In the slow start phase of the TCP congestion control algorithm, the s

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Module 4: Transport Layer & Congestion Control

20162m

In the slow start phase of the TCP congestion control algorithm, the size of the congestion window:
(i) does not increase
(ii) increases linearly
(iii) increases quadratically
(iv) increases exponentially

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Answer: (iv) increases exponentially

Why: In slow start the congestion window grows by one MSS for every ACK received, which doubles cwnd every RTT (1 -> 2 -> 4 -> 8 ...), i.e. exponential growth. Linear (additive) increase of +1 MSS per RTT begins only after cwnd reaches ssthresh, in the congestion-avoidance phase.

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