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Logical link control
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==Operation== The LLC sublayer is primarily concerned with [[multiplexing]] protocols transmitted over the MAC layer (when transmitting) and demultiplexing them (when receiving). It can also provide node-to-node flow control and error management. The flow control and error management capabilities of the LLC sublayer are used by protocols such as the [[NetBIOS Frames]] protocol. However, most protocol stacks running atop [[802.2]] do not use LLC sublayer flow control and error management. In these cases flow control and error management are taken care of by a [[transport layer]] protocol such as [[Transmission Control Protocol|TCP]] or by some [[application layer]] protocol. These higher layer protocols work in an end-to-end fashion, i.e. re-transmission is done from the original source to the final destination, rather than on individual physical segments. For these protocol stacks only the multiplexing capabilities of the LLC sublayer are used.
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