Avaya Business Secure Router 252 Configuration - Basics Manuel d'utilisateur télécharger pdf (Page 153)

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Nortel Business Secure Router 252 Configuration — Basics

Chapter 10

Firewalls

This chapter gives some background information on firewalls and introduces the

Business Secure Router firewall.

Firewall overview

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 can also be defined as a mechanism used to protect a trusted network

from an untrusted network. Of course, firewalls cannot solve every security

problem. A firewall is one of the mechanisms used to establish a network security

perimeter in support of a network security policy. It must 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.

Types of firewalls

There are three main types of firewalls:

1 Packet Filtering firewalls

2 Application level firewalls

3 Stateful Inspection firewalls

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