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Layer 2
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... performance bridges, which make their main forwarding decisions
based on Layer 2 (MAC) address information. Even so, they rarely
...
... Layer 3 (IP) address structure. Pure Layer 2
switching has a "flat" address space that will need to be renumbered
...
... IP
subnets.
Increasingly, internetworking products are not purely Layer 2 or
Layer 3 devices. A workgroup switch ...
... router
function, so the numbering plan must support both flat Layer 2 and
hierarchical Layer 3 addresses ...