Functions of Data Link Layer

Functions of Data Link Layer

Functions of Data Link Layer

   It accepts a data unit (segment ) from the network layer and adds meaningful bit to the beginning  (header ) and end (trailer ).

   The header contains physical address of the source and destination.

   Trailer contains extra bits for error controlling.

   The data link layer divide the stream of bits ( segments ) received from network layer into manageable data units called frames.

   Then the header and trailer are added with header contains the physical address of sender / receiver and the trailer contains error control information.

    Data link layer controls link to link delivery of packets.

    Example for devices working in this layer are switch , bridge.