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Line 18: # Go to step 1. If a frame or ACK is lost during transmission then it has to be transmitted again by sender. This re-~~trajsjzjsjzjzknsmission~~transmission process is known as ARQ (automatic repeat request). The problem with Stop-and wait is that only one frame can be transmitted at a time, and that often leads to inefficient transmission, ~~behdjxjxjxjchfurjxjjxjjskskkwishdhdcause~~because until the sender receives the ACK it cannot transmit any new packet. During this time both the sender and the channel are unutilised. === Pros and cons of stop and wait ===

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