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Originally, the term firewall referred to a construction technique designed to prevent the
spread of fire from one room to another. The networking term firewall is a system or group of
systems that enforces an access-control policy between two networks. It may also be
defined as a mechanism used to protect a trusted network from an untrusted network. Of
course, firewalls cannot solve all of the security problems. A firewall is one of the
mechanisms used to establish a network security perimeter in support of a network security
policy. It should never be the only mechanism or method employed. For a firewall to guard
effectively, you must design and deploy it appropriately. This requires integrating the firewall
into a broad information-security policy. In addition, specific policies must be implemented
within the firewall itself.
U10C019/U10C020
