Layer 3 refers to the Network layer of
the commonly-referenced multilayered communication model, Open Systems Interconnection (OSI). The
Network layer is concerned with knowing the address of the neighboring nodes in the network,
selecting routes and quality of service, and recognizing and forwarding to the Transport layer
incoming messages for local host domains.
A router
is a layer 3 device, although some newer switches also
perform layer 3 functions. The Internet Protocol (IP) address is a layer 3 address.
This was last updated in May 2000
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