Cloud Digital Leader Fundamental cloud concepts Practice Question
This GCDL practice question tests your understanding of fundamental cloud concepts. 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 plans to run a batch processing job every night for 2 hours. They want to minimize costs while ensuring the job completes within a 4-hour window. Which pricing model should they choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Preemptible VM instances
Preemptible VM instances (B) are ideal for fault-tolerant, short-lived batch jobs that can handle interruptions. They offer significantly lower cost than on-demand instances, and because the job runs for only 2 hours within a 4-hour window, it can be restarted if preempted, ensuring completion at minimal expense.
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.
✗
On-demand pricing
Why it's wrong here
On-demand is the most expensive and not optimized for short batch jobs.
✓
Preemptible VM instances
Why this is correct
Preemptible VMs cost significantly less and are suitable for fault-tolerant batch jobs.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Committed use discounts
Why it's wrong here
Committed use requires a long-term commitment and is not ideal for a 2-hour nightly job.
✗
Sustained use discounts
Why it's wrong here
Sustained use discounts apply automatically, but preemptible offers greater savings.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that sustained use discounts are the best for any long-running workload, but the trap here is that the 2-hour nightly job does not accumulate enough monthly usage to trigger significant sustained use discounts, making preemptible VMs the correct cost-minimizing choice for interruptible batch jobs.
Detailed technical explanation
How to think about this question
Preemptible VMs in Google Cloud are Compute Engine instances that last up to 24 hours but can be terminated at any time if capacity is needed elsewhere. They are priced at a fraction (typically 60-91% off) of on-demand instances, making them cost-effective for batch processing, data analysis, or rendering jobs that can checkpoint progress. The job's 4-hour window allows for automatic restarts via managed instance groups or custom scripts, ensuring completion despite potential preemption.
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.
Fundamental cloud concepts — This question tests Fundamental cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Preemptible VM instances — Preemptible VM instances (B) are ideal for fault-tolerant, short-lived batch jobs that can handle interruptions. They offer significantly lower cost than on-demand instances, and because the job runs for only 2 hours within a 4-hour window, it can be restarted if preempted, ensuring completion at minimal expense.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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