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→Practice script
It will print out a menu of exercises. You can pick any of them in any order. The script will first reset the firewall settings to CentOS defaults and then make some modifications from those defaults.
Don't cheat. The point of the exercises is for you to find the problem using regular troubleshooting tools, not to reverse-engineer the lab.
Finish the exercises, and record any information you feel you'll need to remember to solve problems like this in the future (e.g. in a practical test).
