- A
Cloud Tasks with one queue per downstream service
Why wrong: Cloud Tasks queues tasks for HTTP delivery to a single target — it doesn't natively support the fan-out pattern where multiple consumers receive every message.
- B
Cloud Pub/Sub with one subscription per downstream service on a shared topic
Pub/Sub's fan-out model: one topic, multiple subscriptions. Each subscription receives every message independently, decoupling the payment service from each consumer.
- C
Cloud Storage event notifications with three separate buckets
Why wrong: Cloud Storage events are for storage operations — they're not a general-purpose message bus for business events.
- D
Directly calling each downstream service's API synchronously from the payment service
Why wrong: Synchronous calls create tight coupling, increase payment service latency, and cause failures if any downstream service is unavailable.
Quick Answer
The answer is Cloud Pub/Sub with one subscription per downstream service on a shared topic. This is the correct choice because it implements the pubsub fan-out multiple subscribers pattern, where a single topic distributes every published message independently to each subscription, allowing inventory, analytics, and email services to each process every transaction event without interference or shared state. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of the fundamental difference between topics and subscriptions: a topic is a named channel for publishing messages, while each subscription represents an independent stream of messages for a specific consumer group. A common trap is choosing a single subscription shared by all services, which would force them to compete for messages rather than each receiving a full copy. Remember the memory tip: “One topic, many subscriptions—each subscriber gets its own copy, no competition.”
Google ACE Planning and configuring a cloud solution Practice Question
This ACE practice question tests your understanding of planning and configuring 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.
A payment service publishes an event to a message queue every time a transaction completes. Multiple downstream services (inventory, analytics, email) must each process every event independently. Which messaging pattern and GCP service best supports this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cloud Pub/Sub with one subscription per downstream service on a shared topic
Cloud Pub/Sub with a single topic and one subscription per downstream service is the correct pattern because it implements a fan-out messaging model where each subscriber receives an independent copy of every published message. This ensures that inventory, analytics, and email services each process every transaction event without interference, while Pub/Sub handles at-least-once delivery and automatic scaling.
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.
- ✗
Cloud Tasks with one queue per downstream service
Why it's wrong here
Cloud Tasks queues tasks for HTTP delivery to a single target — it doesn't natively support the fan-out pattern where multiple consumers receive every message.
- ✓
Cloud Pub/Sub with one subscription per downstream service on a shared topic
Why this is correct
Pub/Sub's fan-out model: one topic, multiple subscriptions. Each subscription receives every message independently, decoupling the payment service from each consumer.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud Storage event notifications with three separate buckets
Why it's wrong here
Cloud Storage events are for storage operations — they're not a general-purpose message bus for business events.
- ✗
Directly calling each downstream service's API synchronously from the payment service
Why it's wrong here
Synchronous calls create tight coupling, increase payment service latency, and cause failures if any downstream service is unavailable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between Cloud Tasks (point-to-point task execution) and Cloud Pub/Sub (fan-out messaging), and the trap here is that candidates confuse 'multiple queues' with 'multiple subscriptions,' failing to recognize that Pub/Sub’s topic-subscription model is the native GCP solution for independent event processing.
Detailed technical explanation
How to think about this question
Under the hood, Pub/Sub uses a pull-based or push-based delivery model where each subscription maintains its own acknowledgment (ACK) deadline and message retention policy; if a subscriber fails to ACK within the deadline, the message is redelivered. This pattern is critical in event-driven architectures where downstream services must operate independently—for example, in an e-commerce platform, inventory updates must be atomic and fast, while email notifications can tolerate slight delays, and Pub/Sub allows each subscription to have its own throughput and retry configuration.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this ACE question test?
Planning and configuring a cloud solution — This question tests Planning and configuring a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Pub/Sub with one subscription per downstream service on a shared topic — Cloud Pub/Sub with a single topic and one subscription per downstream service is the correct pattern because it implements a fan-out messaging model where each subscriber receives an independent copy of every published message. This ensures that inventory, analytics, and email services each process every transaction event without interference, while Pub/Sub handles at-least-once delivery and automatic scaling.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 30, 2026
This ACE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ACE exam.
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