What Is Data Link Layer?
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Data Link Layer is the second layer of the seven–layer Open Systems Interconnection (OSI) model. It is responsible for organizing data into frames, providing physical addressing (such as MAC address), and communicating with the physical layer in order to transmit the frames. The data link layer ensures that packets are delivered to the correct node on a local area network (LAN), and handles flow control, error correction and security. At the data link layer, messages may be transmitted directly from one node to another or through a series of intermediate nodes on the network.