- noun (written as data link layer)the second layer in the ISO/OSI defined network that sends packets of data to the next link and deals with error correction
- Within the OSI Reference Model for the implementation of communications protocols, the second lowest level, located directly above the physical layer. This layer takes care of functions such as the coding, addressing, and transmission of information between nodes. IEEE 802 standards divide the data link layer into the Logical Link Control sublayer, and the Media Access Control Sublayer. Also called layer 2.