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Clairos Learn

26 lessons · UNIX / Linux

Networking

Addresses, routes, listeners, firewall context, DNS files, and SSH dry runs.

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What you will practice

IP address review; Socket listening review; Lsof network review; SSH config dry run.

Use the worked examples when needed, then test your understanding without them.

  1. 01IP address reviewInspect interface addresses and routes.Practice
  2. 02Socket listening reviewRead listener state with ss.Practice
  3. 03Lsof network reviewUse lsof to map listeners to services.Practice
  4. 04SSH config dry runResolve SSH client config without connecting.Practice
  5. 05SSH versionRead client version and server settings.Practice
  6. 06SCP planPreview secure-copy command shape without transfer.Practice
  7. 07DNS file reviewInspect resolver configuration as text.Practice
  8. 08Hosts file reviewInspect local host mappings.Practice
  9. 09Firewall service matchCompare firewall rules with service listeners.Practice
  10. 10Port inventory textNormalize and count port inventory text.Practice
  11. 11Network log grepSearch logs for link and access clues.Practice
  12. 12Interface baselineRecord a basic network baseline.Practice
  13. 13Listener baselineCapture and inspect listener baseline output.Practice
  14. 14SSH key contextConnect key fingerprints to SSH client config.Practice
  15. 15Networking checkpointTie addresses, listeners, firewall, and SSH config together.Practice
  16. 16Route readingRead IP address and route information together.Practice
  17. 17DNS hosts comparisonCompare resolver and hosts file context.Practice
  18. 18Listener ownershipMap listeners to processes and service state.Practice
  19. 19Firewall port inventoryCompare firewall rules to a port inventory file.Practice
  20. 20SSH dry-run reviewResolve SSH config and key context without connecting.Practice
  21. 21SCP transfer planPlan a copy command without opening a network connection.Practice
  22. 22Interface evidence captureCapture interface and route evidence into lab notes.Practice
  23. 23Network incident logsSearch kernel and access logs for network clues.Practice
  24. 24Local name resolutionCompare hostname, hosts-file, and resolver configuration evidence.Practice
  25. 25Route listener firewall correlationRead the route, active listeners, and firewall policy as one network baseline.Practice
  26. 26Networking bridgeCheckpoint name resolution, routes, listeners, and SSH client context.Practice