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Layer 2 of the OSI reference model. Provides reliable transit
of data across a physical link. The data-link layer is concerned with physical
addressing, network topology, line discipline, error notification, ordered
delivery of frames, and flow control. The IEEE divided this layer into two
sublayers: the MAC sublayer and the LLC sublayer. Sometimes simply called link
layer. Roughly corresponds to the data-link control layer of the SNA model. See
also application layer, LLC, MAC, network layer,
physical layer, PQ, session layer, and transport
layer.
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