Chapter 9. Firewalls

On completing this chapter, you will be able to

  • Explain the basics of firewalls

  • Describe the different types of firewalls

  • Describe some firewall enhancements

  • Explain firewall placement in a network

This chapter covers a variety of types of firewalls, including devices such as PIX, software solutions such as Check Point, and personal firewalls. The chapter defines firewalls and explores their purpose and use in today's large-scale IP-based networks, where attacks can occur from within and from external sources.

Protecting the confidentiality of information, preventing unauthorized access, and defending against external and internal attacks remain primary concerns of all network managers today. IT departments must defend against these ...

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