer2isthecoreequipmentofbroadbandmetropolitanareanetworkD、Expandingthescaleandservicequalityofbroadbandaccessisthekeytodevelopingtheapplicationofbroadbandmetropolitanareanetwork正确答案:【SwitchesinLayer2isthecoreequipmentofbroadbandmetropolitanareanetwork】21、问题：Thecomputernetworkiscomposedofnetworkhardwaresystemandnetworksoftwaresystem.选项：A、正确B、错误正确答案:【正确】22、问题：Thehostcomputerbelongstotheswitchingnodeofthenetworknodeinthecomputernetwork.选项：A、正确B、错误正确答案:【错误】23、问题：Ingeneral,networknodeshaveduality,andcanbeusedasbothaccessnodesandtransfernodes.选项：A、正确B、错误正确答案:【正确】24、问题：Physicallinksdonothavethecapabilityofdatatransmissioncontrol.选项：A、正确B、错误正确答案:【正确】25、问题：Commontransmissionmediaincomputernetworksincludetwistedpair,coaxialcableandopticalfiber.选项：A、正确B、错误正确答案:【正确】Test1、问题：Amongthefollowingfourtransmissionmedia，whichhasthewidestbandwidth,thesmallestsignaltransmissionattenuationandthestrongestanti-interferencecapability?选项：A、TwistedpairB、CoaxialcableC、OpticalfiberD、Microwave正确答案:【Opticalfiber】2、问题：Whatarethebenefitsofshieldingincables?选项：A、ReducesignalattenuationB、ReduceelectromagneticinterferenceradiationC、ReducephysicallossD、Reducecableimpedance正确答案:【Reduceelectromagneticinterferenceradiation】3、问题：Physicallayeristhespecificphysicaldeviceorspecifictransmissionmediumconnectingthecomputers.选项：A、正确B、错误正确答案:【错误】4、问题：Incomputernetworks,carriersusedtotransmitinformationsuchastwistedpair,coaxialcableandopticalfiberarecalledtransmissionmedia.选项：A、正确B、错误正确答案:【正确】5、问题：Adatatransmissionmodethatallowssignalstobetransmittedintwodirectionsbutcanonlybetransmittedinonedirectionateachmomentiscalledsimplexcommunication.选项：A、正确B、错误正确答案:【错误】Test1、问题：Thebasisofanalogsignaltransmissioniscarrierwave.Whichisnotthe3elementsofcarrierwave?选项：A、AmplitudeB、FrequencyC、PeriodD、Phase正确答案:【Period】2、问题：ThefollowingfigureshowsManchestercoding.Whatisthebinarydatashowninthisfigure?选项：A、01011B、01101C、10100D、01100正确答案:【01011】3、问题：Inordertoincreasethetransmissiondistanceoftheanalogtransmissionsystem,whatequipmentshouldbeused?选项：A、BridgeB、AmplifierC、RouterD、Switch正确答案:【Amplifier】4、问题：Analogcommunicationsystemusuallyconsistsofsource,modulator,channel,demodulatorandsink.Theelectricalsignalbeforemodulationiscalledanalogsignal,andthemodulatedsignaliscalleddigitalsignal.选项：A、正确B、错误正确答案:【错误】5、问题：Inanalogdatacommunicationsystem,digitaldatacanbemodulatedaccordingtodifferentelementsofcarrierwave.Therearethreemethodsofmodulatingsignals,namelyamplitudekeying,frequencyshiftkeyingandphaseshiftkeying.选项：A、正确B、错误正确答案:【正确】Test1、问题：Whichiswrongamongthefollowingdescriptionsoftheconceptoftimedivisionmultiplexing?选项：A、TimedivisionmultiplexingdividesthetimeusedbythelineintoapluralityoftimeslicesB、TimedivisionmultiplexingisdividedintosynchronoustimedivisionmultiplexingandstatisticaltimedivisionmultiplexingC、StatistictimedivisionmultiplexingassigntimeslicestoeachchannelinadvanceD、Theconceptsofframeusedintimedivisionmultiplexingandtheframeindatalinklayerfunctiondifferently正确答案:【Statistictimedivisionmultiplexingassigntimeslicestoeachchannelinadvance】2、问题：Whichiswrongamongthefollowingdescriptionsofthetechnicalcharacteristicsofstatisticaltimedivisionmultiplexing?选项：A、TheEnglishabbreviationofstatisticaltimedivisionmultiplexingisATDMB、StatistictimedivisionmultiplexingallowsdynamicallocationoftimeslicesC、ThedatasentoutbystatisticaltimedivisionmultiplexingdoesnotneedtohaveaddressesofbothreceivingandreceivingpartiesD、Themultiplexingdevicemayalsoadoptthestore-and-forwardmodetoadjustthetransmissionrateofthecommunicationline正确答案:【TheEnglishabbreviationofstatisticaltimedivisionmultiplexingisATDM】3、问题：Multiplexingtechnologycanbedividedintothreebasicmodes:frequencydivisionmultiplexing,wavelengthdivisionmultiplexingandtimedivisionmultiplexing.选项：A、正确B、错误正确答案:【正确】4、问题：Theprocessofpulsecodingmodulationcanbesimplydividedintotwoprocesses:samplingandcoding.选项：A、正确B、错误正确答案:【错误】5、问题：Incellularmobilecommunicationsystems,therearethreecommonlyusedmultipleaccesstechnologies:frequencydivisionmultipleaccess,timedivisionmultipleaccessandcodedivisionmultipleaccess.选项：A、正确B、错误正确答案:【正确】Test1、问题：InATMtechnology,cellsarethebasicunitofdatatransmission,andtheirlengthis:选项：A、43BB、5BC、48BD、53B正确答案:【53B】2、问题：Whichisincorrectamongthefollowingdescriptionsofpacketswitching?选项：A、ThedatagrammodeisflexibleandfastB、Therearetwomodeofpacketexchange:datagrammodeandvirtualcircuitmodeC、ThepacketswitchingtechnologyhashigherrorrateofdatatransmissionandlowlineutilizationrateD、Thevirtualcircuitmodecanestablishseverallogicalvirtualcircuitsononephysicalcircuit,makingusersfeelasifthereareseveralphysicallinks正确答案:【Thepacketswitchingtechnologyhashigherrorrateofdatatransmissionandlowlineutilizationrate】3、问题：WhatisthemeaningofasynchronousinAsynchronousTransferMode(ATM)technology?选项：A、AdoptsasynchronousserialcommunicationtechnologyB、AdoptsasynchronouscontrolmodeC、PeriodicallyinsertsintoATMcellsD、InsertsintoATMcellsatanytime正确答案:【InsertsintoATMcellsatanytime】4、问题：WhichiswrongamongthefollowingdescriptionsofT1carrier?选项：A、T1carrierratesaredesignedfortimedivisionmultiplexingofpulsecodemodulationPCMB、T1systemmultiplexed24channelsofdigitalvoicechannelsononecommunicationlineC、PCMencoderalternatelyinserts24channelsof8bitdigitalvoicesignalsintothedesignatedpositionintheframeD、ThedatatransmissionrateofT1carrieris2.048Mbps正确答案:【ThedatatransmissionrateofT1carrieris2.048Mbps】5、问题：WhichiswrongamongthefollowingdescriptionsofthecomparisonbetweenADSLandHFC?选项：A、ADSLbackboneusesopticalfiberandHFCbackboneusesbroadbandcoaxialcableB、ADSL’suser-accessusestelephoneline,HFC’suser-accessusesCATVcableC、ThetelephonelineconnectedtotheADSLmodemisdedicatedtotheuser,andtheCATVcableconnectedtoHFCuserissharedD、ADSLoperatorscanmakeacommitmenttosubscribers'broadband,whereasHFCoperatorsgenerallydonotmakeanexplicitcommitment正确答案:【ADSLbackboneusesopticalfiberandHFCbackboneusesbroadbandcoaxialcable】HomeworkUnittest1、问题：Amongthefollowingdescriptionsofthephysicallayer,whichiswrong?选项：A、ThemaintaskofthephysicallayeristoensurethecorrecttransmissionofthebitstreamthroughthetransmissionmediumB、Thetransmissionmediaconnectingphysicallayermayhavedifferenttypes,suchasopticalfiberandwirelesscommunicationlines,etc.C、Protocolsofphysicallayercanbedivideintotwotypes:point-to-pointcommunicationlinesandbroadcast-basedlinesD、PhysicallayershieldsthedifferencebetweenEthernetandIP正确答案:【PhysicallayershieldsthedifferencebetweenEthernetandIP】2、问题：Amongthefollowingdescriptionsofdatatransmissionrate,whichiswrong?选项：A、DatatransmissionraterepresentsthenumberoftransmittedbinarybitspersecondB、Forbinarydata,thatdatatransmissionrateisS=1/T(bps)C、Commondatatransmissionrateunitsare:1Mbps=1.024×10^6bpsD、Datatransmissionrateisoneoftheimportanttechnicalindexestodescribetheperformanceofdatatransmissionsystem正确答案:【Commondatatransmissionrateunitsare:1Mbps=1.024×10^6bps】3、问题：WhichiswrongamongthefollowingdescriptionsofNyquist'scriteria?选项：A、UsedtocalculatebandwidthandrateinthestateofrandomnoiseB、UseacalculationmodelofnarrowpulsesignalpassingthroughanidealcommunicationchannelC、Maximumtransmissionrateofthelineisnumericallyequalto2timesofthechannelbandwidthD、Theunitoftransmissionrateisbps正确答案:【Usedtocalculatebandwidthandrateinthestateofrandomnoise】4、问题：IfthefollowingisaManchesterencodedwaveformof8-bitdata,whatisthisdata?选项：A、10110100B、01001011C、11010010D、01011100正确答案:【01001011】5、问题：Whichiswrongamongthefollowingstatementsaboutsatellitecommunication?选项：A、Satellitecommunicationhasalargecommunicationdistanceandawidecoveragerange.B、Itiseasytorealizebroadcastcommunicationandmultipleaccesscommunicationbyusingsatellitecommunication.C、Theadvantagesofsatellitecommunicationarethatitisnotaffectedbyclimateanditsbiterrorrateisverylow.D、Highcommunicationcostandlargedelayaretheshortcomingsofsatellitecommunication.正确答案:【Theadvantagesofsatellitecommunicationarethatitisnotaffectedbyclimateanditsbiterrorrateisverylow.】6、问题：WhenFSKmodulationisperformedonasignal,andifthecarrierfrequencyisfcandtheoriginal/modulatedsignalfrequenciesaref1andf2respectively(f1f2),whatistherelationshipbetweenthethree?选项：A、fc-f1=f2-fcB、f2-f1=fcC、f2+f1=fcD、f1·f2=fc正确答案:【fc-f1=f2-fc】7、问题：Whichisthemodulationanddemodulationtechnologymainlyusedamongthefollowingcommunicationmodes?选项：A、AnalogchanneltransmitsdigitaldataB、AnalogchanneltransmitanalogdataC、DigitalchanneltransmitdigitaldataD、Digitalchanneltransmitanalogdata正确答案:【Analogchanneltransmitsdigitaldata】8、问题：Whatisthechannelcommunicationmodeinwhichbothcommunicationpartiescantransmitdatasimultaneouslyatthesametime?选项：A、HalfduplexcommunicationB、SimplexcommunicationC、DatagramD、Fullduplexcommunication正确答案:【Fullduplexcommunication】9、问题：Generallyspeaking,forhigh-speedlocalareanetworkswithlargevolume,whichshouldbeselectedinordertoobtainhigherperformanceamongfollowingmedia?选项：A、CoaxialcableB、OpticalFiberC、TwistedpairD、Wireless正确答案:【OpticalFiber】10、问题：Whatarethethreebasicformsofanalogdatacoding?选项：A、BSK,PSK,LSKB、ASK,FSK,PSKC、AKS,FKS,PKSD、BKS,PKS,FKS正确答案:【ASK,FSK,PSK】11、问题：Whenadigitalsignalistransmittedinananalogtransmissionsystem,whatarerequiredatthetransmittingandthereceivingendsrespectively?选项：A、ModulatorandDemodulatorB、DemodulatorandModulatorC、EncoderanddecoderD、Decoderandencoder正确答案:【ModulatorandDemodulator】12、问题：Dividingthefrequencybandwidthofthephysicalchannelintoseveralsubchannels,eachsubchanneltransmittingonesignal.Whatisthismultiplexingtechnologycalled?选项：A、SynchronoustimedivisionmultiplexingB、SpacedivisionmultiplexC、AsynchronoustimedivisionmultiplexD、Frequencydivisionmultiplex正确答案:【Frequencydivisionmultiplex】13、问题：Duringdatatransmission,localtelephonenetworkhasaphysicalconnectionlinebetweenthesourcenodeandthedestinationnode,whichconstituteintermediatenodes.Whatisthetechnologyadoptedbythislocaltelephonenetworkcalled?选项：A、MessageExchangeB、LineSwitchingC、VCPswitchD、Datagrampacketexchange正确答案:【LineSwitching】14、问题：Whichoneamongthefollowingmultiplexingtechnologieshasthefunctionofdynamicallyallocatingtimeslots?选项：A、SynchronoustimedivisionmultiplexingB、StatisticaltimedivisionmultiplexC、FrequencydivisionmultiplexD、Wavelengthdivisionmultiplexing正确答案:【Statisticaltimedivisionmultiplex】15、问题：Indigitalcommunication,whatisthetechnologytokeepthetimereferencebetweenthetransceiverandthetransceiverconsistent?选项：A、SwitchingTechnologyB、SynchronizationTechnologyC、CodingTechnologyD、TransmissionTechnology正确答案:【SynchronizationTechnology】16、问题：Whatisthecodingmethodwhichrepresentsthedigitalsignal1,0bychangingthephasevalueofthecarriersignal?选项：A、ASKB、FSKC、PSKD、NRZ正确答案:【PSK】17、问题：Shannon'stheoremdescribestherelationshipbetweenbandwidthandratefromaquantitativepointofview.IntheformulaofShannon'stheorem,theparametersrelatedtothemaximumtransmissionrateofthechannelmainlyincludeschannelbandwidthand()?选项：A、FrequencycharacteristicsB、Signal-to-NoiseRatioC、PhaseCharacteristicsD、NoisePower正确答案:【Signal-to-NoiseRatio】18、问题：Thepacketswitchingmodeistodividealongmessageintoseveralshorterpacketswithafixedmaximumlength.Differentfrompacketswitching,packetswitchinghas()?选项：A、MessageHeaderB、EndofmessageC、RoutingD、GroupNumber正确答案:【GroupNumber】19、问题：Generallyspeaking,digitaltransmissioncangethighersignalqualitythananalogtransmission,because?选项：A、Therepeatercanregeneratedigitalpulsestoremovesignaldistortion,andtheamplifieramplifiestheanalogsignalaswellastheanalogsignaldistortedB、DigitalsignalsaresmallerthananalogsignalsandarenotpronetodistortionC、AnalogsignalsarecontinuousandarenotpronetodistortionD、Digitalsignaliseasiertosamplethananalogsignal正确答案:【Therepeatercanregeneratedigitalpulsestoremovesignaldistortion,andtheamplifieramplifiestheanalogsignalaswellastheanalogsignaldistorted】20、问题：Amongthefollowingdataexchangemodes,thetransmissiondelayofdatathroughthenetworkislongandunstable.Whichcannotbeusedforvoicedatatransmission?选项：A、LineSwitchingB、MessageexchangeC、VCPswitchD、Datagrampacketexchange正确答案:【Messageexchange】21、问题：Datatransferrateisthenumberofbytestransferredpersecond.选项：A、正确B、错误正确答案:【错误】22、问题：Modemisonlyusedtoconvertdigitalsignalsintoanalogsignalsandtransmitthemontheline.选项：A、正确B、错误正确答案:【错误】23、问题：ManchestercodeanddifferentialManchestercodebelongtoself-containedclockcode.选项：A、正确B、错误正确答案:【正确】24、问题：Bitratedescribesthenumberofbinarybitsthatmakeupthecodetransmittedpersecondincomputercommunication.选项：A、正确B、错误正确答案:【正确】25、问题：Datasentbystatisticaltimedivisionmultiplexingneedtohaveaddressesofbothtransceiverandtransceiver.选项：A、正确B、错误正确答案:【错误】Tests1、问题：Whatdoesnotbelongtothethreepossibleservicesthatareprovidedbydatalinklayer?选项：A、ConnectionlessservicewithoutacknowledgementB、ConnectionlessservicewithconfirmationC、Connection-orientedservicewithoutacknowledgementD、Confirmedconnection-orientedservice正确答案:【Connection-orientedservicewithoutacknowledgement】2、问题：Thedatalinklayerencapsulatesthepacketsobtainedfromthenetworklayerintoframesfortransmission,eachframecontainingaframeheaderandapayloaddomain.选项：A、正确B、错误正确答案:【错误】3、问题：Inbytefilling,iftheescapedbyteappearsinthemiddleofthedata,thereisnoneedtoinserttheescapedbyte