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Four bits are used for packet sequence numbering in a sliding window protocol used in a computer network. What is the maximum window size?
(a) 4

(b) 15
(c) 8

(d) 16.

3 Answers

Best answer
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15 is the maximum windows size for 4 bit sequences and it will happen in Go back N.
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Incase of GoBackN protocol

Sender window size is n-1

and Receiver window size is 1

the size is (2^n)-1

the answer is 15
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In the stop and wait sender windows size and receiver windows size is only=1

In the Go back N ARG sender windows size and size is only=2^n-1 and receiver windows =1

In selective Repeat ARG windows size and Reciever Size =2^n-1 

So that maximum windows size is possible in only Go back ARG only =2^4-1= 15 

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