Part I starts with a solid overview of troubleshooting tools and methodologies.
In Part II, the author explains the features of Cisco ASA and Cisco PIX® version 7.0 security platforms, Firewall Services Module (FWSM), and Cisco IOS® firewalls.
The Internet connection is typically an Ethernet hand-off which terminates to a low-end firewall.
Both the router and the firewall are then typically interfaced with the internal LAN through one or more layer three switches running an IGP.
BGP) but few security mechanisms given that it merely extends a private network.
Conversely, the Internet connection requires strong policy enforcement but no dynamic routing; a default route toward the Internet generally suffices.
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This removes the requirement for a standalone firewall and the layer three switch, as one device performs all routing for the site.
To support security policy enforcement, we'll use Cisco IOS' zone-based firewall feature.
Cisco Network Security Troubleshooting Handbook can single-handedly help you analyze current and potential network security problems and identify viable solutions, detailing each step until you reach the best resolution.
Through its modular design, the book allows you to move between chapters and sections to find just the information you need.
A connection into the internal network, however, would be assigned to a separate, trusted zone.