Boundary protection device

A boundary protection device is "[a] device with appropriate mechanisms that: (i) facilitates the adjudication of different interconnected system security policies (e.g., controlling the flow of information into or out of an interconnected system); and/or (ii) monitors and controls communications at the external boundary of an information system to prevent and detect malicious and other unauthorized communications. Boundary protection devices include such components as proxies, gateways, routers, firewalls, guards, and encrypted tunnels.