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A Selective Repeat ARQ is using 7 bits to represent the sequence numbers.The maximum window size is __________.

(ans is 64)

why It is  

in Computer Networks
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because in SR protocol both sender window size and receiver window size must be equal.

  • Sender’s Windows ( Ws) = Receiver’s Windows ( Wr).
  • so maximum window size possible in SR =$2^n/2$  =    
  • but in GBN sender window =n  and receiver window always 1 
  • so in Maximum sequence number possible in GBN= $2^n-1$