四川大学计算机网络与通信期末考试07-08A

四川大学期末考试试题（A）闭卷（2007——2008学年第2学期）课程号：30306230课序号：07课程名称：计算机网络与通信任课教师：成绩：适用专业年级：05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。第一题第二题第三题第四题第五题总分一、英译汉（10分）1.ISP2.RFC3.SMTP（简单邮件传输协议）4.API(应用程序接口)5.RTT：往返传输时间6.MSS：最大数据段尺寸7.CIDR(无类域间路由)8.RIP(路由信息协议)9.CSMA/CD10.ARP二、单项选择题（每小题l.5分，共30分)1．WhichapplicationusesUDPprotocol?CA.TelnetB.SMTPC.InternetphoneD.FTP2．WhichphysicalmediabelongstounguidedmediaAA.satellitechannelB.twisted-pairwireC.coaxialcableD.fiber-opticcable3．Whichisnotthefunctionofconnection-orientedservice?CA.flowcontrolB.congestioncontrolC.errorcorrectionD.reliabledatatransfer4．Whichtechnologyusesvirtualcircuits?BA.EthernetB.ATMC.FTPD.HTTP5．Asadatapacketmovesfromthelowertotheupperlayers,headersare.(B)A.Added;B.subtracted;C.rearranged;D.modified6．WhatmustPConthenetworkhaveincommoninordertodirectlycommunicateeachother?(C)A.usethesameoperatingsystemB.usethesamehardwareC.usethesameprotocolD.builtbysamecompany7．Whatisusedtospecifyplacementoftext,filesandobjectsthataretobetransferredfromthewebservertotheclient?(B).A.HTTPB.HTMLC.HDLCD.Alloftheabove8．Comparedwithrdt2.0,thenewserviceinrdt3.0istoimplementthereliabledatatransferoverthechannelwithBA.biterrorB.datalossC.datatransferdelayD.congestion9．TheRcvWindowfieldinTCPsegmentheaderisusedforB.A.congestioncontrolB.flowcontrolC.connectionsetupD.reliabledatatransfer10．ICMPcontrolmessagesaretransferredinDdataunit.A)TCPB.UDPC.ARPD.IP11．Whatisthemainfunctionofthetransportlayer?A.node-to-nodedelivB.process-to-processmessagedeliveryC.synchronization;D.updatingandmaintenanceofroutingtables12．Ifkisthenumberofbitsinthepacketsequencenumberfield,therangeofsequencenumbersisthusCA.[0,k]B.[0,2k]C.[0,2k-1]D.[0,k-1]13．Inputportofarouterdon’tperform____D___functions.A)thephysicallayerfunctionsB)thedatalinklayerfunctionsC)lookupandforwardingfunctionD)networkmanagement14．Therearetwobroadclassesofpacket-switchednetworks:datagramnetworksandvirtual-circuitnetworks.Thevirtual-circuitnetworksforwardpacketsintheirswitchesuse___D___.A)MACaddressesB)IPaddressesC)e-mailaddressesD)VCnumbers15．TheadvantageofCircuitswitchingdoesnotinclude___D_____.A)smalltransmissiondelayB)smallProcessingcostC)highlinkutilizationD)nolimitedtoformatofmessage16．Ifauserbringshiscomputerfromchengdutobeijing,andaccessesInternetagain.Now,___B__ofhiscomputerneedstobechanged.A)MACaddressB)IPaddressC)e-mailaddressD)useraddress17．IfIPaddressis102.100.100.32,subnetmaskis255.255.240.0,thensubnetprefixis___A___A)102.100.96.0B)102.100.0.0C)102.100.48.0D)102.100.112.018．Whichdevicecan’tisolatesthedepartmentalcollisiondomains.AA)HubB)switchC)routerD)AandB19．AnARPrequestisCto.A)unicast;allhostsB)multicast;manyhostsC)broadcast;allhostsD)unicast;onehost20．10BASE2ueseCcablewhile10BASE5usesA)thickcoaxial;thincoxialB)twistedpair;thickcoaxialC)thincoaxial;thickcoaxialD)fiberoptic;thincoaxial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14.三、填空题（每空1分，共20分）1．ThesendingandreceivingofinformationwithintheInternetarecontrolledbyProtocols.2．ReliabilityintheInternetisachievedthroughtheuseofacknowledgmentsandretransmissions.3．Anynetworkthatforwardspacketsaccordingtohostdestinationaddressesadatagramnetwork.4．WithintheInternetthemostimportantdelaysthatpacketsufferedareprocessingdelay,queuingdelay,transmissiondelay,andpropagationdelay.5．TheInternetprotocolstackconsistsoffivelayers:thephysical,link,network,transport,andapplicationlayers.6．AprocessisidentifiedbyIPaddress,aswellasportnumber.7．Twogenericformsofpipelinedreliabledatetransferprotocolsarego-Back-Nandselectiverepeat8．Thisjobofdeliveringthedatainatransport-layersegmenttothecorrectsocketiscalled__demultiplexing;9．DuringtheTCPconnectionsetup,thecontrolmessagesexchangedbetweenTCPclientandTCPserverareinturn：SYNSYNACKACK.10．AWebcachealsocalleda__Proxyserver___.11．Supposeausersittinginahomenetworkbehindhost10.0.0.1requestsaWebpageonsomeWebserver(port80)withIPaddress202.119.30.156,PleaseaccordingtheNATtranslationtableattheNATrouter.FillindatagramthatincludeportnumbersaswellasIPaddresses.（有IP缺端口号一个扣0.5分）四、判断题（每小题1分，共10分）1．Connectionlessserviceguaranteesthatdatatransmittedinorder.(N)2．Congestioncontrolmakessurethatneithersideofaconnectionoverwhelmstheothersidebysendingtoomanypacketstoofast.(N)3．AbrowserisauseragentfortheWeb.（Y）4．HTTPsenditscontrolinformationout-of-band(N)5．Socketistheprogramminginterfacebetweentheapplicationlayerandthenetworklayer.(N)6．WhenauserrequestsaWebpagethatconsistsofsometextandtwoimages.Forthispage,theclientwillsendonerequestmessageandreceivethreeresponsemessage.(N)7．ItispossibleforanapplicationtoenjoyreliabledatatransferevenwhentheapplicationrunsoverUDP.(Y)8．Anyprotocolthatperformshandshakingbetweenthecommunicationentitiesbeforetransferringdataisaconnection-orientedservice.(T)9．ThereisdifferenceinstructurebetweenIPaddressandMACaddress.IPaddressisflatandMACaddressishierarchical.(N)10．Thebasicse