OSI Model

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Data-Link Layer

The data-link layer provides error-free transfer of data frames from one computer to another over the physical layer. The layers above this layer can assume virtually error-free transmission over the network.

The data-link layer provides the following functions:


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Note

While the services of the data-link layer provide for reliable delivery of data, many routable protocol suites such as TCP/IP and IPX/SPX do not provide for, nor utilize reliable data-link layer delivery services. Instead, reliable data delivery is provided by protocols operating at the transport layer.

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