GATE CS 2018 Set 1 — Question 24
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Computer Networks → Transport Layer → TCP Congestion Control
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Question
Consider the following statements regarding the slow start phase of the TCP congestion control algorithm. Note that stands for the TCP congestion window and MSS denotes the Maximum Segment Size.(i) The increases by 2 MSS on every successful acknowledgment.
(ii) The approximately doubles on every successful acknowledgement.
(iii) The increases by 1 MSS every round trip time.
(iv) The approximately doubles every round trip time.Which one of the following is correct?
(ii) The approximately doubles on every successful acknowledgement.
(iii) The increases by 1 MSS every round trip time.
(iv) The approximately doubles every round trip time.Which one of the following is correct?
Correct answer
(C) Only (iv) is true
Solution
In the TCP slow start phase:
- For every successful acknowledgment (ACK) received, the congestion window () increases by 1 MSS. This means statement (i) and (ii) are incorrect.
- Because the window size increases by 1 MSS for every segment acknowledged, if a full window of segments is acknowledged in one round trip time (RTT), the window size effectively doubles to for the next RTT. Thus, the approximately doubles every round trip time. Statement (iv) is true.
- Statement (iii) describes the congestion avoidance phase (Additive Increase), not the slow start phase.
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