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in TCP the method of ensuring reliability is through acknowledgements and time-out mechanisms. For every segment sent, the sender waits for an ACK for that segment. It resends the packet if it does not receive an ACK before the time-out occurs.
- vp January 09, 2011In fast retransmit, if the sender gets 3 NACKS ( negative acknowledgement) then it immediately retransmits the packet without waiting for the time-out to occur. This concept is called Fast retransmit in TCP.