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From Tony Bradley, CISSP-ISSAP, for About.com

What Is A Firewall?

Wednesday November 26, 2003
This is perhaps the most read article I have written for this site. I have converted it to our newer format and made some minor tweaks. This article introduces some of the basic concepts of how a firewall works, what the different types of firewall technologies are and some of the pros and cons of the different firewall types. Article: What Is A Firewall?.
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