Data link layer iz divided mac layer and LLC layer.

This LLC LAYER is form for NOVELL AND IPX protocol.

For ip protocol we ve SRC ADDRESS and DEST ADDR(for

communication),but wen we uses IPX/NOVELL protocol the

frame include 1 more byte named "don know"(through which

communication happens @ 2nd layer)....(inshort to

communicate wid IP and IPX/NOVELL we form LLC layer.)