First, let us define a firewall. A firewall is a system or group of systems utilized to enforce access control between two network entities. This can be accomplished in a variety of ways but fundamentally the firewall is a pair of mechanisms: the first exists only to block traffic and the second one exists to permit traffic. It allows people inside the organization, behind the firewall, to access information on the outside and prevents people on the outside from getting into the users system. The singular most important aspect of a firewall is to allow the System Administrator to easily implement an access control policy.

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