PIX Firewall has a comprehensive suite of features that allow it to perform basic firewall functions with speed. It also has an array of advanced features that can be used to take care of specific network situations and various types of attacks. This chapter built on the basic discussion of firewalls from the preceding chapter and constructed the framework under which the PIX Firewall works. It is interesting to note that most of the more complicated implementations of the PIX seen in the field are various permutations of the use of some of the advanced features found in the PIX. Because the PIX Firewall forms the basis of any secure Cisco network security architecture, a thorough understanding of the topics in this chapter is crucial to understanding the various other techniques discussed in the other chapters.

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