Consider stop-and-wait ARQ. With no errors, the utilization is1/(1+2a). 1) Under

Question

Consider stop-and-wait ARQ. With no errors, the utilization is1/(1+2a). 1) Under what kind of circumstances, the sliding windowprotocol will be corresponding to the stop-and-wait protocol. 2) Under what kind of circumstances, the sliding window willhave better utilization than stop-and-wait ARQ. can you please send me the complete answer as i need toexplain to the students. thanks in advance Consider stop-and-wait ARQ. With no errors, the utilization is1/(1+2a). 1) Under what kind of circumstances, the sliding windowprotocol will be corresponding to the stop-and-wait protocol. 2) Under what kind of circumstances, the sliding window willhave better utilization than stop-and-wait ARQ. can you please send me the complete answer as i need toexplain to the students. thanks in advance

Explanation / Answer

Dear,    In Stop-and-Wait ARQ, the sender sends aframe and awaits until it receives the acknowledgement from thereceiver.    1) In sliding window protocol, both senderand the receiver maintains sliding windows, with the sequencenumbers. The sender sends a frame and after the receiver receives,it sends the acknowledgement to the sender. The sender sendsanothre frame. This process some what correspond to Stop-and-waitARQ, because in both the protocols the sender awaits until itreceives the acknowledgement. In this way the sliding windowcorresponds to stop-and-wait ARQ.    2) The Major Drawback of Stop-and-Waitprotocol is, it can transmit only one frame at atime. This leads to inefficiency if propagation delay is much longer than thetransmission delay       This can be over come byusing the sliding window, because          Itallows transmission of multiple frames        Assigns each framea k-bit sequence number         Range of sequencenumber is [0..2k-1], i.e., frames are counted modulo2k        Thus, Sliding windowis better than stop-and wait protocol, because it overcomes thedefects in stop-and-wait " I hope this will help you" " I hope this will help you"

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