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四川大学期末考试试题(A)(2006——2007学年第2学期)课程号:30306230课序号:06课程名称:计算机网络与通信任课教师:等成绩:适用专业年级:04学生人数:印题份数:学号:姓名:考试须知四川大学学生参加由学校组织或由学校承办的各级各类考试,必须严格执行《四川大学考试工作管理办法》和《四川大学考场规则》。有考试违纪作弊行为的,一律按照《四川大学学生考试违纪作弊处罚条例》进行处理。四川大学各级各类考试的监考人员,必须严格执行《四川大学考试工作管理办法》、《四川大学考场规则》和《四川大学监考人员职责》。有违反学校有关规定的,严格按照《四川大学教学事故认定及处理办法》进行处理。一、英译汉(10分)略1.PDA2.RFC3.IP4.CIDR5.URL6.CRC7.CSMA/CD8.ARQ9.RIP10.MSS二、单项选择题(每小题l分,共30分)1.DSLdividesthecommunicationlinkbetweenthehomeandtheISPintothreenonoverlappingfrequencybands,aupstreamchannelisin_A_________.A)50kHzto1MHzbandB)1MHzto2MHzbandC)4kHzto50kHzbandD)0to4kHzband2.Asadatapacketmovesfromtheuppertothelowerlayers,headersareA.A)Added;B)subtracted;C)rearranged;D)modified3.Whatisthemainfunctionofthenetworklayer?DA)node-to-nodedelivery;B)process-to-processmessagedeliveryC)synchronization;D)updatingandmaintenanceofroutingtables4.Whichofthefollowingisthedefaultmaskfortheaddress168.0.46.201?BA)255.0.0.0;B)255.255.0.0;C)255.255.255.0;D)255.255.255.2555.Arouterreadstheaddressonapackettodeterminethenexthop.AA)IP;B)MAC;C)source;D)ARP6.Whichdevicecan’tisolatesthedepartmentalcollisiondomains.AA)Hub;B)switch;C)router;D)AandB7.Inputportofarouterdon’tperform____D____functions.A)thephysicallayerfunctionsB)thedatalinklayerfunctionsC)lookupandforwardingfunctionD)networkmanagement8.HTTPhasamechanismthatallowsacachetoverifythatitsobjectsareuptodate.ThemechanismisDA)persistentconnectionsB)cookiesC)WebCachingD)conditionalGET9.Aprotocollayercanbeimplementedin___D_____.A)softwareB)hardwareC)acombinationofthesoftwareandhardwareD)Alloftheabove注:1试题字迹务必清晰,书写工整。本题4页,本页为第1页2题间不留空,一般应题卷分开教务处试题编号:3务必用A4纸打印10.Aprotocolhasthreeimportantfactors,theyare_A______.A)syntax,semantics,orderB)syntax,semantics,layerC)syntax,semantics,packetD)syntax,layer,packet11.Therearetwobroadclassesofpacket-switchednetworks:datagramnetworksandvirtual-circuitnetworks.Thevirtual-circuitnetworksforwardpacketsintheirswitchesuse___D___.A)MACaddressesB)IPaddressesC)e-mailaddressesD)virtual-circuitnumbers12.TCPservicemodeldoesn’tprovide___D_______service.A)reliabletransportserviceB)flowcontrolserviceC)congestion-controlserviceD)guaranteeaminimumtransmissionrateservice.13.Usuallyelasticapplicationsdon’tinclude____B______.A)ElectronicmailB)InternettelephonyC)filetransferD)Webtransfer14.AuserwhousesauseragentonhislocalPCreceiveshismailsitedinamailserverbyusing_B___protocol.A)SMTPB)POP3C)SNMPD)FTP15.Consideringsliding-windowprotocol,ifthesizeofthetransmittedwindowisNandthesizeofthereceivingwindowis1,theprotocolisBA)stop-and-waitprotocolB)Go-Back-NprotocolC)selectiveRepeatprotocolD)alternating-bitprotocol16.whichIPaddressiseffective___B______.A)202,131,45,61B)126.0.0.1C)192.268.0.2D)290.25.135.1217.ifIPaddressis202.130.191.33,subnetmaskis255.255.255.0,thensubnetprefixis__D_____A)202.130.0.0B)202.0.0.0C)202.130.191.33D)202.130.191.018.ThecommandPingsimplementedwith__B______messagesA)DNSB)ICMPC)IGMPD)RIP19.Whichlayer-functionismostlyimplementedinanadapter?__A________A)physicallayerandlinklayerB)networklayerandtransportlayerC)physicallayerandnetworklayerD)transportlayerandapplicationlayer20.IfauserbringshiscomputerfromChengdutoPeking,andaccessesInternetagain.Now,__B_____ofhiscomputerneedstobechanged.A)MACaddressB)IPaddressC)e-mailaddressD)useraddress三、填空题(每空1分,共22分(注意:所有填空题不能写中文,否则中文答案对的情况下扣0.5分)1.link-layeraddressisvariouslycalledaLANaddress,aMACaddress,oraphysicaladdress.2Inthelayeredarchitectureofcomputernetworking,nlayeristheuserofn-1layerandtheserviceproviderofn+1layer.A)nB)n+3C)n+1D)n-1注:1试题字迹务必清晰,书写工整。本题4页,本页为第2页2题间不留空,一般应题卷分开教务处试题编号:3务必用A4纸打印3.①SupposethatHostAhasestablishedaconnectiontoaprocessintheserver.Pleasefillinthesegmentscontainingdatathattheclientandserverhostscansendtoeachother.②Fromabovefigure,thewindowsizeofthesegmentsis216.4.Supposeausersittinginahomenetworkbehindhost10.0.0.1requestsaWebpageonsomeWebserver(port80)withIPaddress202.119.30.156,pleaseaccordingtheNATtranslationtableattheNATrouter,fillindatagramthatincludeportnumbersaswellasIPaddresses.(有IP缺端口号一个扣0.5分)5.Summaryofreliabledatatransfermechanismsandtheiruse,asshowbelow.Pleasefillintransfermechanisms.MechanismUseChecksumUsedtodetectbiterrorsinatransmittedpacket.SequencenumberUsedforsequentialnumberingofpacketsofdataflowingfromsendertoreceiver.Acknowledgment(或ACK)Usedbythereceivertotellthesenderthatapacketorsetofpacketshasbeenreceivedcorrectly.CountdowntimerUsedtotimeout/retransmitapacket,possiblybecausethepacket(oritsACK)waslost.Window,pipelinlingThesendermayberestrictedtosendingonlypacketswithsequencenumbersthatfallwithinagivenrange.Sourceport=13Destport=21Sequencenumber=1235Acknowledgmentnumber=67905SYN=0ACKReceivewindowChecksumNIL1000bytesdataNATtranstationtableWANsideLANside139.78.30.10,5001……10.0.0.1,1024……Sourceport=21Destport=13Sequencenumber=6790Acknowledgmentnumber=22355SYN=0ACKReceivewindowChecksumNIL1000bytesdataABprocessingIfHostAHostBThenHostAHostB③Sourceaddr=10.0.0.1,1024Destaddr=202.119.30.156,80①S=139.78.30.10,5001Dddr=202.119.30.156,80Saddr=202.119.30.156,80Daddr=139.78.30.10,5001139.78
本文标题:四川大学计算机网络与通信期末考试-2007A
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