Data-link frames, as these protocol data units are called, do not cross the boundaries of a local area network.
The data link layer is concerned with local delivery of frames between nodes on the same level of the network. The data link layer provides the functional and procedural means to transfer data between network entities and may also provide the means to detect and possibly correct errors that can occur in the physical layer. This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking.
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