The Data Link Layer

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The Data Link Layer

The second layer is the Data Link layer. This layer is responsible for the creation and interpretation of different frame types based on the actual physical network being used. For instance, ethernet and token-ring networks support different and numerous frame types, and the Data Link layer must understand the difference between them. This layer is also responsible for interpreting what it receives from the Physical layer, using low-level error detection and correction algorithms to determine when information needs to be re-sent. Network protocols, including the TCP/IP protocol suite, do not define physical standards at the physical or Data Link layer, but instead are written to make use of any standards that may currently be in use. The boundary layer in between the Data Link layer and Network layer defines a group of agreed-upon standards for how protocols communicate and gain access to these lower layers. As long as a network protocol is appropriately written to this boundary layer, the protocols should be able to access the network, regardless of what media type is being used.

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