Cloud Digital Leader Scaling with Google Cloud operations Practice Question
This GCDL practice question tests your understanding of scaling with google cloud operations. 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 runs batch processing jobs using preemptible VMs to reduce costs. They need to ensure these jobs can scale out significantly during peak hours. Which Compute Engine pricing model should they combine with autoscaling to optimize cost for these workloads?
Why wrong: This is their current model; to scale significantly they may need standard VMs to avoid preemption risk, and sustained use discounts help reduce cost.
B
Sole-tenant nodes.
Why wrong: Sole-tenant nodes are for licensing or security isolation, not for scaling or cost optimization.
C
Sustained use discounts.
Sustained use discounts automatically apply for running standard VMs over a month; they can be combined with preemptible VMs for baseline and burst capacity.
D
Committed use discounts.
Why wrong: Committed use discounts require a 1- or 3-year commitment and cannot be used with preemptible VMs.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Sustained use discounts.
C is correct because sustained use discounts automatically apply to preemptible VMs running for a significant portion of a month, reducing costs further without any upfront commitment. Autoscaling ensures that as demand increases, more preemptible VMs are launched, and the sustained use discount kicks in for the cumulative usage across the month, optimizing cost for bursty, fault-tolerant workloads.
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.
✗
Preemptible VMs with no further discounts.
Why it's wrong here
This is their current model; to scale significantly they may need standard VMs to avoid preemption risk, and sustained use discounts help reduce cost.
✗
Sole-tenant nodes.
Why it's wrong here
Sole-tenant nodes are for licensing or security isolation, not for scaling or cost optimization.
✓
Sustained use discounts.
Why this is correct
Sustained use discounts automatically apply for running standard VMs over a month; they can be combined with preemptible VMs for baseline and burst capacity.
Related concept
Read the scenario before looking for a memorised answer.
✗
Committed use discounts.
Why it's wrong here
Committed use discounts require a 1- or 3-year commitment and cannot be used with preemptible VMs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume preemptible VMs cannot be combined with any discounts, or they mistakenly choose committed use discounts thinking they provide the best savings, without realizing that sustained use discounts are automatic and better suited for variable, autoscaled workloads.
Detailed technical explanation
How to think about this question
Sustained use discounts are applied automatically at the end of each month based on the cumulative usage of preemptible VMs across all zones in a region, with discounts starting at 25% for usage beyond 25% of a month and increasing up to 30% for full-month usage. For autoscaling batch jobs, the discount is calculated on the total vCPU and memory hours, so even if individual VMs are short-lived, the aggregate usage across the month can trigger the discount. In practice, this means a job that runs 200 preemptible VMs for 12 hours each day will accumulate enough hours to hit the maximum discount tier, significantly lowering the effective hourly cost.
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 GCDL question in full detail.
Scaling with Google Cloud operations — This question tests Scaling with Google Cloud operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Sustained use discounts. — C is correct because sustained use discounts automatically apply to preemptible VMs running for a significant portion of a month, reducing costs further without any upfront commitment. Autoscaling ensures that as demand increases, more preemptible VMs are launched, and the sustained use discount kicks in for the cumulative usage across the month, optimizing cost for bursty, fault-tolerant workloads.
What should I do if I get this GCDL 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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