“Security Sage’s Guide to Hardening the Network Infrastructure” (HTNI) is mainly a collection of advice given in other security books, packaged with brochure-like commercial product descriptions. Much of the technical defensive recommendations lack the command-level syntax to put that advice into practical use. I can’t recommend HTNI unless your library doesn’t already address essential networking and security techniques, reviewer says. I was excited by the table of contents, but disappointed once I finished the book, he says.”]
Source: https://taosecurity.blogspot.com/2004/06/review-of-security-sages-guide-to.html