What is a Firewall?

A firewall is a dedicated appliance, or software running on a computer which inspects the network traffic passing through it, and denies or permits passage based on a set of rules set by the network administrator.

It is normaly placed between the protected network and the I.S.P modem and acts like a gate that protects assests to ensure nothign private goes out of the network and nothing malicous comes in.

A Firewall's basic task is to regulate some of the flow of traffic between computer networks of different trust levels. Typical examples are the internet which is a zone with no trust and an internal network which is a zone of higher trust. A zone with an intermediate trust level, situated between the internet and trusted internal network, is often referred to as a "perimeter network", or Demilitarized Zone (DMZ)

A firewalls's function within a network is a similiar to a physical firewall with fire doors in building construction. In the former case, it is used to prevent network intrusion to the private network. In the latter case, it is intended to contain and delay structural fire from spreading to the adjacent structures.

Comparison of Routers & Firewalls

	Basic Cable / DSL Router	Cisco ASA	Compu-Guard System
Network Address Translation	(1)
Port forwarding	(1)
ISPEC Vpn	(2)
Open Vpn
Outbound Web Filtering
Spam Blocking
SpywareBlocker
Phish Blocker
Intrusion Detection
Active Directory Intergration
Policy Manager		(3)
Kapersky Anti Virus
Web-Based Pc Remote
Remote Access Portal
Protocol Control		(3)
Q.o.S	(2)
Notes 1) LImited to ONE public IP Address on the "outside" of the device. 2) On appropriate models 3) With appropriate configuration
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