四川大学计算机网络与通信期末考试08-09A

四川大学期末考试试题（A）闭卷（2008——2009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.ADSL非对称数字用户线路2.Packetswitching分组交换3.PPP点到点4.DHCP动态主机配置协议5.PDU协议数据单元6.MIME用途互联网邮件扩展7.IMAPInternet消息访问协议8.NAT网络地址转换9.ICMPInternet控制信息协议10.ARP地址解析协议二、单项选择题（每小题l.5分，共30分)1．AisaCircuit-switchednetwork.A.TDMB.DatagramnetworkC.InternetD.virtualcircuitnetwork2．Thestore-and-forwarddelayisDA.processingdelayB.queuingdelayC.propagationdelayD.transmissiondelay3．Whichisnotthefunctionofconnection-orientedservice?CA.flowcontrolB.congestioncontrolC.errorcorrectionD.reliabledatatransfer4．TheIPprotocolliesinCA.applicationlayerB.transportlayerC.networklayerD.linklayer5．WhichofthefollowingisthePDUforapplicationlayer__B___.A.datagram;B.message;C.frame;D.segment6．bandwidthisdescribedin_B__A)BytespersecondB)BitspersecondC)megabitspermillisecondD)centimeters7．AuserwhousesauseragentonhislocalPCreceiveshismailsitedinamailserverbyusing_B___protocol.A)SMTPB)POP3C)SNMPD)FTP8．Asadatapacketmovesfromthelowertotheupperlayers,headersareB.A)Added;B.subtracted;C.rearranged;D.modified9．InTCP/IPstack,thetransportlayerbuildstheconnectionbyCA)slowstartB)negotiationC)threehand-shakingD)slidingwindow10．ThemainfunctionoftransportlayeristoprovideCdatadelivery.A)nodetonodeB).pointtopointC).processtoprocessD).neighbortoneighbor11．InTCP/IPmodel,dataunitsfromapplicationlayertodatalinklayerareB.A)messagedatagramframesegmentB)messagesegmentdatagramframeC)segmentdatagramframemessageD)datagrammessageframesegment12．ThedefinitionofreliabledeliveryincludesD.A).Error-freedeliveryB).ReceiptofthecompletemessageC)In-orderdeliveryD).Alloftheabove13．Thetracerouteisimplementedwith___B_____messagesA)DNSB)ICMPC)ARPD)RIP14．FragmentswhicharesmallerIPdatagramsneedtobereassembleatthe___B_____A)thedestinationrouterB)thedestinationhostC)thenextrouterD)anyrouterandhost15．Whichroutingprotocolisthedefectofstandardinter-ASroutingprotocolintoday’sInternet._D____A)RIPB)OSPFC)IGPD)BGP16．Thevirtual-circuitnetworksforwardpacketsintheirswitchesuse_D_____.A)MACaddressesB)IPaddressesC)e-mailaddressesD)VCnumbers17．packet-switchingtechnologiesthatusevirtualcircuitsinclude__D_____:A)X.25,IPB)X.25,framerelay.C)IPX,IPD)IP,TCP18．Therearetwobroadclassesofpacket-switchednetworks:datagramnetworksandvirtual-circuitnetworks.datagramnetworksforwardpacketsintheirswitchesuse_B_____.A)MACaddressesB)IPaddressesC)e-mailaddressesD)virtual-circuitnumbers19．.ifahostwantstoemitadatagramtoallhostsonthesamesubnet,thenthedatagram’sdestinationIPaddressis_______B___________A)255.255.255.0B)255.255.255.255C)255.255.255.254D)127.0.0.120．HubfunctionisintheAlayer.A)physical;B)datalink;C)Network;D)aandb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纸打印三、填空题（每空1分，共20分）1．Internetprovidesboth__connection-orientedandconnectionlessservicestoapplications2．Internetuses_packetswitching_ratherthancircuit-switchingtechnology.3．ElectronicmailincludinguseragentsmailserversandSMTPthreemajorcomponents.4.Aprocessisidentifiedbyipaddressaswellasportnumber.5．Twoimportantnetwork-layerfunctioncanbeidentified:forwarding,routing.6．Networklayerserviceshandledatatransferbetweenhosts,transportlayerserviceshandledatatransferbetweenprocesses7．AnARPrequestisbroadcast__toallhostandanARPreplyis__unicast_onehost;8．Alink-layeraddressisvariouslycalleda_lan_address,or_physical_address,or__MAC_address.9.Datalinklayerpacketisframe10．SupposethatHostAhasestablishedaconnectiontoaprocessintheserver.Pleasefillinthesegmentscontainingdatathattheclientandserverhostscansendtoeachother.四、判断题（每小题1分，共10分）1．TheinternetapplicationssuchasSMTP,HTTP,TELNETusUDP,theinternet’sconnectionless-orientedserviceF2．HTTPismainlyapushprotocolandSMTPismainlyapullprotocolF3．ThetimerequiredtopropagatefromthebeginningofthelinktoarouteristhepropagationdelayT4．FTPsenditscontrolinformationout-of-bandT5．linklayeraddressisIPaddressF6．AnARPresponsesentwithinaframewithaspecificdestinationMACaddressT7．AnIPaddressistechnicallyassociatedwiththehostorrouterF8．Adistance-vector(DV)algorithmcomputestheleast-costpathbetweenasourceanddestinationusingcomplete,globalknowledgeaboutthenetworkF9．DevicesinasubnetcanphysicallyreacheachotherwithoutinterveningrouterT10．.Inpacket-switchednetworks,asession’smessagesusetheresourcesondemand,andInternetmakesitsbestefforttodeliverpacketsinatimelymannerTSourceport=1300Destport=21Sequencenumber=1235Acknowledgmentnumber=67905SYN=0ACKReceivewindowChecksumNIL1000bytesdataSourceport=__21_Destport=_1300__Sequencenumber=6790____Acknowledgmentnumber=2235____5SYN=0ACKReceivewindowChecksumNIL1000bytesdata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IfHostAHostBThenHostAHostB五、计算题(30points)1.considerthefollowingnetwork.Withtheindicatedlinkcosts,useDijkstra’sshortest-pathalgorithmtocomputetheshortestpathfromWtoallnetworknode