Thursday, 14 November 2013

The data link layer used the raw transmission facility and transforms it to an apparently error free facility tobe used inserting appropriate frame boundary, transmit the frames sequentially and process the acknowledgment sent back by the receiving computer. 
If a frame is completely destroyed by noise burst, it is the duty of data link layer to transmit it from the source machine data link layer also ensures that a fast sender be not allowed to swamp a slow receiver. This is called flow control. In a broadcast network it is the duty of MAC sub-layer of data link layer to decide who will access the transmission medium at a particular time.

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