Using ________,a sender retransmits a segment before timeout because it infers that the segment was lost.If the sender subsequently receives an acknowledgement that does not cover all of the segments transmitted before this is initiated,the sender may infer that two segments were lost from the current window and retransmit an additional segment.
A)fast retransmit
B)backoff
C)outward data dissemination
D)Karn's Algorithm

Question

Quizplus · Accepted Answer

The described behavior is characteristic of the Fast Retransmit algorithm. It is a mechanism used by TCP to detect and recover from segment loss in the network. Rather than waiting for a timeout to occur and to retransmit all the segments in the window, the sender infers that a segment has been lost when it receives three consecutive duplicate acknowledgments for the same sequence number. This indicates that the receiver has received some but not all segments in the window, and that the lost segment is likely the one that immediately follows the acknowledged segments. Therefore, the sender retransmits that lost segment without waiting for a timeout. The Fast Retransmit algorithm helps to reduce latency and increase throughput in networks with moderate congestion.

Using ________,A Sender Retransmits a Segment Before Timeout Because It