It provides multiplexing, data fragmentation, error checking, link control, prioritization, and layer 2 addressing services for user data.
2.
Just as compaction can eliminate external fragmentation, data fragmentation can be eliminated by rearranging data storage so that related pieces are close together.
3.
There are three different but related forms of fragmentation : external fragmentation, internal fragmentation, and data fragmentation, which can be present in isolation or conjunction.
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