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ACE Practice Question: A payment service publishes an event to a message…
This ACE practice question tests your understanding of a payment service publishes an event to a message…. 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?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Cloud Tasks with one queue per downstream service
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
Best answer
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
Distractor review
Cloud Storage event notifications with three separate buckets
Cloud Storage events are for storage operations — they're not a general-purpose message bus for business events.
D
Distractor review
Directly calling each downstream service's API synchronously from the payment service
Synchronous calls create tight coupling, increase payment service latency, and cause failures if any downstream service is unavailable.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Related practice questions
Related ACE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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Question 3
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Question 4
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Question 5
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Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
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 supports the fan-out pattern via multiple subscriptions on a single topic. Each subscription receives a copy of every message, allowing independent downstream consumers (inventory, analytics, email) to process the same event without affecting each other.
What should I do if I get this ACE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ACE NAT questions on configuration and troubleshooting.
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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.