A demilitarized zone involves setting up two firewalls: an outer and an inner firewall.
A demilitarized zone (DMZ) is a security network which protects the internal network from unwanted external interventions into the network. It uses two firewalls for this purpose. One is an outer or front-end firewall which allows traffic destined for DMZ only. The other one is an inner or back-end firewall which allows only the traffic from DMZ into the internal network.
In short, a demilitarized zone isolates the private network from the untrusted external networks. Using two firewalls benefits the user with protection from external malware as well as that present in the computers.
In the War of 1812, caused by British restrictions on U.S. trade and America’s desire to expand its territory, the United States took on the greatest naval power in the world, Great Britain
