[ Thanks to Andrew
Weber for this link. ]
“This image represents a basic network plan for a small
company. The goal of this article is to use this image to help
describe basic concepts of networks and how they typically
constructed as well as why they are designed the way they are. Of
course there are many variations to this basic design. Many times
the variations depend upon the needs of the company as well as the
skills of those who work for the company.“Gateway
“The Gateway connects two dissimilar networks. In this example
the Gateway connects the Internet to the LAN and the DMZ which are
both on different networks. The Gateway, as is often the case, also
performs another function in that it acts as a firewall. The
firewall is doing both Nat (Network Address Translation) to the LAN
and port forwarding to the DMZ. Note that the DMZ is on a different
network from the LAN.”