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Can someone please explain this to me? Suppose that the Go-Back-N protocol with ? = 3...

Can someone please explain this to me?

Suppose that the Go-Back-N protocol with ? = 3 and the sending window of size 7 is used to send packets. Let ?f = 31 modulo 2m, ?n = 35 modulo 2m, and ?n= 33 modulo 2m.

  1. What are the sequence numbers of data packets in transit?
  2. What are the acknowledgement numbers of ACK packets in transmit?
  3. If the sender’s process sends two more data packets to the sender’s transport layer and one ACK packet is received from the receiver’s transport layer, what are the updated values for ?f and ?n ?
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