In gobackn ARQ the frames 45 and 6 are received successfully

In go-back-n ARQ the frames 4,5, and 6 are received successfully, the receiver may send how many ACKs to the sender?

Solution

go-back-N ARQ is protocol whose full form is Automatic Repeat Request . For every recieved frame it sends an acknowledgement. And also it keeps tracking of the next frame and processess the ACK.

So before receiving 4 it sends the ACK and similarly for 5 and 6 also . Till then it sends 3 ACKNOWLEDGMENTS and when it receives 6 it sends an ACK for the next frame also.

The ACK is 7 and the number of acknowledgements it sends is 4.