Combines descriptive summaries of the leading firewall products with an accessible introduction to firewall technology and its application to internetwork security. The first part describes firewall design, testing and policy. Current technologies are explained in the context of both Internet and Intranet deployment. The second part consists of extensive descriptions of the leading product offerings arranged in a standardized format and delivered in full color hypertext on a CD-ROM, together with numerous supporting documents in Adobe Acrobat format.