Slow-Start and Congestion Avoidance (1)


Two communication phases for increasing congestion window

Slow Start
used at the beginning of a transfer, or after timeout.  
starts from minimum window size
Increases congestion window size by MSS bytes for each ACK received.
increases window size exponentially

Congestion Avoidance
Increases congestion window size by MSS / cwnd bytes for each ACK received.
increases window size linearly