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ID:38635779
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页数:4页
时间:2019-06-16
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1、学年第学期计算机网络A课程A卷标准答案及评分标准使用班级:一、MultipleChoice(20points,2pointseachproblem)1、A2、A3、C4、C5、C6、A7、B8、C9、D10、B二、FillintheBlanks(24points,2pointseachproblem)1、digitalsubscriberline(DSL)(1分)、hybridfiber-coaxialcable(HFC)(1分)2、withoutpipelining(0.5分)、withpipelining(0.5分)、withoutpipelining(1分)3、adis
2、tributeddatabaseimplementedinahierarchyofDNSservers(1分)、anapplication-layerprotocolthatallowshoststoquerythedistributeddatabase(1分)4、virtual-circuitnetworks(1分)、datagramnetworks(1分)5、inputports(0.5分)、outputports(0.5分)、switchingfabric(0.5分)、routingprocessor(0.5分)6、RIP(0.5分)、OSPF(0.5分)、RIP(1分
3、)7、demultiplexing(1分)、multiplexing(1分)8、channelpartitioning(0.5分)、randomaccess(0.5分)、taking-turns(1分)9、6(1分)、128(1分)10、conditionalGET(2分)11、Go-Back-N(0.5分)、selectiverepeat(0.5分)、selectiverepeat(1分)12、circuit(0.5分)、packet(0.5分)、circuit(1分)三、TrueorFalse(10points,1pointeachproblem)1、T2、F3、T4、F
4、5、T6、F7、F8、F9、T10、T四、Answerthefollowingquestionsbriefly.(33points)1、ThefivelayersintheInternetprotocolstackare–fromtoptodown-theapplicationlayer,thetransportlayer,thenetworklayer,thelinklayer,andthephysicallayer.(2分)Theprincipalresponsibilitiesare:Theapplicationlayeriswherenetworkapplicatio
5、nsandtheirapplication-layerprotocolsreside;(1分)thetransportlayertransportsapplication-layermessagesbetweentheclientandserversidesofanapplication;(1分)thenetworklayerisresponsibleformovingnetwork-layerpacketsknownasdatagramsfromonehosttoanother;(1分)thelink-layerhasresponsibilityoftransferring
6、framefromonenodetoadjacentnodeoveralink;(1分)thejobofthephysical-layeristomovetheindividualbitswithintheframefromonenodetothenext.(1分)2、MessageissentfromAlice’shosttohermailserveroverHTTP.(2分)Alice’smailserverthensendsthemessagetoBob’smailserveroverSMTP.(1分)Bobthentransfersthemessagefromhism
7、ailservertohishostoverPOP3.(1分)3、Thefourcomponentsare:acookieheaderlineintheHTTPresponsemessage;acookieheaderlineintheHTTPrequestmessage;acookiefilekeptontheuser’sendsystemandmanagedbytheuser’sbrowser;aback-enddatabaseattheWebsite.(4分)Whentheuserfirstvis
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