天津理工大学 计算机网络题库

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

2、segmentsD.CongestioncontrolA2.WhatarethetwoofthemostimportantprotocolsintheInternet?A.TCPandIPB.TCPandUDPC.TCPandSMTPD.ARPandDNSC3.TheInternetprovidestwoservicestoitsdistributedapplications:aconnectionorientedreliableserviceanda().A.connectionoriente

3、dunreliableserviceB.connectionlessreliableserviceC.connectionlessunreliableserviceD.InorderdatatransportserviceD4.Processesontwodifferentendsystemscommunicatewitheachotherbyexchanging()acrossthecomputernetwork.A.packetsB.datagramC.framesD.messagesA5.

4、Thejobofdeliveringthedatainatransport-layersegmenttothecorrectsocketiscalled().A.demultiplexingB.multiplexingC.TDMD.FDMC6.TwoimportantreasonsthattheInternetisorganizedasahierarchyofnetworksforthepurposesofroutingare:A.Leastcostandmaximumfreecircuitav

5、ailabilityB.MessagecomplexityandspeedofconvergenceC.ScaleandadministrativeautonomyD.LinkcostchangesandlinkfailureB7.Whichofcharactersisnotdistance-vectoralgorithm’scharacters？（）A.iterativeB.globalC.asynchronousD.distributedD8.ThelengthofIPV6addressis

6、（）bits.A.32B.48C.64D.128C9.ThehostcomponentofaCIDRaddressoftheforma.b.c.d/25cancontainaddressesfor:A.225hosts(minus“special”hosts)B.512hosts(minus“special”hosts)C.2(32-25)hosts(minus“special”hosts)D.25hosts(minus“special”hosts)C10.Theprimaryfunctiono

7、ftheaddressresolutionprotocol(ARP)thatresidesinInternethostsandroutersis:A.ToprovideLANrouterfunctionsB.TotranslatebetweenLANaddressesandphysicalinterfaceaddressesC.TotranslateIPaddressestoLANaddressesA.TocalculatetheshortestpathbetweentwonodesonaLAN

8、A11.ThePOP3protocolrunsover____andusesport____.A.TCP110B.UDP110C.UDP25D.TCP25D12.Whenadestinationhosttransportlayerreceivesdatafromthenetworklayer,itunambiguouslyidentifiestheappropriateprocesstopassthedatatobyusingatripletconsistingof:A.Sourceport#,