Chapter 7. Firewalls
“Courage is resistance to fear, mastery of fear—not absence of fear.”
—Mark Twain
By the end of this chapter, you should know and be able to explain the following:
• Who needs a firewall, and why firewalls are used to protect network resources
• How a firewall is a technological expression of your organization’s written security policy
• When a DMZ is appropriate and the security benefits you gain by deploying a firewall with a DMZ
Answering these key questions enables you to understand the overall characteristics and importance of network security. By the time you finish this book, you will have a solid appreciation a firewall’s role, its issues, how it works, and why it is so important to the security of your network.
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