Introduction to Data Communications
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37. IEEE 802.2 LLC - Logical Link Control Layer

The Logical Link Control Layer resides in the upper portion of the Data Link Layer. The LLC layer performs these functions:

  1. Managing the data-link communication
  2. Link Addressing
  3. Defining Service Access Points (SAPs)
  4. Sequencing

The LLC provides a way for the upper layers to deal with any type of MAC layer (ex. Ethernet - IEEE 802.3 CSMA/CD or Token Ring IEEE 802.5 Token Passing).

The Data field of the MAC layer Frame transmits the LLC Protocol Data Unit.

LLC PDU Format

Introduction to Data Communications
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