(source)thatistransferringthefileto?Toanswerthisquestion,it’sprobablyeasiesttoselectanHTTPmessageandexplorethedetailsoftheTCPpacketusedtocarrythisHTTPmessage,usingthe“detailsoftheselectedpacketheaderwindow”(refertoFigure2inthe“GettingStartedwithWireshark”Labifyou’reuncertainabouttheWiresharkwindows).答:puter(source):IPaddress:TCPportnumber:?OnwhatportnumberisitsendingandreceivingTCPsegmentsforthisconnection?答:theIPaddressof:IPaddress:portnumber:,answerthefollowingquestion:puter(source)totransferthefileto?答:puter:IPaddress:?WhatisitinthesegmentthatidentifiesthesegmentasaSYNsegment?答:sequencenumber:0;syn被设置为1说明是syn段。?WhatisthevalueoftheACKnowledgementfieldintheSYNACKsegment?hatvalue?WhatisitinthesegmentthatidentifiesthesegmentasaSYNACKsegment?答:ThesequencenumberoftheSYNACKsegmentsentbyis:0;SYNACKsegment中ACKnowledgement的值为1;ACKnowledgementnumber的值为SYN消息中sequencenumber加上1所得;?mand,you’llneedtodigintothepacketcontentfieldatthebottomoftheWiresharkwindow,lookingforasegmentwitha“POST”:(includingthesegmentcontainingtheHTTPPOST)?Atwhattimewaseachsegmentsent?WhenwastheACKforeachsegmentreceived?GiventhedifferencebetweenwheneachTCPsegmentwassent,andwhenitsacknowledgementwasreceived,whatistheRTTvalueforeachofthesixsegments?WhatistheEstimatedRTTvalue(seepage249intext)afterthereceiptofeachACK?AssumethatthevalueoftheEstimatedRTTisequaltothemeasuredRTTforthefirstsegment,putedusingtheEstimatedRTTequationonpage249forallsubsequent:“listingofcapturedpackets”:Statistics->TCPSt
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