The 2100 CF is a dedicated content filtering appliance. It has three Fast Ethernet ports – two sit transparently inline with your internet, the third is a dedicated management port.
Fortinet's FortiGate-800 is the company's mid-range firewall. It uses FortiOS 3.0 (this is a correction from the incorrect v2.5 printed in the original article) and comes with antivirus and intrusion prevention as standard, both regularly updated.