計(jì)算機(jī)網(wǎng)絡(luò)實(shí)驗(yàn)報(bào)告-實(shí)驗(yàn)五 探索TCP協(xié)議.doc

1陜西師范大學(xué)計(jì)算機(jī)網(wǎng)絡(luò)實(shí)驗(yàn)報(bào)告實(shí)驗(yàn)五探索TCP協(xié)議一、實(shí)驗(yàn)?zāi)康?.熟悉并掌握wireshark的操作。2.通過(guò)實(shí)驗(yàn)分析并掌握TCP是如何進(jìn)行數(shù)據(jù)傳輸?shù)?，及其如何?shí)現(xiàn)擁塞控制、流量控制等二、實(shí)驗(yàn)器材1.PC機(jī)電腦一臺(tái)。2下載wireshark軟件并安裝三、實(shí)驗(yàn)內(nèi)容通過(guò)實(shí)驗(yàn)分析并掌握TCP是如何進(jìn)行數(shù)據(jù)傳輸?shù)?，及其如何?shí)現(xiàn)擁塞控制、流量控制等四、問(wèn)題回答1.CapturingabulkTCPtransferfromyourcomputertoaremoteServerGothe/wiresharklabs/alice.txtandretrieveanASCIIcopyofAliceinWonderland.Storethisfile.somewhereonmycomputer.Nextgoto/wireshark-labs/TCP-wireshark-file1.html.ThenIcanseeascreenthatlookslike:2,startupWiresharkandbeginpacketcapture.Returningtobrowser,pressthe“Uploadalice.txtfile”server.StopWiresharkpacketcapture.TheWiresharkwindowlikethis:ThenopeningtheWiresharkcapturedpacketfiletcpethereal-trace-1in/wireshark-labs/wireshark-traces.zip32.Afirstlookatthecapturedtrace1.WhatistheIPaddressandTCPportnumberusedbytheclientcomputer(source)?Toanswerthisquestion,itsprobablyeasiesttoselectanHTTPmessageandexplorethedetailsoftheTCPpacketusedtocarrythisHTTPmessage,usingthe“detailsoftheselectedpacketheaderwindow”(refertoFigure2inthe“GettingStartedwithWireshark”LabifyoureuncertainabouttheWiresharkwindows).答：clientcomputer(source)：IPaddress：02ipaddressTcpportnumber4TCPportnumber：11612.WhatistheIP?OnwhatportnumberisitsendingandreceivingTCPsegmentsforthisconnection?答：theIP：IPaddress：2portnumber：803.Ifyouhavebeenabletocreateyourowntrace,answerthefollowingquestion:WhatistheIPaddressandTCPportnumberusedbyyourclientcomputer(source)?ipaddress:portnumber5答：Myclientcomputer:IPaddress:0ipaddress:TcpportnumberThenWiresharkdothis,selectAnalyze-EnabledProtocols.ThenunchecktheHTTPboxandselectOK.nowseeanWiresharkwindowthatlookslike:63.TCPBasicsAnswerthefollowingquestions；4.WhatisthesequencenumberoftheTCPSYNsegmentthatisusedtoinitiatetheTCP?WhatisitinthesegmentthatidentifiesthesegmentasaSYNsegment?答：sequencenumber:0；syn被設(shè)置為1說(shuō)明是syn段。SequencenumberSynis175.WhatisthesequencenumberoftheSYNACKtotheclientcomputerinreplytotheSYN?WhatisthevalueoftheACKnowledgementfieldintheSYNACKsegment?Hdeterminethatvalue?WhatisitinthesegmentthatidentifiesthesegmentasaSYNACKsegment?答：ThesequencenumberoftheSYNACKis:0；SYNACKsegment中ACKnowledgement的值為1；ACKnowledgementnumber的值為SYN消息中sequencenumber加上1所得；SYN和Acknowledgementf都置為1說(shuō)明這是一個(gè)SYNACKsegment.6.WhatisthesequencenumberoftheTCPsegmentcontainingtheHTTPPOSTcommand?NotethatinordertofindthePOSTcommand,youllneedtodigintothepack