# GATE | GATE-CS-2009 | Question 60

While opening a TCP connection, the initial sequence number is to be derived using a time-of-day(ToD) clock that keeps running even when the host is down. The low order 32 bits of the counter of the ToD clock is to be used for the initial sequence numbers. The clock counter increments once per millisecond. The maximum packet lifetime is given to be 64s.
Which one of the choices given below is closest to the minimum permissible rate at which sequence numbers used for packets of a connection can increase?
(A) 0.015/s
(B) 0.064/s
(C) 0.135/s
(D) 0.327/s

Explanation: The maximum packet lifetime is given to be 64 seconds in the question.
Thus, a sequence number increments after every 64 seconds.

So, minimum permissible rate = 1 / 64 = 0.015 per second

Thus, option (A) is the answer.

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