Cisco Secure Internet Security Solutions is straight from Cisco’s course sheets. It goes over the basic Internet attacks and explains DoS, SYN floods, SNMP problems. The next few chapters go into some detail about the Cisco secure product family. But the software is complex and the book offers no demo or sample software to experiment with. The book has two major flaws: In the end it’s still mostly regurgitated Cisco documentation and doesn’t offer a whole lot of real-world experience for the reader to use.”]
Source: https://www.amazon.co.uk/exec/obidos/ASIN/1587050161/helpnetsecuri-21