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Consider the following statements regarding the slow start phase of the TCP congestion control algorithm. Note that cwnd stands for the TCP congestion window and MSS denotes the Maximum Segment Size. (i) The cwnd increases by 2 MSS on every successful acknowledgement. (ii) The cwnd approximately doubles on every successful acknowledgement. (iii) The cwnd increases by 1 MSS every round trip time. (iv) The cwnd approximately doubles every round trip time. Which one of the following is correct?

1. Only (ii) and (iii) are true
2. Only (i) and (iii) are true
3. Only (iv) is true
4. Only (i) and (iv) are true

Correct answer: Only (iv) is true

Solution

During slow start cwnd increases by 1 MSS per ACK, which makes it roughly double every round-trip time. So (i) and (ii) (per-ACK doubling/+2) are false and (iii) (+1 MSS per RTT) is false; only (iv) (doubles every RTT) is true.

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