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Firstly, a firewall can’t protect against anything that doesn’t use web traffic as an attack vector. Secondly, a firewall can’t protect against anything it isn’t told to protect against. A firewall is designed to be configured in a way that is beneficial to the owner.

One example would be if there was an IP that is known to belong to a malicious actor. If the firewall is told to block all communication from that IP, the network is protected. However, if there is another IP that is not known to be a problem, the firewall will not block traffic from it, leaving the network exposed to potential threats.

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