Consider a long-lived TCP session with an end-to-end bandwidth of 1 Gbps (= 10⁹ 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 _______.

Question

Question

This question was previously asked in

GATE CS 2018 Official Paper

Answer 1

Anwer range 34 to 35

Calculation:

1 Gb → 1 second

Sequence number = 32 bits

And since it counts every byte

The minimum time before this sequence number can be used again in 35 seconds.

Confusion Points

Since to repeat a sequence number time > 34 seconds and hence the closest integer should be 35 seconds

but in the question, it is given to rounding to the closest integer (34.3597 ≈ 34 ).