Like described over, the timer of rebroadcast it serves to verify that every transmitted segment comes found.
The corrected formulation of this timer is difficult but a lot important, in how much a timer too much short it involves useless rebroadcasts (the timer releases while the reply or the package is still in travel), while a timer too much along it involves waits in case of loss of packages.
TCP continuously fixes the timer of rebroadcast being based on a mobile esteem to average of the Round Trip Time.
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