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共用题干题Whenthesystemuponwhichatransportentityisrunningfailsandsubsequentlyrestarts,the(21)informationofallactiveconnectionsislost.Theaffectedconnectionsbecomehalf-open,asthesidethatdidnotfaildoesnotyetrealizetheproblem.Thestillactivesideofahalf-openconnectionscanclosetheconnectionusinga(22)timer.Thistimermeasuresthetimethetransportmachinewillcontinuetoawaitan(23)ofatransmittedsegmentafterthesegmenthasbeenretransmittedthemaximumnumberoftimes.Whenthetimer(24),thetransportentityassumesthateithertheothertransportentityortheinterveningnetworkhasfailed.Asaresult,thetimerclosestheconnection,andsignalsanabnormalclosetotheTSuser.Intheeventthatatransportentityfailsandquicklyrestarts,half-openconnectionscanbeterminatedmorequicklybytheuseoftheRSTsegment,thefailedsidereturnsanRSTitoeverysegmentithatitreceives.WhentheRSTireachestheotherside,itmustbecheckedforvaliditybasedonthe(25)numberi,astheRSTcouldbeinresponsetoanoldsegment.Iftheresetisvalid,thetransportentityperformsanabnormaltermination.空白处(25)应选择()
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