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CompTIA Linux+ XK0-005 (v7) Practice Question

A DevOps engineer is investigating why an HTTPS-only web application on a RHEL server is unreachable from the internet. She has confirmed that the nginx service is active and listening on 0.0.0.0:443, DNS resolves correctly, and the server can reach external hosts. Remote SSH works. She then runs:

$ sudo firewall-cmd --list-all
public (active)
  interfaces: eth0
  services: ssh
  ports:

No other services or ports are listed. Which single command will restore user access while adhering to the principle of least privilege?

  • firewall-cmd --permanent --add-port=53/udp && firewall-cmd --reload

  • firewall-cmd --zone=trusted --change-interface=eth0 --permanent && firewall-cmd --reload

  • firewall-cmd --permanent --add-service=https && firewall-cmd --reload

  • systemctl stop firewalld

CompTIA Linux+ XK0-005 (v7)
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