Connecting the Network to the Computers

Modems are used to connect separate sites via the telephone network.
The modem fulfils the function of a Network Interface Card and transmits and receives data. An employee away from his site, on business for example, would be able to attach his laptop to his network via a modem and a telephone socket.

A fileserver may have an NIC for connection to other computers within the site and also a modem to connect to other servers within the WAN. Alternatively the modem on a server may be used for an employee to connect into the network when he is out on business.