In the JRSS stack, a firewall divides the Agency and Base tiers, acting as a security barrier enforcing rules between external and internal networks.
In reference to the JRSS (Joint Regional Security Stacks) stack, the device that essentially divides the Agency and Base tiers of the stack into their respective halves is known as a firewall. The JRSS stack is a suite of equipment that provides network security services to support the Department of Defense's Joint Information Environment. Its design includes several layers of security to protect and monitor information moving across military networks. Within the JRSS architecture, the firewall acts as a barrier between the untrusted external networks and the trusted internal networks, enforcing security policies through an established set of rules.