Thankfully, though, people go not just show how to set up a personal firewall turnkey product - too many Dummies books explain the obvious and generally intuitive - and reveal how to set the kind of firewall that protects a network that is large enough. Moreover, this book provides a serious explanation of corporate firewall products and techniques that are appropriate for people who build and maintain large systems. The authors generally avoid shows how to configure certain firewall products, though some biggies - Microsoft Internet Security and Acceleration Server, BlackICE, ZoneAlarm, and Check Point FireWall-1 - get a comparative picture of the scope of the Wall. - David Topics covered: Firewall and how they can be used to prevent unauthorized access to computer and network without disturbing the protected 'users the ability to get out to the Internet. Summary of fundamental network as applied to the firewall followed by coverage of network address translation (NAT), demilitarized zones (DMZs) which was created by a few or even a single computer, and policy filtering.