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Question
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 64 s.
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?
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 64 s.
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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Solution
The correct option is C 0.064/s
Maximum packet lifetime= 64 seconds
Sequence of one packet change after 64 sec
(otherwise packet duplication possible) and clock counter increment per millisec. therefore min.
possible rate = 0.064/sec.
Maximum packet lifetime= 64 seconds
Sequence of one packet change after 64 sec
(otherwise packet duplication possible) and clock counter increment per millisec. therefore min.
possible rate = 0.064/sec.
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