<networking> Layer two, the second lowest layer in the ISO seven layer model. It splits data into frames (see fragmentation) for sending on the physical layer and receives acknowledgement frames. It performs error checking and re-transmits frames not received correctly. It provides an error-free virtual channel to the the network layer. The datalink layer is split into an upper sublayer, Logical Link Control (LLC), and a lower sublayer, Media Access Control (MAC).
Example protocols at this layer are ABP, Go Back N, SRP.
(14 Feb 1995)