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ACE Practice Question: A team must choose between Cloud Pub/Sub and…
This ACE practice question tests your understanding of a team must choose between cloud pub/sub and…. 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 team must choose between Cloud Pub/Sub and Cloud Tasks for a use case where jobs must be delivered to a single HTTP endpoint, each job executed at most once, with rate limiting to 10 requests per second, and with retry on failure. Which service is the better fit and why?
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
Both are equivalent for this use case — choose based on cost
They are not equivalent — Cloud Tasks is specifically designed for this pattern. Choosing based on cost alone ignores the fundamental functional differences.
B
Distractor review
Cloud Pub/Sub — it supports rate-limited push subscriptions and at-most-once delivery
Pub/Sub push subscriptions don't support configurable rate limiting or true at-most-once delivery — it provides at-least-once semantics.
C
Best answer
Cloud Tasks — it provides rate limiting, at-most-once delivery via deduplication, and targeted HTTP dispatch
Cloud Tasks allows explicit rate control (max_dispatches_per_second), task deduplication for at-most-once delivery, and targeted HTTP endpoint dispatch — exactly this use case.
D
Distractor review
Cloud Pub/Sub with a Dataflow consumer applying rate limiting
Adding Dataflow for rate limiting introduces unnecessary complexity when Cloud Tasks natively provides the required behavior.
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.
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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 4
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Question 5
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Question 6
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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 Tasks — it provides rate limiting, at-most-once delivery via deduplication, and targeted HTTP dispatch — Cloud Tasks is designed for exactly this pattern: single HTTP endpoint delivery, at-most-once semantics with deduplication, configurable rate limiting (max dispatches per second), and retry on failure. Pub/Sub delivers to multiple subscribers, doesn't support HTTP rate limiting natively, and guarantees at-least-once delivery.
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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