Chapter 2

Protecting Your Perimeter

Introduction

When it comes to securing networks, the first items that come to mind are firewalls, which are the primary gatekeepers between an organization’s internal network and the outside world. While a properly implemented firewall can be one of the most effective security tools in your arsenal, it shouldn’t be the only tool. The adage “defense-in-depth” means that you should have multiple layers of security. Using a defense-in-depth configuration, if one component of your defense failed or was defeated, there would still be a variety ...

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