TCP Retransmission

• TCP will retransmit a segment upon expiration of an adaptive transmission timer.

• The timer is variable.

• When TCP transmits a segment, it records the time of transmission and the sequence number of the segment.

• When TCP receives an acknowledgment, it records the time.

• This allows TCP to build a sample round-trip delay time.

• TCP will build an average delay time for a packet to be sent and received.

• The timer is slowly changed to allow for the varying differences in the Internet.

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