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Consider a scenario of GO-BACK-4 protocol with 10 bits sequence numbers. Assume that s is the sequence number of subsequent packet at time t0, Then what can be the possible range of window size at sender. Note: medium does not change the order of packets.

  1.   [s,s+3]
  2.   [s-9, s-1]
  3.   [s-4, s-9]
  4.   [s-4,s]

1 Answer

Best answer
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Window Size is 4.

So, only A fits here.

1. [s, s+3] => (s, s+1, s+2, s+3)

2. [s-9, s-1] => contains 9 packets

3. [s-4, s-9] => contains 6 packets

4. [s-4, s] => (s-4, s-3, s-2, s-1, s)

So option A is the correct answer.
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