3.0 Definition and Concept
(1) Data Link Layer
Definition: (No ISO Definition)
Purpose:
The data link layer provides the functional and procedural means totransfer
databetween network entities and might provide the means to detect and
possibly correcterrorsthat may occur in the physical layer, especially to
transfers databetween adjacent network nodesin a wide area network or
between nodeson the same local area network segment.
Originally, this layer was intended forpoint-to-pointandpoint-to-multipointmedia,
characteristic of wide area mediain the telephone system
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