Part three is chapter fourteen, which lists firewall vendors and products. Descriptions of the products are extensive, and sometimes technically detailed, but it is difficult to call them evaluations, since there is little analysis of strengths and weaknesses. It is also hard to make comparisons, since there is little similarity of format in the entries. Appendix A is a collection of vendor contact information. Goncalves' writing on any given section is quite readable.
Explanations are clear and illustrations can even be amusing.
At times it seemed that the material was moving into common traps and misconceptions, but ultimately the analysis is generally balanced and realistic. However, in some cases there is an apparent contradiction between one paragraph and the next. The incongruity disappears on more rigorous scrutiny, but the text can be startling. In addition, the structure of the book, both overall and within individual chapters, leaves something to be desired. It can be difficult to follow developing concepts, and also to use the book as a reference by going back to specific topics to pick up particular points.