TCP Slowstart

• exponential increase (per RTT) in window size (not so slow!)

• loss event: timeout (Tahoe TCP) and/or or three duplicate ACKs (Reno TCP)

initialize: Congwin = 1

for (each segment ACKed)

Congwin++

until (loss event OR

CongWin > threshold)

Host A

one segment

RTT

Host B

two segments

four segments

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