THE OTHER BRIDGE LAYERS
The IEEE internetworking entity is positioned at the MAC layer. As shown in Figure 4-2, the relay entity is designated as a bridge. In this example, the MAC service user is LLC and the MAC service provider is (a) MAC and (b) the MAC relay entity.
Figure 4-2. The MAC Relay Entity
Traffic transported across a MAC bridge need only access the MAC layer. Except for certain network management functions, the operation does not require the invocation of any protocol above MAC.
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