Linux Labs· Networking and Secure AdministrationLab 25 of 37

firewalld Zones and Least-Privilege Access

One approved client may reach the app on server1; a second server on the same network may not. Write the narrowest firewalld rule that says so, make it permanent, and prove it from both sides.

  • Intermediate
  • 35 min
  • Not rated yet
  • Free
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In this moduleNetworking and Secure Administration

  1. Inspect IPv4, IPv6, Routes, and Sockets30 min
  2. Persistent NetworkManager Configuration35 min
  3. DNS Client Resolution and Lookup Troubleshooting35 min
  4. firewalld Zones and Least-Privilege AccessYou are here
  5. Configure and Operate an SSH Server35 min
  6. SSH Keys and Access Hardening35 min
  7. SFTP and Verified File Synchronization35 min
  8. Bastion Access and Restricted SSH Forwarding40 min