Question

Sliding window protocol with window size of 7 frames are used between the data link layers of machines A and B. Assume that machine B sends an ACK (acknowledgement) for every frame it receives without error, and it sends a NAK (negative acknowledgement) for every frame it receives with error. This corresponds to a receiver window size of 1 frame. Assume also that no frames are lost in the transmission medium. For the scenario shown in the figure on the right hand side, write the numbers of the data frames indicated by a, b, e, d, e, f, g, and write the numbers of the ACKs indicated by h, i, j, k, I, m, n, and also explain what kind of process does the receiver perform on the frames indicated by p for each of the following cases: a) For the Go-back-N method. 16 marksl b) For the Selective Repeat AQR method. 16 marks] F2 ACK 2 NAK 2 F5 IACKI m (Ack

please answer the question clearly.

Answer 1

r Go-back-N Automaric For R Packer sends re1ative ACK Se, Go -back-N pnotocol uil Send fiames fvom F2 aqain Frames a: F2 b: F3 c: F4 Ackrowledqments sent d, e Fe :Fヰ Aqai) pDiscarded b) For -the Selective Reiect Automatic Repeat_ Resiet * Receiver'B ll serd Negative ack '2 to ' for frame a a: FR b F4 rames d: FI e: F2 m, Аску Cs Scanned amScanrle

p saved in the buer memor and puf into order AcK 2, 3, ,5,G may not be sent 2,3, u, 5,6 no be Sent CS Scanned with CamScanner