Many people know how to disrupt information systems.
Across the nation, the NII is comprised of all the interconnected information systems and all of the interconnection mechanisms used to make those connections work. Our nation depends on the National Information Infrastructure and a disruption of this interconnection would be devastating to the nation as a whole. Firewalls, also known as secure gateways, provide protection and security against invaders. A firewall filters access between two networks. The two networks are usually comprised of a private network and a more public network.