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Concise explanations of key technical topics found on Cisco's® CCNA™, CCNP™, and CCIE™ exams
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Author: Katherine Tallis

Focus: CCIE R&S; & CCIE Security

Issue Date: Aug 1, 2023

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Firewalls

The Tutorial portion of this Study Guide begins with a very brief overview of what a firewall is and the general functions available in most common firewalls. It then discusses firewall features available in the current (12.x) releases of IOS, gives some general guidelines for "hardening" a router so that it can act as a firewall, and examines the four major IOS enhancements that make up Cisco's Secure Integrated Software (formerly called the "IOS Firewall Feature Set"). The Tutorial concludes with an examination of the features of the PIX, Cisco's dedicated firewall.

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