Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 company wants to reduce Google Cloud costs for a batch processing workload. They currently use n1-standard-4 VMs running 24/7. The workload runs for 2 hours each night. What is the most cost-effective recommendation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use preemptible VMs with a startup script and persistent disk.
D is correct because the workload runs for only 2 hours per night, making preemptible VMs ideal — they cost up to 80% less than on-demand VMs and can be terminated at any time. A startup script ensures the job resumes if the VM is preempted, and using a persistent disk preserves data across interruptions. This combination provides the lowest cost for a short, fault-tolerant batch job.
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.
✗
Use on-demand VMs and rely on sustained use discounts.
Why it's wrong here
Sustained use discounts are automatic but provide less savings than preemptible for sporadic usage.
✗
Use a custom machine type with fewer vCPUs.
Why it's wrong here
Custom machine types can reduce cost but not as much as preemptible VMs for short-duration jobs.
✗
Use committed use discounts for 1 year.
Why it's wrong here
Committed use discounts require a 1-year contract and still charge for 24/7 usage, even when not running.
✓
Use preemptible VMs with a startup script and persistent disk.
Why this is correct
Preemptible VMs cost about 60% less than standard, ideal for short, fault-tolerant batch jobs.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see 'cost-effective' and immediately think of committed use discounts (C) or sustained use discounts (A), failing to recognize that for short, intermittent workloads, preemptible VMs offer the deepest savings despite their preemption risk.
Detailed technical explanation
How to think about this question
Preemptible VMs in Google Cloud are Compute Engine instances that last up to 24 hours and can be terminated with 30 seconds notice; they are priced at the same rate as spot VMs but with a simpler lifecycle. A startup script (specified via metadata key 'startup-script') runs on every boot, allowing the batch job to check a persistent disk for checkpoint data and resume from where it left off. In practice, using a regional persistent disk (e.g., pd-standard) with snapshots can further reduce costs while maintaining durability for the 2-hour window.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use preemptible VMs with a startup script and persistent disk. — D is correct because the workload runs for only 2 hours per night, making preemptible VMs ideal — they cost up to 80% less than on-demand VMs and can be terminated at any time. A startup script ensures the job resumes if the VM is preempted, and using a persistent disk preserves data across interruptions. This combination provides the lowest cost for a short, fault-tolerant batch job.
What should I do if I get this PCA 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This PCA practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCA exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.