Quick Answer
The answer is cgroups. Control groups, or cgroups, are the correct Linux feature to limit CPU and memory per process with cgroups because they enforce hard resource limits on a group of processes, such as a service and its children, preventing them from starving other system processes. On the CompTIA Linux+ XK0-005 exam, this question tests your ability to distinguish between resource management tools: while ulimit sets per-process limits and nice/renice only adjusts scheduling priority without enforcing caps, cgroups are the proper tool for service-level resource control. A common trap is confusing ulimit with cgroups—remember that ulimit applies to a single shell or process, not a service group. Memory tip: think of cgroups as a "container" that cages resources, while ulimit is just a single leash.
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 system administrator wants to limit the CPU and memory usage of a specific service to prevent it from affecting other processes. Which Linux feature should be used?
ulimit
Why wrong: ulimit sets limits per user session, not per service.
renice
Why wrong: renice adjusts priority of running process.
cgroups
cgroups can limit CPU, memory, I/O for process groups.
nice
Why wrong: nice adjusts scheduling priority, not resource limits.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
cgroups
cgroups (control groups) allow resource limiting per process group. ulimit sets per-process limits, nice/renice adjust priority but do not enforce hard limits. cgroups are the proper tool for service resource control.
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.
ulimit
Why it's wrong here
ulimit sets limits per user session, not per service.
renice
Why it's wrong here
renice adjusts priority of running process.
cgroups
Why this is correct
cgroups can limit CPU, memory, I/O for process groups.
Related concept
Read the scenario before looking for a memorised answer.
nice
Why it's wrong here
nice adjusts scheduling priority, not resource limits.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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 XK0-005 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: cgroups — cgroups (control groups) allow resource limiting per process group. ulimit sets per-process limits, nice/renice adjust priority but do not enforce hard limits. cgroups are the proper tool for service resource control.
Identify which XK0-005 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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