This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment. ![]() The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking. Layer 2 of the OSI Model (Data Link Layer) is the layer of the ISO Open Systems Interconnection (OSI) model provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the physical layer. ![]() (Protocol Data Units) Layer 2 PDU is frame. Routers use IP addresses to route the packets. ![]() (unless it is a layer 3 switch, but disregard that for now.) and it uses MAC addressing to switch the frames. For example, a switch is a layer 2 device.
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