GATE 2018 CS – Question 35
Consider a long-lived TCP session with an end-to-end bandwidth of 1 Gbps ($=10^9$ bits-per-second). The session starts with a sequence number of 1234. The minimum time (in seconds, rounded to the closest integer) before this sequence number can be used again is ________.
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Correct answer: 34
Explanation
The sequence number space has $2^{32}$ byte numbers. At 1 Gbps the sender can send $\frac{10^9}{8}$ bytes per second, so wrapping takes $\frac{2^{32}\times8}{10^9}=34.4\approx34$ seconds.