[W/K] :: data link layer

  data link layer
       
           Layer two, the second lowest layer in the OSI
          seven layer model.  The data link layer 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 network layer.
          The data link 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.
       
          (1995-02-14)