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In Stop-and-Wait ARQ, we use sequence numbers to number the frames. The sequence numbers are based on __________arithmetic.

the answer is - >modulo 2 arithmetic.

can someone explain how did we find out the modulo arithmetic ?

and similarly , what will be the answer for SR and GBN protocols..?
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For any flow control no of sequence numbers >=(window size of receiver +window size of sender)

for Stop and wait ARQ ws=1 and wr=1 so no of  sequence numbers =2  let's suppose {0,1}. So we use modulo 2 arithmetic

and for GBN it is  modulo N+1 and for SR it is modulo 2N..
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