The answer is to enable vNUMA in the VM settings. This is correct because when a VM’s memory exceeds a single NUMA node’s capacity—in this case, 64 GB of memory on a host with only 32 GB per node—the VM becomes a “wide” VM that must span multiple NUMA nodes, yet the guest OS cannot automatically optimize memory locality unless vNUMA is explicitly exposed. Enabling vNUMA allows the guest OS to see the underlying NUMA topology, improving memory access performance by keeping memory local to the vCPUs. On the VMware Certified Professional Data Center Virtualization VCP-DCV exam, this scenario tests your understanding of NUMA awareness and the common trap that simply increasing memory reservation or reducing vCPUs is not the best fix—vNUMA is the direct solution for wide VMs. Remember the memory tip: “Wide VM? vNUMA wins.”
VCP-DCV vSphere Performance and Scaling Practice Question
This VCP-DCV practice question tests your understanding of vsphere performance and scaling. 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 vSphere administrator notices that a VM is performing poorly on a host with a single NUMA node. The VM has 16 vCPUs and 64 GB of memory, but the host has only 32 GB of memory per NUMA node. Which action would MOST LIKELY improve performance?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable vNUMA in the VM settings.
When a VM's memory exceeds a NUMA node's capacity, the VM is considered a 'wide' VM and spans multiple NUMA nodes, but vNUMA is not automatically exposed if the VM was not configured correctly. Enabling vNUMA ensures the guest OS can optimize memory locality. Increasing memory reservation does not help. Reducing vCPUs may help but is not the best solution. The host already has one NUMA node, so it's not a multi-node issue.
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.
✓
Enable vNUMA in the VM settings.
Why this is correct
vNUMA exposes the NUMA topology, allowing the guest OS to optimize memory access across nodes.
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.
✗
Increase the memory reservation to 64 GB.
Why it's wrong here
Increasing memory reservation does not address NUMA locality.
✗
Reduce the number of vCPUs to 8.
Why it's wrong here
Reducing vCPUs may reduce contention but not the fundamental NUMA issue.
✗
Migrate the VM to a host with more memory per NUMA node.
Why it's wrong here
While possible, enabling vNUMA is a more direct solution and can be done without migration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 VCP-DCV 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 VCP-DCV 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.
vSphere Performance and Scaling — This question tests vSphere Performance and Scaling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable vNUMA in the VM settings. — When a VM's memory exceeds a NUMA node's capacity, the VM is considered a 'wide' VM and spans multiple NUMA nodes, but vNUMA is not automatically exposed if the VM was not configured correctly. Enabling vNUMA ensures the guest OS can optimize memory locality. Increasing memory reservation does not help. Reducing vCPUs may help but is not the best solution. The host already has one NUMA node, so it's not a multi-node issue.
What should I do if I get this VCP-DCV question wrong?
Identify which VCP-DCV 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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