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.
Exhibit
Refer to the exhibit.
```
GID NAME NWLD %USED %RUN %SYS %WAIT %RDY %CSTP %MLMTD
12345 VM_01 4 20.0 15.0 5.0 25.0 45.2 30.1 0.0
```
Refer to the exhibit. An administrator runs esxtop and sees the above output for a virtual machine. What 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.
Exhibit
Refer to the exhibit.
```
GID NAME NWLD %USED %RUN %SYS %WAIT %RDY %CSTP %MLMTD
12345 VM_01 4 20.0 15.0 5.0 25.0 45.2 30.1 0.0
```
A
The VM is running on a host with Hyper-Threading disabled.
Why wrong: Disabling HT would reduce available logical CPUs but would not directly cause high %CSTP; it would more likely increase %RDY.
B
The memory of the VM is overcommitted.
Why wrong: Memory overcommitment would show as high %SWP% or memory ballooning, not high %RDY and %CSTP.
C
The host has too many other VMs competing for resources.
Why wrong: While competition can increase %RDY, it does not specifically cause high %CSTP unless the VMs themselves have many vCPUs.
D
The VM has too many vCPUs for the available physical cores.
High %RDY indicates vCPU contention, and high %CSTP indicates co-scheduling overhead, both symptoms of vCPU overcommitment.
E
The VM has CPU affinity configured to a single core.
Why wrong: CPU affinity would force the VM to run on a specific core, potentially increasing %RDY if that core is busy, but %CSTP would not be elevated because there is no co-scheduling across multiple physical CPUs.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VM has too many vCPUs for the available physical cores.
The exhibit shows a virtual machine with 8 vCPUs but only 4 physical cores (PCPU) available, as indicated by the %USED and %RUN columns. This leads to CPU ready time (%RDY) being high, which is a classic symptom of CPU overcommitment where the VM's vCPU count exceeds the available physical cores, causing scheduling contention. Option D is correct because the VM has too many vCPUs for the available physical cores, resulting in excessive ready time and degraded performance.
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.
✗
The VM is running on a host with Hyper-Threading disabled.
Why it's wrong here
Disabling HT would reduce available logical CPUs but would not directly cause high %CSTP; it would more likely increase %RDY.
✗
The memory of the VM is overcommitted.
Why it's wrong here
Memory overcommitment would show as high %SWP% or memory ballooning, not high %RDY and %CSTP.
✗
The host has too many other VMs competing for resources.
Why it's wrong here
While competition can increase %RDY, it does not specifically cause high %CSTP unless the VMs themselves have many vCPUs.
✓
The VM has too many vCPUs for the available physical cores.
Why this is correct
High %RDY indicates vCPU contention, and high %CSTP indicates co-scheduling overhead, both symptoms of vCPU overcommitment.
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.
✗
The VM has CPU affinity configured to a single core.
Why it's wrong here
CPU affinity would force the VM to run on a specific core, potentially increasing %RDY if that core is busy, but %CSTP would not be elevated because there is no co-scheduling across multiple physical CPUs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse high %RDY with memory overcommitment or general host contention, but the specific clue is the vCPU count exceeding physical cores, which directly points to CPU overcommitment as the root cause.
Trap categories for this question
Command / output trap
Memory overcommitment would show as high %SWP% or memory ballooning, not high %RDY and %CSTP.
Detailed technical explanation
How to think about this question
In ESXi's CPU scheduler, when a VM has more vCPUs than physical cores, the scheduler must time-slice the cores among the vCPUs, leading to increased %RDY (ready time) as vCPUs wait for a physical core. This is distinct from %CSTP (co-stop time), which occurs when vCPUs of a multi-vCPU VM are not scheduled simultaneously due to CPU affinity or Hyper-Threading constraints. A real-world scenario is a VM with 16 vCPUs on a 8-core host, where %RDY can exceed 20%, severely impacting latency-sensitive applications like databases.
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: The VM has too many vCPUs for the available physical cores. — The exhibit shows a virtual machine with 8 vCPUs but only 4 physical cores (PCPU) available, as indicated by the %USED and %RUN columns. This leads to CPU ready time (%RDY) being high, which is a classic symptom of CPU overcommitment where the VM's vCPU count exceeds the available physical cores, causing scheduling contention. Option D is correct because the VM has too many vCPUs for the available physical cores, resulting in excessive ready time and degraded performance.
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.
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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