Assig3_308.docx - ECSE 308 Assignment 03 Nusaiba Radi...

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ECSE 308 Nusaiba Radi Assignment 03 260672575 A. Problems: 7.2) Define flow control? The sending station must not send frames at a rate faster than the receiving station can absorb them. 7.4) What are reasons for breaking up a long data transmission into a number of frames? Limited size of the buffer receiver. Errors are more likely to occur with long transmission, which requires retransmission of the entire frame. Errors are detected sooner in small frames; hence smaller amount of data needs to be retransmitted. Allowing one station to occupy the medium for long period will cause delays at the other sending stations on a shared medium like LAN. 7. 8) Define error control? Error control refers to mechanisms to detect and correct errors that occur in the transmission of frames. 7.10) Describe automatic repeat request (ARQ)? A feature that automatically initiates a request for retransmission when an error in transmission is detected. The effect of ARQ is to turn a potentially unreliable data link into a reliable one. 7.11) List and briefly define three versions of ARQ? Stop-and-wait ARQ: based on the stop-and-wait flow control technique. The source station transmits a single frame and then must await an acknowledgment (ACK). No other data frames can be sent until the destination station’s reply arrives at the source station. A station retransmits on receipt of a duplicate acknowledgment or as a result of a timeout. Go-Back-N ARQ: based on sliding-window flow control. In this method, a station may send a series of frames sequentially. The number of unacknowledged frames outstanding is determined by window size. When an error is detected, the frame
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in question is retransmitted, as well as all subsequent frames that have been previously transmitted.
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