Quick Answer
The answer is insufficient memory causing swapping to disk. When memory usage hits 95% while CPU utilization remains below 30%, the operating system is forced to page inactive memory pages to disk in a process known as swapping, which creates a memory bottleneck that stalls application execution. Disk I/O is orders of magnitude slower than RAM, so even with an idle CPU, the application spends most of its time waiting for swap operations to complete—a condition often called thrashing. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your ability to distinguish memory pressure from CPU or disk bottlenecks; a common trap is assuming high CPU is always the culprit when performance degrades. Remember the memory tip: “Low CPU, high RAM? Check the swap.” If you see a cloud VM with low CPU but high memory usage and slow performance, always suspect swapping before anything else.
This CV0-004 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 cloud engineer notices that an application is running slower than expected. Monitoring shows that the CPU utilization is consistently below 30%, but memory usage is at 95%. Which of the following is the most likely cause of the performance issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Insufficient disk space for application logs
Why wrong: Incorrect; disk space would cause write errors, not general slowness.
Insufficient memory causing swapping to disk
Correct; high memory usage leads to swapping, slowing performance.
Network bandwidth saturation
Why wrong: Incorrect; no mention of network issues.
CPU contention due to overprovisioning
Why wrong: Incorrect; CPU utilization is low, so contention is unlikely.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Insufficient memory causing swapping to disk
When memory usage is at 95% and CPU utilization is low, the system is likely thrashing—the operating system is forced to page memory to disk (swap) to free RAM. Disk I/O is orders of magnitude slower than RAM, so even with idle CPU, the application stalls waiting for swap operations. This explains the performance degradation despite low CPU load.
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.
Insufficient disk space for application logs
Why it's wrong here
Incorrect; disk space would cause write errors, not general slowness.
Insufficient memory causing swapping to disk
Why this is correct
Correct; high memory usage leads to swapping, slowing performance.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Network bandwidth saturation
Why it's wrong here
Incorrect; no mention of network issues.
CPU contention due to overprovisioning
Why it's wrong here
Incorrect; CPU utilization is low, so contention is unlikely.
Common exam traps
The trap here is that candidates often associate performance issues solely with CPU or network bottlenecks, overlooking the severe impact of memory exhaustion and disk swapping, which can masquerade as a slow application with ample CPU headroom.
Detailed technical explanation
Under the hood, the OS memory manager uses a page replacement algorithm (e.g., LRU or clock algorithm) to evict pages to the swap file/partition. When memory is nearly full, every memory access may trigger a page fault, causing the disk to spin up for swapping. In a virtualized environment, this can also cause balloon driver activity (e.g., VMware vmmemctl) to reclaim memory from the guest, further degrading performance. Real-world scenario: a database server with a memory leak can exhibit this exact symptom—low CPU but high disk I/O due to paging.
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 CV0-004 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
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FAQ
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
The correct answer is: Insufficient memory causing swapping to disk — When memory usage is at 95% and CPU utilization is low, the system is likely thrashing—the operating system is forced to page memory to disk (swap) to free RAM. Disk I/O is orders of magnitude slower than RAM, so even with idle CPU, the application stalls waiting for swap operations. This explains the performance degradation despite low CPU load.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CV0-004 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 CV0-004 exam.
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