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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
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Untitled Document
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