Firewall is a security system of one of the computer systems that are widely used for both Hardware and Software devices, by Firewall's main role is to serve as a control between different Network (Access Control) by the Firewall. Who (Source), Go (Destination), with what service (Service/Port)
.If the comparison is easier. Think of security, or that we call a "Firewall" guard with identical "guards" are the same, "guard" will detect the card when there are people coming who people who have cards, "guard" is that there is. (Authorized) can also be added, which would have to determine whether the person can go to the floor, where else if (Desitnation) do not have a card, it is treated as a person who does not have permission (Unauthorized), it was unable to reach the building, or whether the card but do not have access to the floor. Functions of the Firewall.
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