计算机网络原理习题答案

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1、ReviewQuestionsSection2.11)Listfivenon-proprietary（非专有的）Internetapplicationsandtheapplication-layerprotocolsthattheyuse.列举五种非专用的英特网应用以及它们所使用的应用层协议。applicationsprotocols e-mail SMTP WEBHTTPstreamingmultimediaHTTP ,RTPfiletransfer  FTPremoteterminalaccess  Telne

2、t 2)Foracommunicationsession(会议)betweentwohosts,whichhostistheclientandwhichistheserver?对俩主机之间的通信会话，哪个主机是客户机，哪个主机是服务器？Theprocesswhichinitiates（发起）thecommunicationistheclient;theprocessthatwaitstobecontactedistheserver.3)Whatinformationisusedbyaprocessrunningon

3、onehosttoidentifyaprocessrunningonanotherhost?运行在一台主机上的进程使用什么信息标识运行在另一台主机上的进程？TheIPaddressofthedestinationhostandtheportnumberofthedestinationsocket.1)Listthevariousnetwork-applicationuseragentsthatyouuseonadailybasis.列举你每天都会使用的网络应用程序用户代理。WebbrowserE-mailappli

4、cationuseragent FileTransferuseragentP2puseragentaudio/videouseragent 5)ReferringtoFigure2.1-2,weseethatnotnoneofapplicationslistedinthetablerequireboth"nodataloss"and"timing".Canyouconceiveofanapplicationthatrequiresnodatalossandthatisalsohighlytimesensitive?

5、参见图2.1-2，我们可以看到表中所列举的应用没有一个既要求没有数据丢失又要求定时。你能设想出一个应用，既既要求没有数据丢失又要求定时吗？Therearenogoodexamplesofanapplicationthatrequiresnodatalossandtiming.Sections2.2-2.56)Whatismeantbyahandshakingprotocol?握手协议的意义？Aprotocoluseshandshakingifthetwocommunicatingentitiesfirstexcha

6、ngecontrolpacketsbeforesendingdatatoeachother.SMTPuseshandshakingattheapplicationlayerwhereasHTTPdoesnot.7)WhydoHTTP,FTP,SMTP,POP3andIMAPrunontopofTCPratherthanUDP?为什么HTTP，FTP，SMTP，POP3和IMAP都运行在TCP协议而不是UDP协议上？Theapplicationsassociatedwiththoseprotocolsrequiret

7、hatallapplicationdatabereceivedinthecorrectorderandwithoutgaps.TCPprovidesthisservicewhereasUDPdoesnot.8)Considerane-commercesitethatwantstokeepapurchaserecordforeachofitscustomers.DescribehowthiscanbedonewithHTTPauthentication.（认证）Describehowthiscanbedonewith

8、cookies.考虑一个电子商务网站需要保留每一个客户的购买记录，描述如何使用HTTP认证；描述这是如何用cookies来实现的。Whentheuserfirstvisitsthesite,thesitereturnsacookienumber.Thiscookienumberisstoredontheuser’shostandismanagedbytheb