This LFCS practice question tests your understanding of operation of running systems. 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 THREE commands can display the current CPU utilization statistics on a Linux system?
free
Why wrong: Shows memory usage.
top
Displays CPU usage dynamically.
sar -u
Reports CPU utilization.
mpstat -P ALL
Reports per-CPU statistics.
uptime
Why wrong: Shows load averages, not per-CPU utilization.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
top
The `top` command (option B) provides a real-time, dynamic view of system processes, including CPU utilization statistics such as user, system, idle, and I/O wait percentages. It is a standard tool for monitoring current CPU performance on Linux systems.
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.
free
Why it's wrong here
Shows memory usage.
top
Why this is correct
Displays CPU usage dynamically.
Related concept
Read the scenario before looking for a memorised answer.
sar -u
Why this is correct
Reports CPU utilization.
Related concept
Read the scenario before looking for a memorised answer.
mpstat -P ALL
Why this is correct
Reports per-CPU statistics.
Related concept
Read the scenario before looking for a memorised answer.
uptime
Why it's wrong here
Shows load averages, not per-CPU utilization.
Common exam traps
The trap here is that candidates may confuse `free` or `uptime` with CPU monitoring tools, but `free` is strictly memory-focused and `uptime` only shows load averages, not actual CPU utilization percentages.
Trap categories for this question
Command / output trap
Shows memory usage.
Detailed technical explanation
Under the hood, `top` reads `/proc/stat` to calculate CPU usage percentages across user, nice, system, idle, iowait, irq, softirq, and steal categories. In real-world scenarios, `top` is often used for immediate troubleshooting, while `sar -u` and `mpstat -P ALL` are better for historical analysis or per-core breakdowns, as they leverage the same kernel counters but with different output formats and sampling intervals.
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 LFCS 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
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FAQ
Operation of Running Systems — This question tests Operation of Running Systems — Read the scenario before looking for a memorised answer..
The correct answer is: top — The `top` command (option B) provides a real-time, dynamic view of system processes, including CPU utilization statistics such as user, system, idle, and I/O wait percentages. It is a standard tool for monitoring current CPU performance on Linux systems.
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.
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Last reviewed: Jun 25, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.
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