Refer to the following sections for information about these topics:
• 1-1: Overview of Firewall Operation—Discusses the mechanisms a Cisco firewall uses to inspect and control traffic passing through it. The firewall inspection engines and algorithms are responsible for enforcing any security policies configured into the firewall.
• 1-2: Inspection Engines for ICMP, UDP, and TCP—Describes how a firewall reacts to traffic of different IP protocols. The inspection mechanisms for the ICMP, UDP, and TCP protocols are covered.
• 1-3: Hardware and Performance—Provides an overview and comparison of the various Cisco firewall platforms and their specifications. This information can help you decide which firewall model is ...