PCDOE Optimizing service performance Practice Question
This PCDOE practice question tests your understanding of optimizing service performance. 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.
A large stateful service running on Compute Engine experiences variable performance due to CPU throttling from noisy neighbors. Which solution provides the most consistent performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use sole-tenant nodes to isolate the VMs
Sole-tenant nodes ensure that your VMs are the only ones running on the underlying physical server, eliminating resource contention from other tenants (noisy neighbors). This provides consistent CPU performance because the vCPUs are not oversubscribed and the full physical core capacity is dedicated to your instances.
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 live migration for the VMs
Why it's wrong here
Live migration moves VMs during maintenance but does not prevent CPU throttling from other tenants.
✓
Use sole-tenant nodes to isolate the VMs
Why this is correct
Sole-tenant nodes ensure your VMs are the only ones on the physical machine, eliminating neighbor noise.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use preemptible VMs for stateful workloads
Why it's wrong here
Preemptible VMs are not suitable for stateful workloads due to possible termination; they also share resources.
✗
Purchase committed use discounts for lower cost
Why it's wrong here
Discounts reduce cost but do not affect resource contention or performance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse live migration (which maintains availability during host maintenance) with performance isolation, or assume that committing to a discount (CUD) implies dedicated resources.
Detailed technical explanation
How to think about this question
Sole-tenant nodes use the same underlying Compute Engine hypervisor but pin the entire physical machine to a single project, disabling the scheduler from placing other tenants' VMs on that host. This effectively provides a dedicated host environment without requiring full bare-metal servers, and you can still use features like live migration and instance templates within the sole-tenant node group.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
Optimizing service performance — This question tests Optimizing service performance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use sole-tenant nodes to isolate the VMs — Sole-tenant nodes ensure that your VMs are the only ones running on the underlying physical server, eliminating resource contention from other tenants (noisy neighbors). This provides consistent CPU performance because the vCPUs are not oversubscribed and the full physical core capacity is dedicated to your instances.
What should I do if I get this PCDOE 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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