182 WebSphere Application Server V8.5 Concepts, Planning, and Design Guide
8.1.3 Domain and protocol firewall
A firewall is a system that manages the flow of information between networking zones such
as the Internet and the private network of an organization. Firewalls can prevent unauthorized
Internet users from accessing services on private networks that are connected to the Internet,
especially intranets. In addition, firewalls can block some virus attacks that must cross the
network boundaries protected by the firewall. Another typical usage of firewalls is to prevent
denial-of-service (DoS) attacks.
A firewall can separate two or more parts of a local network to control data exchange between
departments, network zones, and security domains. ...