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what is a firewall a firewall is a
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system that is designed to prevent
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unauthorized access from entering a
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private network by filtering the
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information that comes in from the
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internet it blocks unwanted traffic and
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permits wanted traffic a firewall's
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purpose is to create a safety barrier
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between a private network and the public
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internet because out on the internet
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there's always going to be hackers and
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malicious traffic that may try to
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penetrate into a private network to
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cause harm and a firewall is the main
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component on a network to prevent this a
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firewall works by filtering the incoming
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network data and determines by its rules
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if it is allowed to enter a network
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these rules are known as an access
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control list these rules are
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customizable and are determined by the
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network administrator the administrator
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not only decides what can enter the
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network but also what can leave a
