The firewall appliance is a security tool that, when configured correctly, filters traffic between trusted and non-trusted network zones. A firewall allows or blocks network traffic between the trusted and the non-trusted zone based on policies defined by the firewall administrator. 

The firewall operating system must be maintained at the latest release and patch level to address security vulnerabilities.

ATC helps businesses use firewalls effectively as part of a total network security strategy by providing:
The right firewall for the customer’s needs and requirements
Initial configuration and deployment of the firewall appliance
Ongoing management of the firewall including operating system updates
Firewall monitoring as part of intrusion detection services
Reconfiguration of the firewall appliance as needed to give network access to software vendors and other partners
Integration of the firewall into a comprehensive approach to network security