Quick Answer
The answer is `top` and `htop`. Both commands provide live process monitoring with top and htop, displaying dynamically updating information about running processes, CPU load, and memory usage directly in the terminal. The `top` command is the standard, built-in tool that refreshes every few seconds, while `htop` offers a more colorful, interactive interface with scrollable process lists and mouse support. On the CompTIA Linux+ XK0-005 exam, this question tests your ability to identify real-time monitoring utilities; a common trap is confusing `ps` (which takes a static snapshot) with these live-updating tools. Remember that both `top` and `htop` are for ongoing observation, not one-time checks. A helpful memory tip: think of "top" as the "time-oriented process" viewer, and "htop" as the "human-friendly top" — both keep refreshing, so you can watch performance change as it happens.
This XK0-005 practice question tests your understanding of system management. 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.
A systems administrator wants to monitor system performance in real time. Which TWO commands can be used to display live updating information about processes, CPU, and memory usage? (Select TWO.)
top
Real-time interactive process viewer.
htop
Enhanced real-time interactive process viewer.
ps aux
Why wrong: Static snapshot of processes.
sar -u 1 5
Why wrong: Historical data collection, not real-time interactive.
vmstat 1
Why wrong: Periodic output but not interactive like top.
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 provides a real-time, dynamically updating view of system processes, CPU usage, and memory usage. It refreshes by default every few seconds, making it a standard tool for live performance monitoring. Similarly, `htop` is an enhanced interactive process viewer that offers a more user-friendly interface with color-coded, real-time updates on CPU, memory, and process information.
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.
top
Why this is correct
Real-time interactive process viewer.
Related concept
Read the scenario before looking for a memorised answer.
htop
Why this is correct
Enhanced real-time interactive process viewer.
Related concept
Read the scenario before looking for a memorised answer.
ps aux
Why it's wrong here
Static snapshot of processes.
sar -u 1 5
Why it's wrong here
Historical data collection, not real-time interactive.
vmstat 1
Why it's wrong here
Periodic output but not interactive like top.
Common exam traps
The trap here is that candidates often confuse static commands like `ps aux` with live monitoring tools, or they mistake `vmstat 1` for a process-level viewer when it actually provides aggregate system statistics without per-process details.
Trap categories for this question
Command / output trap
Periodic output but not interactive like top.
Detailed technical explanation
Under the hood, `top` reads the `/proc` filesystem (specifically `/proc/stat`, `/proc/meminfo`, and `/proc/[pid]/status`) to gather process and resource data, then refreshes the display using `ncurses`. `htop` uses the same `/proc` interface but adds features like mouse support, tree view, and the ability to send signals directly. A subtle behavior: `top` by default sorts by CPU usage, while `htop` allows sorting by any column with a single keystroke, and both can be configured to show per-core CPU usage.
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
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FAQ
System Management — This question tests System Management — Read the scenario before looking for a memorised answer..
The correct answer is: top — The `top` command provides a real-time, dynamically updating view of system processes, CPU usage, and memory usage. It refreshes by default every few seconds, making it a standard tool for live performance monitoring. Similarly, `htop` is an enhanced interactive process viewer that offers a more user-friendly interface with color-coded, real-time updates on CPU, memory, and process information.
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 11, 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.
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