Download now Free registration required
A firewall is a system or group of systems that enforces an access control policy between two networks. The actual means by which this is accomplished varies widely, but in principle, the firewall can be thought of as a pair of mechanisms: one which exists to block traffic, and the other which exists to permit traffic. Some firewalls place a greater emphasis on blocking traffic, while others emphasis permitting traffic. Probably the most important thing to recognise about a firewall is that it implements an access control policy.
- Format: PDF
- Size: 57.5 KB