Most people are now familiar with the concept of firewalls and the levels of security that they provide, whether they are personal desktop software firewalls such as ZoneAlarm or larger enterprise level firewalls like the Watchguard Fireboxes. A firewall is designed to block traffic both outbound and more importantly inbound on a range of IP addresses and/or computer ports. This gives the administrator extreme levels of control over the data that is potentially publicly available from any given system behind the firewall. There is also an area within a LAN or firewall that is classified as a demilitarized zone (DMZ). The DMZ is an unsecured area used for the company's publicly accessible services such as Web and e-mail servers.
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