- A
Use sustained use discounts for short-lived instances.
Why wrong: Sustained use discounts apply automatically, but short-lived instances may not benefit as much.
- B
Use preemptible VMs for batch processing jobs that are fault-tolerant.
Preemptible VMs are cost-effective for fault-tolerant workloads.
- C
Purchase committed use discounts for 1-year or 3-year terms for stable workloads.
Provides significant discounts without changing architecture.
- D
Right-size all Compute Engine instances by analyzing utilization metrics.
Why wrong: Requires changes to instance types and may involve downtime.
- E
Migrate all web serving workloads to Cloud Functions to benefit from pay-per-use pricing.
Why wrong: Significant architectural change and may not be suitable for all web serving.
Quick Answer
The answer is to purchase committed use discounts for 1-year or 3-year terms for stable workloads and to use preemptible VMs for fault-tolerant batch processing. Committed use discounts provide a significant price reduction in exchange for a predictable resource consumption commitment, making them ideal for steady-state workloads like web serving and real-time analytics where architectural changes are not desired. Preemptible VMs, which cost up to 80% less than standard instances, are perfect for interruptible batch processing jobs that can handle sudden termination, directly lowering compute costs without altering the application design. On the Google Professional Cloud Architect exam, this question tests your ability to match cost optimization tools to workload characteristics—a common trap is confusing preemptible VMs with sustained use discounts, which are automatic and require no commitment. Memory tip: think “Stable gets CUDs, spotty gets Preemptible.”
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. 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 company wants to optimize their cloud spending on Google Cloud. They have a mix of workloads including batch processing, real-time analytics, and web serving. Which TWO strategies should they implement to reduce costs without significant architectural changes? (Choose two.)
Answer choices
Why each option matters
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 for batch processing jobs that are fault-tolerant.
Preemptible VMs are short-lived, fault-tolerant instances that cost significantly less than standard VMs, making them ideal for batch processing jobs that can handle interruptions. This strategy directly reduces compute costs without requiring architectural changes, as the workloads are already designed to be resilient to failures.
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 sustained use discounts for short-lived instances.
Why it's wrong here
Sustained use discounts apply automatically, but short-lived instances may not benefit as much.
- ✓
Use preemptible VMs for batch processing jobs that are fault-tolerant.
Why this is correct
Preemptible VMs are cost-effective for fault-tolerant workloads.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Purchase committed use discounts for 1-year or 3-year terms for stable workloads.
Why this is correct
Provides significant discounts without changing architecture.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Right-size all Compute Engine instances by analyzing utilization metrics.
Why it's wrong here
Requires changes to instance types and may involve downtime.
- ✗
Migrate all web serving workloads to Cloud Functions to benefit from pay-per-use pricing.
Why it's wrong here
Significant architectural change and may not be suitable for all web serving.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse sustained use discounts (which require long-running instances) with preemptible VMs (which are for short-lived, fault-tolerant workloads), or they assume right-sizing is a 'no-change' strategy when it typically involves instance type modifications that affect architecture.
Detailed technical explanation
How to think about this question
Preemptible VMs are Compute Engine instances that last up to 24 hours and can be terminated at any time by Google Cloud, offering up to 60-91% discount compared to standard VMs. Committed use discounts (CUDs) provide up to 57% discount for 1-year or 70% for 3-year commitments in exchange for a consistent resource usage baseline, which is ideal for stable, predictable workloads like web serving or real-time analytics that run continuously.
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
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FAQ
Questions learners often ask
What does this PCA question test?
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 for batch processing jobs that are fault-tolerant. — Preemptible VMs are short-lived, fault-tolerant instances that cost significantly less than standard VMs, making them ideal for batch processing jobs that can handle interruptions. This strategy directly reduces compute costs without requiring architectural changes, as the workloads are already designed to be resilient to failures.
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.
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Last reviewed: Jun 11, 2026
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