The main task of the data link layer is to provide error free transmission. It accomplishes this task by having the sender configure the input data into data frames, transmit the frames sequentially, between network devices and process the acknowledgement frames sent back by the intermediate receiver.
The data link layer creates and recognizes frame boundaries. This can be accomplished by attaching special bit patterns to the beginning and end of the frame. Since these bit patterns can accidentally occur in the data, special care must be taken to make sure these patterns are not incorrectly interpreted as frame boundaries.
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