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802.3: CSMA/CD (Ethernet). 802.4: Token bus. 802.5: Token ring. An abstraction layer (the LLC, or 802.2) would smooth over the differences for the protocols trying to use the active MAC.
802.3 - CSMA/CD (carrier sense multiple access with collision detection) LAN, derived from Ethernet 802.4 - Token Bus LAN 802.5 - 4 MB and 16 MB Token Ring LAN The details for these and other MAC ...