Quick Answer
The answer is `uname -r` and `cat /proc/version`. The `uname -r` command directly queries the kernel for its release identifier, outputting a concise string like "5.15.0-91-generic," making it the fastest and most standard method for displaying the kernel version on Linux. The `cat /proc/version` command reads the virtual `/proc/version` file, which contains a longer string that includes not only the kernel version but also the compiler version and build date, offering more context. On the CompTIA Linux+ XK0-005 exam, this tests your ability to differentiate between commands that retrieve system information from the kernel itself versus from the `/proc` filesystem. A common trap is confusing `uname -a` (which shows all system info) with `uname -r` (which shows only the kernel release), or mistaking `hostnamectl` or `lsb_release -a` for kernel version commands—those show distribution or OS details, not the kernel. Remember the mnemonic: "Uname gives the Release, Proc gives the Story."
This XK0-005 practice question tests your understanding of troubleshooting. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO commands can be used to display the current kernel version on a Linux system?
modinfo
Why wrong: Shows information about a module.
uname -r
Shows kernel release.
cat /proc/version
Shows kernel version string.
lsmod
Why wrong: Lists loaded modules.
dmesg
Why wrong: Shows kernel ring buffer messages.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
uname -r
The `uname -r` command displays the kernel release version, which is the standard way to quickly check the current kernel version. The `cat /proc/version` command reads the /proc/version file, which contains a string that includes the kernel version, compiler information, and build date, making it another reliable method to view the kernel version.
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.
modinfo
Why it's wrong here
Shows information about a module.
uname -r
Why this is correct
Shows kernel release.
Related concept
Read the scenario before looking for a memorised answer.
cat /proc/version
Why this is correct
Shows kernel version string.
Related concept
Read the scenario before looking for a memorised answer.
lsmod
Why it's wrong here
Lists loaded modules.
dmesg
Why it's wrong here
Shows kernel ring buffer messages.
Common exam traps
CompTIA often tests the distinction between commands that display kernel version (`uname -r`, `/proc/version`) versus commands that show kernel module information (`lsmod`, `modinfo`) or boot logs (`dmesg`), leading candidates to confuse related but incorrect options.
Trap categories for this question
Command / output trap
Shows information about a module.
Detailed technical explanation
The `/proc/version` file is a virtual file generated by the kernel that includes the kernel version string (e.g., 'Linux version 5.10.0-28-amd64'), the GCC version used to compile it, and the build timestamp. The `uname` command retrieves system information from the `utsname` syscall, where `-r` specifically extracts the `release` field from the `utsname` structure, which corresponds to the kernel release number. In real-world scenarios, administrators often use `uname -r` in scripts to conditionally apply kernel-specific patches or drivers.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: uname -r — The `uname -r` command displays the kernel release version, which is the standard way to quickly check the current kernel version. The `cat /proc/version` command reads the /proc/version file, which contains a string that includes the kernel version, compiler information, and build date, making it another reliable method to view the kernel version.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 30, 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.