Network firewalls are your client's first line of defense against malware and other network intrusions. If you're planning to set up a network firewall or looking to harden an existing one, this FAQ guide has information that can help. Expert Chris Clements, a security architect with Flat Earth Networking in Nashville, Tenn., addresses all the common questions about network firewalls, and his answers are also available as an MP3 file to download and take with you to your clients' sites.