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Sagot :
You need to shut down all ports on the public-facing server immediately command that should use is sudo firewall-cmd --panic-on.
What is Firewall?
A firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's predefined security policies. Basically, a firewall is essentially a barrier between your private internal network and the public Internet. The term firewall originally referred to a wall designed to contain fires within a row of adjacent buildings. A later use refers to similar structures such as the sheet metal that separates the engine room of a vehicle or airplane from the passenger compartment.
Learn more about firewall: https://brainly.com/question/3221529
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