Answer / sarwat

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.)

Answer / tapul k

Initially 802.3 doesn't support multiple upper layer protocol
e.g. IP,IPx,AppleTalk etc. But as need arise to support
multiple upper layer protocol, Ethernets L2(Data Link)
broken into Two Parts....<1> LLC <2> MAC
<1> LLC introduced a additional field in ethernet frame to
distinguished between multiple upper layer protocol
802.3 uses S_SAP and D_SAP to identify multiple upper layer
protocol.

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