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Q. What is Retransmission timer?
Retransmission timer
- not fixed because paths that IP packets take may differ
- If too short - retransmissions -> waste of bandwidth
- If too large - delay for the application program
RTT = * previous RTT + (1- ?)*current RTT, usually 90 %
Karn's algorithm:
- don't consider the RTT of a retransmitted segment in the calculation of the new RTT
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Ans) UDP TCP SPX
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