Logical Link Control (LLC) is one of two Data Link Layer (DLL) network protocol sublayers within the Open System Interconnection (OSI) data communication model. LLC is located in the upper DLL area of OSI Layer 2 above the Physical Layer (PHY) of OSI Layer 1.
- Multipoint network operation
- The unified network media exchange
- Flow control
- Line protocol identification, like Synchronous Data Link Control (SDLC)
- Frame sequence number assignment
- Acknowledgment tracking
The LLC multiplexing interface includes the following network protocol features:
Today, LLC is only used for its multiplexing feature. Modern Transport Layer protocols, like TCP or other application layer protocols, are used for source and destination network flow management.
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