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.
Exhibit
Refer to the exhibit.
```
$ gcloud compute instances list
NAME ZONE MACHINE_TYPE PREEMPTIBLE INTERNAL_IP EXTERNAL_IP
worker-1 us-central1-a e2-standard-4 10.128.0.1 35.184.0.1
worker-2 us-central1-a e2-standard-4 YES 10.128.0.2 35.184.0.2
worker-3 us-central1-b e2-standard-4 10.128.0.3 35.184.0.3
worker-4 us-central1-b e2-standard-4 YES 10.128.0.4 35.184.0.4
```
Refer to the exhibit. A data processing job must complete within 2 hours. The job can be interrupted but must resume from the last checkpoint. Which two instances should be used to minimize cost while meeting the requirement?
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
✓
worker-2 and worker-4
Worker-2 and worker-4 are preemptible (spot) instances, which are significantly cheaper than standard instances. The job can be interrupted and resume from the last checkpoint, so preemptible instances are suitable. This combination minimizes cost while meeting the 2-hour completion requirement because preemptible instances have a maximum runtime of 24 hours and can be terminated earlier, but the checkpointing allows the job to complete within the 2-hour window even if interrupted.
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.
✓
worker-2 and worker-4
Why this is correct
Both are preemptible, offering lowest cost for interruptible workloads.
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.
✗
worker-1 and worker-2
Why it's wrong here
worker-1 is non-preemptible, increasing cost unnecessarily.
✗
worker-2 and worker-3
Why it's wrong here
worker-3 is non-preemptible, increasing cost.
✗
worker-1 and worker-3
Why it's wrong here
Both are non-preemptible, leading to higher cost.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that preemptible instances are unreliable for any time-bound job, but the key is that checkpointing allows resumption, so they are cost-effective for jobs that can tolerate interruptions within the allowed window.
Detailed technical explanation
How to think about this question
Preemptible instances (also called spot instances in other clouds) are compute resources that can be terminated at any time when the provider needs the capacity back, typically with a 30-second warning. They are priced at a fraction (often 60-80% less) of standard instances. For checkpointed workloads, the job saves its state periodically (e.g., every 5 minutes), so if the instance is preempted, the job resumes from the last saved state on a new instance. This makes preemptible instances ideal for batch processing, data analysis, and rendering jobs that are fault-tolerant and can handle interruptions.
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: worker-2 and worker-4 — Worker-2 and worker-4 are preemptible (spot) instances, which are significantly cheaper than standard instances. The job can be interrupted and resume from the last checkpoint, so preemptible instances are suitable. This combination minimizes cost while meeting the 2-hour completion requirement because preemptible instances have a maximum runtime of 24 hours and can be terminated earlier, but the checkpointing allows the job to complete within the 2-hour window even if interrupted.
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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