?– Media Access Management This includes any collision avoidance and handling
when a shared medium is used (i.e., multiple entities are using the same physical
medium to communicate; see section on CDMA later in the chapter for more
detail).
An optional MAC Control sublayer, architecturally positioned between the Logical
Link Control (LLC) or the MAC sublayer, may also be present (and is transparent
to both the MAC and the LLC).
?– MAC Control Sublayer Initiates the transmission of the frames and the recovery
from any transmission errors employing an algorithm such as CSMA/CD over a
shared medium (see the next section for more detail)
Logical Link Control (LLC) sublayer This sublayer corresponds to the upper part of
the OSI Data-Link layer and provides the interface between the Ethernet MAC and the
upper layers of the device/application. The LLC sublayer is primarily concerned with
multiplexing and demultiplexing of frames transported over the MAC sublayer and
also provides flow control, acknowledgement, and recovery, if necessary.
8 If the frame is too large, for instance; see next section on framing for more detail
Figure 1.
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