GATE CS 2020 Set 1 — Question 65
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Computer Networks → Transport Layer → TCP Congestion Control
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Question
Consider a TCP connection between a client and a server with the following specifications: the round trip time is ms, the size of the receiver advertised window is KB, slow-start threshold at the client is KB, and the maximum segment size is KB. The connection is established at time . Assume that there are no timeouts and errors during transmission. Then the size of the congestion window (in KB) at time ms after all acknowledgements are processed is _______.
Correct answer
44 to 44
Solution
Given:
- Round Trip Time () = ms
- Receiver Window () = KB
- Slow Start Threshold () = KB
- Maximum Segment Size () = KB
- Connection established at
1.At : Connection established. Transmission starts. Initial KB. The TCP is in the Slow Start phase.
2.At ms (End of 1st RTT):
- In Slow Start, doubles every RTT.
- KB.
- KB.
- KB.
- KB.
- Now, has reached the ( KB). The algorithm switches to Congestion Avoidance.
- In Congestion Avoidance, increases linearly by per RTT.
- KB.
- KB.
- KB.
- KB.
- KB.
- KB.
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