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 is troubleshooting a VM that is experiencing high latency. The VM is hosted on a hypervisor with other VMs. Which TWO metrics should the engineer review to identify if resource contention is occurring?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Memory ballooning
Memory ballooning (A) is a VMware mechanism where the hypervisor reclaims idle memory from a VM by inflating a balloon driver, forcing the VM to swap. High ballooning indicates memory overcommitment and contention, directly causing latency. CPU ready time (B) measures the time a VM is ready to run but waiting for a physical CPU core; elevated ready time signals CPU contention among VMs on the same hypervisor.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Read the scenario before looking for a memorised answer.
✓
CPU ready time
Why this is correct
Correct; high CPU ready time indicates CPU contention.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network packet drops
Why it's wrong here
Incorrect; packet drops indicate network issues, not resource contention.
✗
Swap usage
Why it's wrong here
Incorrect; swap usage can indicate memory pressure but ballooning is the direct metric.
✗
Disk queue length
Why it's wrong here
Incorrect; disk queue length indicates storage contention, not CPU/memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between guest-level metrics (swap usage, disk queue length) and hypervisor-level metrics (ballooning, ready time), and the trap here is that candidates confuse swap usage (guest OS paging) with memory ballooning (hypervisor reclaim), or assume network packet drops indicate VM contention rather than network issues.
Detailed technical explanation
How to think about this question
CPU ready time is exposed as the 'ready' counter in VMware vSphere (e.g., esxtop 'PCPU' or 'VM' view) and should remain below 5% for acceptable performance; values above 10-20% indicate severe contention. Memory ballooning works via the vmmemctl driver, which the hypervisor uses to reclaim pages without the VM's awareness, and excessive ballooning (>10% of configured memory) forces the guest to swap, degrading performance. These two metrics are the primary indicators of hypervisor-level resource contention, as opposed to guest-level or network/storage issues.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Memory ballooning — Memory ballooning (A) is a VMware mechanism where the hypervisor reclaims idle memory from a VM by inflating a balloon driver, forcing the VM to swap. High ballooning indicates memory overcommitment and contention, directly causing latency. CPU ready time (B) measures the time a VM is ready to run but waiting for a physical CPU core; elevated ready time signals CPU contention among VMs on the same hypervisor.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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