Firewall is a tool that helps you do this by controlling access to and from your network. This book teaches the basics of network operation and how firewalls are united. It is important to understand the risks, and this book helps explain risk management and how it impacts security policy. Basic technology and security requirements that fit together to form a firewall is introduced, along with the security policy authors' "perfect firewall." A large part of this book were taken with a comparative review of most major firewall products freeware and currently available commercially. This is a useful tool that gives you everything you might need when deciding how to choose a firewall for your network. A firewall is a very practical book intended for experienced network administrators who may be unfamiliar with Internet security.