Firewalls: Jumpstart for Network and Systems Administrators

Section II: Firewall Topologies

Chapter List

Chapter 4: Choosing the Right Firewall
Chapter 5: Defense in Depth: Firewall Topologies

4.1 Chapter Objectives

  • Methods of hacking

  • Secure content management

  • Understanding the avenues of attack

  • Adapting to change

  • Firewall product reviews

As the topology and threatscape of modern networks becomes increasingly complex, enterprise and administrative resources have become stretched ever thinner. Corporations and businesses are increasingly reliant on both the internal resources of the network as well as on external communications for day-to-day business functions. More and more of these functions are relegated to automation, with things like faxing, scanning, and document management integrating with network resources. Networks have truly emerged in this century as the cornerstone, if not the foundation, of critical business operations.

When the Internet is down, when the server is down, if faxing is offline, or if the network copier is on the blink, business literally grinds to a halt. And, typically, the reason that these things happen is because malicious software has wormed its way into the network, somewhere, somehow. There are many avenues of intrusion, and there are many things that can ostensibly be implemented to fortify against such occurrences. But implementing all of them, and then maintaining patches, product updates, definitions, etc., for a slew of devices and products is not at the top of any network administrator s list of favorite things to be doing. The most rewarding and creative part of a network administrator s job is to introduce and manage...

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