It is a project started by IEEE to set standards to enable
intercommunication between equipment from a variety of manufacturers. It is a
way for specifying functions of the physical layer, the data link layer and to
some extent the network layer to allow for interconnectivity of major LAN
protocols.
It consists of the following:
Ø 802.1 is an internetworking standard for compatibility of different
LANs and MANs across protocols.
Ø 802.2 Logical link control (LLC) is the upper sublayer of the data
link layer which is non-architecture-specific, that is remains the same for all
IEEE-defined LANs.
Ø Media access control (MAC) is the lower sublayer of the data link
layer that contains some distinct modules each carrying proprietary information
specific to the LAN product being used. The modules are Ethernet LAN (802.3),
Token ring LAN (802.4), Token bus LAN (802.5).
Ø 802.6 is distributed queue dual bus (DQDB) designed to be used in
MANs.
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