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A systems administrator configured firewall rules using firewalld. However, after the system is rebooted, the firewall rules are not present: The systems administrator makes additional checks: Which of the following is the reason the firewall rules are not active?
Correct Answer: D
The reason the firewall rules are not active is that the firewalld service is not enabled. This means that the service will not start automatically at boot time or after a system reload. To enable the firewalld service, the systems administrator needs to use the command sudo systemct1 enable firewalld. This will create a symbolic link from the firewalld service file to the appropriate systemd target, such as multi-user.target. Enabling the service does not start it immediately, so the systems administrator also needs to use the command sudo systemct1 start firewalld or sudo systemct1 reload firewalld to activate the firewall rules.