Data Link L aye r Addresses

Adata link layer address uniquely identifies each physical network connection of a network device. Dat a-link addresses sometimes are referred to as physical or hardware addresses. Datalink add res ses usually exist within a flat address space and have a pre-established and typically fixed relationship to a specific device.

End systems generally have only one physical network connection and thus have only one datalink address. Routers and other internetworking devices typically have multiple physical network connections and therefore have multiple data-link addresses. Figure 1-13 illustrates how each interface on a device is uniquely identified by a data-link address.

Figure 1-13. Each Interface on a Device Is Uniquely Identified by a

Data-Link Address.

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Figure 1-13. Each Interface on a Device Is Uniquely Identified by a

Data-Link Address.

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