GATE CS 2022 Set 1 — Question 60
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Computer Networks → Transport Layer → TCP Segment Format
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Question
Consider the data transfer using TCP over a link. Assuming that the maximum segment lifetime (MSL) is set to , the minimum number of bits required for the sequence number field of the TCP header, to prevent the sequence number space from wrapping around during the MSL is____________.
Correct answer
33 to 33
Solution
To prevent the sequence number space from wrapping around during the Maximum Segment Lifetime (), the total number of unique sequence numbers available must be at least the total number of bytes transmitted during that period.
Taking on both sides:
Since the number of bits must be an integer, the minimum number of bits required is .
1.Calculate the data rate in bytes per second:
2.Calculate the total data transmitted during MSL:
3.Determine the number of bits () required for the sequence number field:
The sequence number space with bits is . We need:Taking on both sides:
Since the number of bits must be an integer, the minimum number of bits required is .
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