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For the data link, the logical link control (LLC) sublayer is responsible. The high-speed connection between devices is provided by Layer 2 of your infrastructure.
The logical link control (LLC) data communication protocol layer is the top sublayer of the data link layer (layer 2) of the seven-layer OSI model, which is used as the reference model for computer networking in IEEE 802 standards. The media access control (MAC) sublayer and the network layer are connected by the LLC sublayer.
The LLC sublayer offers multiplexing methods that allow several network protocols, such as IP, IPX, and DECnet, to coexist in a multipoint network and be carried over the same network media. Additionally, it can include mechanisms for automatic repeat request (ARQ) error management and flow control.
The LLC sublayer's main concerns are multiplexing and demultiplexing protocols sent across the MAC layer (when transmitting) (when receiving).
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