firewall definition and reviews

1. Introduction

• A firewall is a system or group of systems that enforces an access control policy between networks
• Mostly the goal is to protect TCP/IP networks
• Other possible firewalls: between applications on a windows environment, java card firewalls, etc.
• Functions:

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Firewall what, how and why tutorial

A firewall is a system that regulates network services that require an entrance and exit must pass through a wall system. In these systems will be emphasized in coming in from which packets are sent, to which the package was addressed, who sent, how much and the number of the package. In addition to this system requires to pass through firewall also can record all incoming or outgoing service on a network.

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