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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?
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- 0.015/s
- 0.064/s
- 0.135/s
- 0.327/s
- 0.015/s
Correct Option: A
Since if we increment 1 per 1 ms and life time of packet is given 64 s. But i think question is not asking in this scenario . TCP uses Sliding Window Protocol. Here Minimum Permissible rate may be confusing but think like that if life time of packet is given 64s so this is max. Means if we increment seq. no per 64 sec is allowed but more than 64s should not be allowed. If we keep more than 64s for 1 sequence number we need to wait for next sequence without any reason. so ans should be = 1 / 64 s = 0.015 /s
