The Data Link Layer

The data link layer provides reliable transport across a physical link. The link layer has its own addressing scheme. This addressing scheme is concerned with physical connectivity and can transport frames based upon the data link layer address.

Traditional Ethernet switches switch network traffic based upon the data link layer (Layer 2) address. Switching traffic based on a Layer 2 address is generally known as bridging. In fact, an Ethernet switch is nothing more than a high-speed bridge with multiple interfaces.

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