Next: Linux Review Quiz / Summary

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Lesson 25 • Linux Wrap-Up

Linux Review Quiz / Summary

This page wraps up the Linux troubleshooting section. Review the core commands, lock in the right support mindset, and finish with a final quiz that checks whether you can think through common Linux issues without guessing.

commands recap troubleshooting flow service checks networking basics permissions final quiz
Difficulty Wrap-up / confidence check
Estimated Time 15–20 minutes
Goal Finish Linux strong

What you should now be able to do

  • Check whether a service is running or failed
  • Read the right logs instead of guessing
  • Confirm adapter, IP, and route problems
  • Spot missing execute permissions
  • Separate DNS problems from general connectivity problems
  • Write short, professional support notes

Big lesson from this Linux block

Linux troubleshooting is not about memorizing random commands. It is about building a repeatable pattern: check status, gather evidence, identify the cause, fix carefully, verify the result.

1) Service Troubleshooting

When something tied to a service breaks, start with service state and then move to logs.

systemctl status nginx journalctl -u nginx -n 20

2) Networking Basics

Check whether the machine has an address, then whether it knows where to send traffic.

ip addr ip route ping -c 2 8.8.8.8

3) Permissions

If a script or file exists but will not run, inspect permission bits before changing anything.

ls -l backup.sh chmod +x backup.sh

4) Storage Checks

Find out whether a filesystem is full first, then narrow down what is consuming space.

df -h du -sh /var/*

5) DNS / Name Resolution

If IP works but hostname fails, the problem is probably not total connectivity.

ping -c 2 8.8.8.8 ping -c 2 example.com cat /etc/resolv.conf

6) CLI Discipline

Know where you are, what files exist, and what changed before you act.

pwd ls -l cd /opt/backup tail -n 20 /var/log/app.log

Linux Troubleshooting Flow

This is the sequence you want students to remember after finishing this section.

1. Observe
2. Check Status
3. Read Evidence
4. Find Cause
5. Fix Safely
6. Verify

Final Linux Review Quiz

Score at least 75% to mark the Linux review complete and unlock the next lesson.

1) Which command is the best first check for a Linux service that appears down?

2) Which command best helps explain why a service failed?

3) A script exists but returns “Permission denied.” What is the best first command?

4) A server has an IP but cannot reach outside networks. What is the best next command after checking the interface?

5) Which command is the best first check when a user says the disk is full?

6) If IP ping works but hostname ping fails, what is the most likely issue type?

7) Which command helps inspect current resolver settings?

8) Which command is most useful for reading the latest lines of a log file?

9) What is the safest permission fix for a script that needs to run?

10) What is the strongest final Linux troubleshooting habit?

Linux review complete saved. Strong finish.
You need 75% or higher to unlock the next lesson.

Linux Section Complete

This page should leave the learner feeling clear on the basics: service checks, logs, permissions, routes, DNS, and safe troubleshooting flow.

Next Lesson

Unlock the next lesson by passing the quiz or marking this lesson complete.

Next: Windows Troubleshooting Intro

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