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IEEE 802.2
The IEEE 802.2 standard defines an LLC sublayer that is used by other lower-layer protocols. Because these lower-layer protocols can use a single LLC protocol layer, Network layer protocols can be designed independently of both the network’s Physical layer and MAC sublayer implementations.

The LLC appends to packets a header that identifies the upper-layer protocols associated with the frame. This header also declares the processes that are the source and destination of each packet.