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ID:9383755
大小:33.28 KB
页数:6页
时间:2018-04-29
《2.+第二章课后习题及答案》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、第二章1.(Q2)Foracommunicationsessionbetweenapairofprocesses,whichprocessistheclientandwhichistheserver?Answer:Theprocesswhichinitiatesthecommunicationistheclient;theprocessthatwaitstobecontactedistheserver..2.(Q3)Whatisthedifferencebetweennetworkarchitectureanda
2、pplicationarchitecture?Answer:Networkarchitecturereferstotheorganizationofthecommunicationprocessintolayers(e.g.,thefive-layerInternetarchitecture).Applicationarchitecture,ontheotherhand,isdesignedbyanapplicationdeveloperanddictatesthebroadstructureoftheappli
3、cation(e.g.,client-serverorP2P)3.(Q4)Whatinformationisusedbyaprocessrunningononehosttoidentifyaprocessrunningonanotherhost?Answer:TheIPaddressofthedestinationhostandtheportnumberofthedestinationsocket.4.(Q6)ReferringtoFigure2.4,weseethatnoneoftheapplicationli
4、stedinFigure2.4requiresbothnodatalossandtiming.Canyouconceiveofanapplicationthatrequiresnodatalossandthatisalsohighlytime-sensitive?Answer:Therearenogoodexampleofanapplicationthatrequiresnodatalossandtiming.Ifyouknowofone,sendane-mailtotheauthors5.(Q9)WhydoHT
5、TP,FTP,SMTP,andPOP3runontopofTCPratherthanonUDP?Answer:Theapplicationsassociatedwiththoseprotocolsrequirethatallapplicationdatabereceivedinthecorrectorderandwithoutgaps.TCPprovidesthisservicewhereasUDPdoesnot.6.(Q11)Whatismeantbyahandshakingprotocol?Answer:Ap
6、rotocoluseshandshakingifthetwocommunicatingentitiesfirstexchangecontrolpacketsbeforesendingdatatoeachother.SMTPuseshandshakingattheapplicationlayerwhereasHTTPdoesnot.7.(Q13)TelnetintoaWebserverandsendamultilinerequestmessage.IncludeintherequestmessagetheIf-mo
7、dified-since:headerlinetoforcearesponsemessagewiththe304NotModifiedstatuscode.Answer:Issuedthefollowingcommand(inWindowscommandprompt)followedbytheHTTPGETmessagetothe“utopia.poly.edu”webserver:>telnetutopia.poly.edu80Sincetheindex.htmlpageinthiswebserverwasno
8、tmodifiedsinceFri,18May200709:23:34GMT,thefollowingoutputwasdisplayedwhentheabovecommandswereissuedonSat,19May2007.Notethatthefirst4linesaretheGETmessageandheaderlinesinputbytheuserandthe
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