Google ACE Practice Question: Ensuring successful operation of a cloud solution
This ACE practice question tests your understanding of ensuring successful operation of a cloud solution. 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.
Which TWO practices help ensure the reliability of a Cloud Functions deployment? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Cloud Tasks to decouple function invocations.
Option D is correct because Cloud Tasks decouples function invocations by queuing requests and delivering them asynchronously, which improves reliability by handling spikes in traffic without dropping requests and providing automatic retries on failure. Option E is correct because implementing retry policies for background functions (e.g., Cloud Functions triggered by Pub/Sub or Cloud Storage) ensures that transient failures are automatically retried, increasing the overall reliability of the 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.
✗
Deploy functions in a single region to minimize latency.
Why it's wrong here
Single region is a single point of failure.
✗
Configure a VPC connector for all functions.
Why it's wrong here
VPC connector is for private network access, not reliability.
✗
Set maximum instances to 1 to avoid resource contention.
Why it's wrong here
Limits concurrency; can cause throttling under load.
✓
Use Cloud Tasks to decouple function invocations.
Why this is correct
Cloud Tasks provides retries and scheduling.
Related concept
Read the scenario before looking for a memorised answer.
✓
Implement retry policies for background functions.
Why this is correct
Retry on failure increases reliability.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that limiting concurrency (e.g., max instances = 1) improves reliability, when in fact it reduces fault tolerance and increases latency under load.
Detailed technical explanation
How to think about this question
Cloud Tasks uses HTTP targets to queue function invocations, providing at-least-once delivery and configurable retry parameters (e.g., max retries, min/max backoff) that align with exponential backoff best practices. For background functions, retry policies are configured via the event trigger's dead-letter queue or by setting the `retry` parameter to `true` in the function's event trigger, which causes the platform to automatically retry failed invocations based on the event's delivery schema. In practice, combining Cloud Tasks with retry policies ensures that transient errors (e.g., 503s from downstream services) are handled gracefully, while permanent errors can be routed to a dead-letter queue for manual inspection.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Ensuring successful operation of a cloud solution — This question tests Ensuring successful operation of a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Cloud Tasks to decouple function invocations. — Option D is correct because Cloud Tasks decouples function invocations by queuing requests and delivering them asynchronously, which improves reliability by handling spikes in traffic without dropping requests and providing automatic retries on failure. Option E is correct because implementing retry policies for background functions (e.g., Cloud Functions triggered by Pub/Sub or Cloud Storage) ensures that transient failures are automatically retried, increasing the overall reliability of the deployment.
What should I do if I get this ACE 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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