天津理工大学-计算机网络题库.doc

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1、PARTⅠ:ChoiceB1.Whichofthefollowingservicesdoesnotthetransportlayerprovidefortheapplicationlayer?A.In-orderdeliveryofdatasegmentsbetweenprocessesB.BesteffortdeliveryofdatasegmentsbetweencommunicatinghostsC.MultiplexinganddemultiplexingoftransportlayersegmentsD.Congest

2、ioncontrolA2.WhatarethetwoofthemostimportantprotocolsintheInternet?A.TCPandIPB.TCPandUDPC.TCPandSMTPD.ARPandDNSC3.TheInternetprovidestwoservicestoitsdistributedapplications:aconnectionorientedreliableserviceanda().A.connectionorientedunreliableserviceB.connectionless

3、reliableserviceC.connectionlessunreliableserviceD.InorderdatatransportserviceD4.Processesontwodifferentendsystemscommunicatewitheachotherbyexchanging()acrossthecomputernetwork.A.packetsB.datagramC.framesD.messagesA5.Thejobofdeliveringthedatainatransport-layersegmentt

4、othecorrectsocketiscalled().A.demultiplexingB.multiplexingC.TDMD.FDMC6.TwoimportantreasonsthattheInternetisorganizedasahierarchyofnetworksforthepurposesofroutingare:A.LeastcostandmaximumfreecircuitavailabilityB.MessagecomplexityandspeedofconvergenceC.Scaleandadminist

5、rativeautonomyD.LinkcostchangesandlinkfailureB7.Whichofcharactersisnotdistance-vectoralgorithm’scharacters？（）A.iterativeB.globalC.asynchronousD.distributedD8.ThelengthofIPV6addressis（）bits.A.32B.48C.64D.128C9.ThehostcomponentofaCIDRaddressoftheforma.b.c.d/25cancontai

6、naddressesfor:A.225hosts(minus“special”hosts)B.512hosts(minus“special”hosts)C.2(32-25)hosts(minus“special”hosts)D.25hosts(minus“special”hosts)C10.Theprimaryfunctionoftheaddressresolutionprotocol(ARP)thatresidesinInternethostsandroutersis:A.ToprovideLANrouterfunctions

7、B.TotranslatebetweenLANaddressesandphysicalinterfaceaddressesC.TotranslateIPaddressestoLANaddressesA.TocalculatetheshortestpathbetweentwonodesonaLANA11.ThePOP3protocolrunsover____andusesport____.A.TCP110B.UDP110C.UDP25D.TCP25D12.Whenadestinationhosttransportlayerrece

8、ivesdatafromthenetworklayer,itunambiguouslyidentifiestheappropriateprocesstopassthedatatobyusingatripletconsistingof:A.Sourceport#,