In the computing language, a firewall is a security software or hardware that can monitor and control network traffic, both incoming and outgoing. It establishes a kind of barrier between reliable internal and unknown external networks.
Therefore, a firewall, also known as a network firewall, is capable of preventing unauthorized access to/from private networks.
A network firewall is based on security rules to accept, reject, or drop specific traffic. The aim of the firewall is to allow or deny the connection or request, depending on implemented rules.
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