While i was reading up on how to properly configure Outpost, i ran into a really great site that goes into Firewalls and Networking among other things.

I'll just list verbatim what's on their first two menus: Firewalls and Networking.

Firewall:

*Introduction
*Firewall topologies
*DMZ zones
*Network Address Translation>
*Dos & DDoS
*Locking Win9x

Networking:

*General >
*Cabling >
*Protocols >
*The OSI Model >
*Routing >
*Connectivity >
*Routers >
*Ethernet >
* Fast Ethernet >

Obviously the ones with arrows beside them have drop down menus with more detailed information about the specific topic.

They also have a great download section for windows patches aswell as tools such as sniffers and scanners.

Here is the link: Firewall.cx