Part II-7. TCP/IP ROUTING PROTOCOLS (GATEWAY PROTOCOLS)
Routing is not just one of the most important activities that take place at the network layer; it is also the function that really defines layer 3 of the OSI Reference Model. Routing is what enables small local networks to be linked together to form potentially huge internetworks that can span cities, countries, or even the entire globe. The job of routing is done by special devices called routers, which forward datagrams from network to network, allowing any device to send to any other device, even if the source has no idea where the destination is.
Strictly speaking, an argument could be made that some routing protocols don't belong in layer ...
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