This means interconnecting different computers via a TCP/IP compatible network. Usually you need this to transfert data from one PC to another, share ressources, like disk drivers, printers, internet connection or any other.
Although I decided to not do a specialisation in networking and telecommunication (but in software developpment), I know a lot about networks. I am able to establish and configure a network and all the components that go with such an operation, like routers, switches, ...
Hint: Did you ever try the IpCop software router? It's really easy to use and very powerful.