XK0-006 Troubleshooting Practice Question
An administrator wants to view the kernel ring buffer messages to check for hardware errors. 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 displays kernel ring buffer messages, often used for hardware diagnostics.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
journalctl -k
Why it's wrong here
journalctl -k shows kernel messages from systemd-journald, not the ring buffer directly.
- ✓
dmesg
Why this is correct
dmesg prints kernel ring buffer messages.
- ✗
iostat
Why it's wrong here
iostat shows disk I/O stats.
- ✗
vmstat
Why it's wrong here
vmstat shows virtual memory stats.
Go deeper
Related to this question
Learn chapter
Managing Storage and File Systems
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
dmesg
dmesg is a Linux command that displays messages from the kernel ring buffer, used to diagnose hardware and boot issues.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.