Perimeter Router Terms and Concepts

Aug 28,2009 by alperen

Perimeter Router Terms and Concepts

A network, like a city or village, has an area where the network meets the outside world. Unlike a city, this interface is limited to those devices—hopefully routers—that have connections both to the inside of the network and with the outside world. Typically, an ISP is at the other end of that connection, and then the Internet.

In the preceding two chapters, you looked at network access servers (NAS), which also constitute a part of the network boundary. These NAS connections are a little different, in that security technologies like AAA can be set up to limit access to only those remote dial-in users with preestablished login authority. On the other hand, the network boundary, or perimeter, routers often must allow access to persons unknown to the corporate shared resources, such as web and FTP servers. Furthermore, perimeter router connections also provide access for the Internet, which then exposes the network to other risks.

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