XK0-006 Troubleshooting Practice Question
A technician needs to check the kernel ring buffer for hardware errors detected during system boot. 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, which include hardware detection and errors.
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 logs from systemd-journald, not the kernel ring buffer directly.
- ✗
lspci
Why it's wrong here
lspci lists PCI devices but does not show kernel messages.
- ✓
dmesg
Why this is correct
Correct.
- ✗
cat /var/log/boot.log
Why it's wrong here
boot.log contains boot-time messages but not the kernel ring buffer.
Go deeper
Related to this question
Learn chapter
Process Management and System Monitoring
Key term
dmesg
dmesg is a Linux command that displays messages from the kernel ring buffer, used to diagnose hardware and boot issues.
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.
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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.