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Logical link control
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====Ethernet ==== Since bit errors are very rare in wired networks, Ethernet does not provide flow control or [[automatic repeat request]] (ARQ), meaning that incorrect packets are detected but only cancelled, not retransmitted (except in case of collisions detected by the [[Carrier-sense multiple access with collision detection|CSMA/CD]] MAC layer protocol). Instead, retransmissions rely on higher-layer protocols. As the [[EtherType]] in an Ethernet frame using [[Ethernet II framing]] is used to multiplex different protocols on top of the Ethernet MAC header it can be seen as an LLC identifier. However, Ethernet frames lacking an EtherType have no LLC identifier in the Ethernet header, and, instead, use an IEEE 802.2 LLC header after the Ethernet header to provide the protocol multiplexing function.
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