2. 计算机
  3. When　the　system　upon　which　a　transport　entity　is　running　fails　and　subsequently　restarts,　the(66)information　of　all　active　conne

When　the　system　upon　which　a　transport　entity　is　running　fails　and　subsequently　restarts,　the(66)information　of　all　active　conne

admin2008-01-06  44
问题 When　the　system　upon　which　a　transport　entity　is　running　fails　and　subsequently　restarts,　the(66)information　of　all　active　connections　is　lost.　The　affected　connections　become　half-open,　as　the　side　that　did　not　fail　does　not　yet　realize　the　problem.The　still　active　side　of　a　half-open　connection　can　close　the　connection　using　a(67)timer.　This　timer　measures　the　time　the　transport　machine　will　continue　to　await　an(68)of　a　transmitted　segment　after　the　segment　has　been　retransmitted　the　maximum　number　of　times.　When　the　timer(69),　the　transport　entity　assumes　that　either　the　other　transport　entity　or　the　intervening　network　has　failed.　As　a　result,　the　timer　closes　the　connection,　and　signals　an　abnormal　close　to　the　TS　user.In　the　event　that　a　transport　entity　fails　and　quickly　restarts,　half-open　connections　can　be　terminated　more　quickly　by　the　use　of　the　RST　segment.　The　failed　side　returns　an　RST　i　to　every　segment　i　that　it　receives.　When　the　RST　i　reaches　the　other　side,　it　must　be　checked　for　validity　based　on　the(70)number　i,　as　the　RST　could　be　in　response　to　an　old　segment.　If　the　reset　is　valid,　the　transport　entity　performs　an　abnormal　termination.
选项 A、sequence
B、acknowledgment
C、connection
D、message
答案A
解析
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