All publications are reviewed from the perspective of working online information professionals, which may cause higher or lower ratings than might be perceived as appropriate in the general press. Building Internet Firewalls by D. Brent Chapman and Elizabeth D. Zwicky. As a consultant, I am saddened to find so many otherwise competent information professionals who are not using the Internet in their companies because they are afraid of security breaches. Just as you can't guarantee that your company won't be hit by terrorist bombers, you can't be sure your company will be totally risk free. You can take reasonable precautions to reduce the risk.
Firewalls are important security tools.
Most importantly, when damage does occur, firewalls can keep it from spreading to other parts of the network. It's honest about what firewalls can and can't do. I highly recommend it for systems administrators and managers dealing with security issues in their organizations. The Complete PC Upgrade and Maintenance Guide by Mark Minasi. This is the most complete guide to PC maintenance on the market today.