Summary

This chapter introduced some of the basics of network security. Starting with a brief description of some of the most common forms of attacks, it quickly moved on to a description of common network devices.

Security provided by the TCP/IP protocol set was discussed, delving into the format of the more common protocols. Understanding the format and use of each of the fields within a protocol is necessary for the administrator to thwart attacks successfully. The chapter examined a few of the more common forms of DoS attacks. Specific examples of how to deal with each of these types of attacks will be shown in later chapters.

In this book, the focus of how to deal with and prevent attacks is on solutions provided by Cisco Secure.

Finally, the chapter covered the need for and requirements of a corporate security policy. The remaining chapters of this book will build on the foundations within this chapter.