Gateways regulate traffic between two dissimilar networks, while routers regulate traffic between similar networks. The easiest way to illustrate this point is through an example. Suppose you have a Windows 2000 network that’s using TCP/IP as its primary protocol. Because TCP/IP is also the primary protocol of the Internet, you could use a router to connect your network to the Internet. The router would ensure that:
· Traffic intended for the local network doesn’t bleed onto the Internet.
· Traffic residing on the Internet that’s not specifically intended for your network stays on the Internet.