XK0-006 Troubleshooting Practice Question
An administrator needs to check the kernel ring buffer for hardware error messages after a system crash. Which command should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
dmesg
dmesg shows kernel ring buffer messages including hardware errors. journalctl -k shows kernel messages from systemd journal, but dmesg is the direct command for the ring buffer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
dmesg
Why this is correct
dmesg displays kernel ring buffer messages.
- ✗
journalctl -k
Why it's wrong here
Also shows kernel messages but from journal. However, dmesg is more direct for ring buffer.
- ✗
tail -f /var/log/messages
Why it's wrong here
Not specifically kernel ring buffer.
- ✗
strace -e trace=open
Why it's wrong here
strace traces system calls, not kernel messages.
Go deeper
Related to this question
Learn chapter
Process Management and System Monitoring
Key term
Kernel
The kernel is the core program of an operating system that manages hardware resources and provides essential services for all other software to run.
Key term
systemd
systemd is a system and service manager for Linux operating systems that initializes and manages processes, services, and system resources after the kernel boots.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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