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This above diagram shows the Ethernet architecture, LLC sub-layer and MAC sub-layer, which
respond to the Data Link layer, and transceivers, which respond to the Physical layer in OSI model. In
this section, we are mainly describing the MAC sub-layer.
Logical Link Control (LLC)
Data link layer is composed of both the sub-layers of MAC and MAC-client. Here, the MAC client
may be logical link control or bridge relay entity.
Logical link control supports the interface between the Ethernet MAC and upper layers in the
protocol stack, usually the Network layer, which is nothing to do with the nature of the LAN. So it can
operate over other different LAN technology such as Token Ring, FDDI and so on. Likewise, for the
interface to the MAC layer, LLC defines the services with the interface independent of the medium access
technology and with some of the nature of the medium itself.
Coaxial/STP/UTP
IEEE 802.2 LLC
IEEE802.3 CSMA/CD MAC
IEEE 802.3 PLS
ANSI X3T9.5 PMD
CS
IEEE 802.3
MAU
Physical
Layer
Data
Link
Layer
MII
Fiber
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