Cloud Digital Leader Fundamental cloud concepts Practice Question
This GCDL practice question tests your understanding of fundamental cloud concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 a critical application on Compute Engine in us-central1. They plan to create a disaster recovery (DR) site in us-west1 that can be activated within minutes if the primary region fails. What is the most cost-effective DR strategy that meets the recovery time objective (RTO) of 30 minutes?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Warm standby in us-west1 with preemptible VMs and persistent disk snapshots.
Option B is correct because a warm standby using preemptible VMs and persistent disk snapshots provides a cost-effective DR solution that can be activated within minutes. Preemptible VMs are significantly cheaper than regular VMs, and persistent disk snapshots stored in Cloud Storage can be restored quickly to create new disks in us-west1, meeting the 30-minute RTO without the high cost of an always-on active-active deployment.
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.
✗
Cold standby with regular backups to Cloud Storage.
Why it's wrong here
Restoring from Cloud Storage would exceed the 30-minute RTO.
✓
Warm standby in us-west1 with preemptible VMs and persistent disk snapshots.
Why this is correct
Snapshots can be used to create disks quickly, and preemptible VMs reduce cost.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Active-active deployment in both regions with load balancing.
Why it's wrong here
Active-active is costly and may not be needed for DR.
✗
Use a managed instance group in us-west1 with replication from the primary.
Why it's wrong here
This is similar to warm standby, but the text says 'used as a cold standby', which is incorrect.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that 'warm standby' always means running full instances, but here preemptible VMs combined with snapshots provide a low-cost warm standby that can be activated quickly, unlike cold standby which is too slow or active-active which is too expensive.
Trap categories for this question
Similar concept trap
This is similar to warm standby, but the text says 'used as a cold standby', which is incorrect.
Detailed technical explanation
How to think about this question
Preemptible VMs in Compute Engine can be used for stateless workloads or as part of a DR plan because they can be terminated at any time, but they are ideal for cost-sensitive DR scenarios where the VMs are only needed during failover. Persistent disk snapshots are incremental and stored in Cloud Storage, allowing fast restoration of disk data to a new region; the restore time depends on the snapshot size and disk type, but for many applications it can be under 30 minutes. Real-world considerations include ensuring that the application can handle the temporary nature of preemptible VMs and that the snapshots are regularly updated to minimize data loss.
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: Warm standby in us-west1 with preemptible VMs and persistent disk snapshots. — Option B is correct because a warm standby using preemptible VMs and persistent disk snapshots provides a cost-effective DR solution that can be activated within minutes. Preemptible VMs are significantly cheaper than regular VMs, and persistent disk snapshots stored in Cloud Storage can be restored quickly to create new disks in us-west1, meeting the 30-minute RTO without the high cost of an always-on active-active deployment.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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