南京信息工程大学2009-2010学年第一学期Internet Technologies课程试卷及答案(A卷).pdf

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1、南京信息工程大学试卷2009－2010学年第一学期InternetTechnologies课程试卷(A卷)本试卷共3页；考试时间120分钟；任课教师朱节中；出卷时间09年12月系专业年级班学号姓名得分A.Fillintheblanks（10X1score=10scores）1.Scientistsandengineersdevisedwaystobuildnetworksthatconnectedmultiplecomputersacrosslargegeographicdistances,whic

2、hiscalledinternetorlong-haulnetworks.2.istheInternet'sorigins.3.Webpagesarewritteninacomputerlanguage,whichishtml4.HTTPuseswhatnumericvalue,indecimal,ofthedestinationportfieldoftheTCPheader?805.POP3protocolweusetoreceiveemail。6.Ancanbeusedtoprotectapri

3、vatenetworkfromoutsideattack.7.Todaythereareencryptionsystemsthatusetwokeys,oneforencryptionandonefordecryption.Thekeyusedfordecryptioniscalledapublickeybecauseitmustbekeptsecret.Thekeyusedforencryptioniscalledaprivatekeybecauseitcanbedistributedtoanyo

4、ne.8.Thestandardprotocolforremoteloginisknownaspop3.9.TheHTMLtag<.BR.>instructsabrowsertobeginanewline.B.Explainabbreviation（10X2=20scores）1.TCP：TransmissionControlProtocol2.UDP：UserDatagramProtocol3.HTTP:HyperTextTransferProtocol4.FTP:FileTransferProt

5、ocol5.WWW；WorldWideWeb6.SMTP：SimpleMailTransferProtocol7.DNS：DomainNameSystem8.HTML：HyperTextMark-upLanguage9.IP：InternetProtocol10.ADSL：AsymmetricDigitalSubscriberLineC.Shortanswer(55scores)11.What’sOSIreferencemodel？What’sTCP/IPreferencemodel?Pleaseu

6、sefiguretoexplainyouranswer.（10scores）物理层（PhysicalLayer）数据链路层（DatalinkLayer）网络层（NetworkLayer）传输层（TransportLayer）会话层（SessionLayer）表示层（PresentationLayer）应用层（ApplicationLayer）应用层（applicationlayer）传输层（transportlayer）互连层（internetlayer）主机-网络层（host-to-network

7、layer2.Sincealloutgoingdatagramshavethesamereturnaddress,howcanaNATboxknowwhichcomputershouldreceivearesponsedatagramthatarrivesfromtheInternet?（10scores）ANATboxkeepsarecordofwhateachcomputerisdoing.WhenadatagramarrivesfromtheInternet,theNATboxconsults

8、itsrecordstodeterminewhichcomputershouldreceivethedatagram.TheNATboxreplacesthe"to"addressofanincomingdatagramwiththelocaladdressofthecorrectdestinationcomputer.3.PleasewritethecorrectroutertableofR3inthebelowfigure.(Note:Thepacketcanar