This XK0-005 practice question tests your understanding of troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A Linux service fails to start. Which command should the administrator use to examine recent system logs for error messages related to the service?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
journalctl -xe
Shows recent journal entries with explanations.
systemctl list-units
Why wrong: Lists units but does not show logs.
tail -f /var/log/messages
Why wrong: Generic log, may not be systemd-aware.
dmesg -T
Why wrong: Shows kernel messages, not service-specific logs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
journalctl -xe
The `journalctl -xe` command is correct because it displays the systemd journal with the `-x` flag adding explanatory context to log entries and the `-e` flag jumping to the end of the log, showing the most recent messages. This is the standard way to examine recent system logs for error messages related to a failing service in a systemd-based Linux distribution.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
journalctl -xe
Why this is correct
Shows recent journal entries with explanations.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
systemctl list-units
Why it's wrong here
Lists units but does not show logs.
tail -f /var/log/messages
Why it's wrong here
Generic log, may not be systemd-aware.
dmesg -T
Why it's wrong here
Shows kernel messages, not service-specific logs.
Common exam traps
The trap here is that candidates may choose `tail -f /var/log/messages` out of habit from older SysVinit systems, not realizing that systemd-based distributions (which the XK0-005 exam focuses on) use journald as the default logging system, making `journalctl` the correct tool for service-specific log examination.
Trap categories for this question
Command / output trap
Lists units but does not show logs.
Detailed technical explanation
The `journalctl` command queries the systemd journal, a binary log format stored under `/var/log/journal/` (or `/run/log/journal/` for volatile logs). The `-x` flag adds explanatory help text from the message catalog, which can decode cryptic error codes like `errno` values. In real-world scenarios, a service failing due to a missing configuration file would log an error like `Failed to open /etc/service.conf: No such file or directory`, and `journalctl -xe` would show this with context, while `dmesg` would not capture it.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Troubleshooting — study guide chapter
Learn the concepts, then practise the questions
Troubleshooting practice questions
Targeted practice on this topic area only
All XK0-005 questions
510 questions across all exam domains
CompTIA Linux+ XK0-005 study guide
Full concept coverage aligned to exam objectives
XK0-005 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise XK0-005 questions linked to Security.
Practise XK0-005 questions linked to Troubleshooting.
Practise XK0-005 questions linked to Scripting, Containers and Automation.
Practise XK0-005 questions linked to System Management.
Practise XK0-005 questions linked to XK0-005 fundamentals.
Practise XK0-005 questions linked to XK0-005 scenario.
Practise XK0-005 questions linked to XK0-005 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
The correct answer is: journalctl -xe — The `journalctl -xe` command is correct because it displays the systemd journal with the `-x` flag adding explanatory context to log entries and the `-e` flag jumping to the end of the log, showing the most recent messages. This is the standard way to examine recent system logs for error messages related to a failing service in a systemd-based Linux distribution.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 25, 2026
This XK0-005 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 XK0-005 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.