Firewall is one of the great features that can be incorporated in your system for analyzing incoming and outgoing traffic. Based on this, they are capable to take an appropriate action. Also, they can perform several conditional evaluations.
These conditional evaluations are also referred to as 'rules'. When a firewall is constructed, it is set with rules that will be strictly followed by it. For example, if the company policy demands that only the sales department will have the access to the FTP site, the firewall can be set accordingly.

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