Firewalls
A firewall can be used to protect a private local network or your entire network from unauthorized access. A properly configured firewall helps keep your data secure. Due to the nature of firewall technology and unique network configurations, it cannot be configured in a uniform way for all installations. As a result, every private network should research the topic of firewalls and network security to find a personalized solution that best fits their needs.
For more information refer to Hosting Forms In A Perimeter Network (DMZ)