Goals and Methods
Three years ago, I realized that there were many certification books to help people pass Cisco security certification exams; however, I found no books of any substance that brought Cisco security features together to be applied in a real-life situation. I continually monitor various Cisco newsgroups and constantly see questions related to how to implement various Cisco security features. This was the foundation of my first security book, Cisco PIX Firewalls.
The purpose of this book, Cisco Router Firewall Security, is to show you how to implement a perimeter firewall solution using Cisco routers. To that end, this book focuses on important features of the Cisco IOS Software, and how to use them to secure your perimeter router and provide a secure solution for traffic entering and leaving the perimeter of your network. Of course, many of the topics I discuss in this book can be applied to any Cisco router in your network; however, because most mid- to large-size networks have a Cisco router on their perimeter, I focus this text on perimeter security problems and how to use a Cisco router to deal with these problems. This is not a certification book, but a "how to" book. I've included the following methods to help you with the "how to" process:
® Providing explanations and information to fill in your knowledge gaps
® Explaining advantages and disadvantages of the various Cisco IOS Software security features, to help you understand when they should be used
• Using small examples from my personal consulting experience to illustrate the issues related to security
® Supplying many examples, including a detailed case study at the end of the book, to show you how Cisco's security features should be implemented
NEttT
Continue reading here: Unstructured and Structured Threats
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