XK0-006 Troubleshooting Practice Question
An administrator needs to check the kernel ring buffer for hardware error messages from the current boot. Which command displays this information?
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 the kernel ring buffer, which includes hardware-related messages from the current boot.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
vmstat -f
Why it's wrong here
vmstat -f shows fork statistics.
- ✗
journalctl -k -b 0
Why it's wrong here
journalctl -k shows kernel messages but from systemd journal, not directly the ring buffer.
- ✗
cat /var/log/boot.log
Why it's wrong here
boot.log contains boot-time messages but not necessarily kernel ring buffer.
- ✓
dmesg
Why this is correct
Correct: dmesg shows kernel ring buffer messages.
Go deeper
Related to this question
Learn chapter
Advanced Shell Scripting and Automation
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.
About these practice questions
Courseiva writes every XK0-006 question from scratch — 979 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.