VCP-DCV vSphere Performance and Scaling Practice Question
This VCP-DCV practice question tests your understanding of vsphere performance and scaling. 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.
Which TWO factors contribute to increased CPU ready time on a vSphere host?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Over-provisioning of vCPUs relative to physical cores.
Option B is correct because over-provisioning vCPUs relative to physical cores leads to contention for CPU resources. When the total number of vCPUs across all powered-on VMs exceeds the number of logical processors (including hyper-threads), the ESXi scheduler must time-share access, resulting in increased ready time as VMs wait for a physical core to become available.
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.
✗
Memory ballooning due to memory over-commitment.
Why it's wrong here
Ballooning affects memory, not CPU.
✓
Over-provisioning of vCPUs relative to physical cores.
Why this is correct
Too many vCPUs cause contention and ready time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Using CPU affinity to pin VMs to specific cores.
Why it's wrong here
Affinity can reduce ready time by preventing migration.
✓
Enabling hyper-threading on hosts that already have high vCPU-to-core ratios.
Why this is correct
HT can increase contention because logical processors share cores.
Related concept
Read the scenario before looking for a memorised answer.
✗
High disk latency on the datastore.
Why it's wrong here
Disk latency does not cause CPU ready time.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse memory over-commitment (ballooning) with CPU over-commitment, or mistakenly think that CPU affinity always reduces ready time, when in fact it can increase ready time if not used carefully due to load imbalance and reduced scheduler flexibility.
Detailed technical explanation
How to think about this question
CPU ready time is measured by the ESXi hypervisor's scheduler as the time a VM's vCPU is ready to run but must wait for a physical core. In environments with high vCPU-to-core ratios, the scheduler uses a co-scheduling algorithm for SMP VMs, which can exacerbate ready time if all vCPUs of a VM cannot be scheduled simultaneously. Enabling hyper-threading (Option D) adds logical processors, but if the host already has a high vCPU-to-core ratio, the additional logical CPUs can increase contention and ready time because hyper-threads share execution resources on the same physical core.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Over-provisioning of vCPUs relative to physical cores. — Option B is correct because over-provisioning vCPUs relative to physical cores leads to contention for CPU resources. When the total number of vCPUs across all powered-on VMs exceeds the number of logical processors (including hyper-threads), the ESXi scheduler must time-share access, resulting in increased ready time as VMs wait for a physical core to become available.
What should I do if I get this VCP-DCV 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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