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时间:2019-08-06
《2014-2015学年上学期2013级中期考试试卷答案》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、云南大学2014至2015学年上学期软件学院2013级《计算机网络原理》期中考试试卷(闭卷)满分:100分考试时间:100分钟任课教师:王世普学院:专业:学号:姓名:(注意:答题可以用中文、也可以用英文)得分表:题号一二三四五总分得分第一题答题卡:小题号12345678910回答ACDBBBABAB第二题答题卡:小题号12345回答×√×××一、单项选择题(每个选项1分,共10分,请将选择结果填入第一题答题卡)1.(1)istheprotocolsuiteforthecurrentInternet..(1)A.TCP/IPB.NCPC.UN
2、IXD.ACM2.AJPEGimageissentasemail,Whatisthecontent-type(2).(2)A.multipart/mixedB.multipart/imageC.image/JPEGD.image/basic3.AuserwanttosendsomeinformationtoWebserverusingHTTPprotocol,therequestlinemethodis(3).(3)A.GETB.PATCHC.MOVED.POST-8-4.IfaTCPsegmentcarriesdataalongwitha
3、nacknowledgment,thistechnologyiscalled(4)acknowledgment.(4)A.backpackingB.piggybackingC.piggyingD.mother’shelp5.UDPisa(5)transportlayerprotocolthatsimplyallowdatatobeexchangedwithout(6).Soitrequiresotherprotocolstohandleerrorprocessingand(7).(5)A.connectionB.connectionless
4、C.joinD.disconnection(6)A.datagramsB.acknowledgementsC.dataD.segment(7)A.retransmissionB.sendC.receiveD.acknowledgements6.AuserrequestsaWebpagethatconsistsofabasicHTMLfileand3JPEGimagefiles.dtransdenotingthetimetotransferafile.Thetotaltimeis(8)torequesttheWebpageinpersiste
5、ntconnectionsmode?(8)A.4(2RTT+dtrans)B.2RTT+4dtransC.RTT+4dtransD.4(RTT+dtrans)7.HostAsendsaTCPsegment(Seq=43,ACK=103)tohostBandHostBreplieswithaTCPsegment(Seq=103,ACK=57).ThepayloadlengthoftheTCPsegmentfromhostAtohostBis(9).(9)A.14bytes.B.43bytes.C.46bytes.D.57bytes.8.Asa
6、datapacketmovesfromthelowertotheupperlayers,headerare(10).(10)A.addedB.subtractedC.rearrangedD.modified二、判断正误(每个问题1分,共5分。正确的打“√”、错误的打“×”,请将判断结果填入第二题答题卡)1.TheDNSdefinesadistributed,hierarchicaldatabasethatprovidesonlyhostnametoIPaddressmappings.(×)2.The“Last-Modified:”heade
7、rlineintheHTTPresponsemessageindicateswhentheobjectintheresponsemessagewaslastmodified.(√)3.Ifsequencenumberiskbit,thenthesendwindowmaximumsizeofGBNprotocolisequalto2k-1.(×)4.TheUDPheaderchecksumisrecomputedateveryrouters.(×)-8-5.SupposethatthelastSampleRTTinaTCPconnection
8、isequalto1sec.ThenTimeoutfortheconnectionwillnecessarilybesettoavalue>=1sec.(×)三、回答下列问题(每
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