- A
Cloud SQL with one primary instance and cross-region read replicas
Why wrong: Cross-region read replicas provide low-latency reads but with eventual consistency lag. Write operations still go to the single primary, adding latency for distant users.
- B
Cloud Spanner multi-region configuration
Cloud Spanner multi-region provides strong consistency for writes with globally distributed read replicas for low-latency reads — exactly matching the three-continent, strong-consistency requirement.
- C
Cloud Firestore in multi-region mode
Why wrong: Firestore multi-region provides strong consistency for documents but isn't a relational database — it doesn't support the complex transactional inventory management patterns of an e-commerce platform.
- D
Cloud SQL with Cloud Memorystore caching layer for reads
Why wrong: A caching layer reduces read latency but doesn't solve write consistency across regions — stale cache data can cause inventory overselling.
Quick Answer
The answer is Cloud Spanner multi-region configuration. This is the correct choice because Spanner uniquely combines strong global consistency with sub-50ms read latency across continents, using TrueTime for global clock synchronization and Paxos-based replication to enforce ACID transactions on distributed inventory data. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of when to choose Spanner over Cloud SQL: Cloud SQL offers strong consistency but only within a single region, making it a common trap for candidates who overlook the global requirement. A key memory tip is to associate “global e-commerce” with “Spanner” and remember that Spanner’s TrueTime is what enables both strong consistency and low latency across continents—if the question mentions multiple continents or <50ms latency with strong consistency, Spanner is the only fit.
Google ACE Planning and configuring a cloud solution Practice Question
This ACE practice question tests your understanding of planning and configuring a cloud solution. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An application architect is comparing Cloud SQL (PostgreSQL) and Cloud Spanner for a new global e-commerce platform. The platform must serve customers on three continents with <50ms latency for reads and strong consistency for inventory updates. Which service best fits?
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 Spanner multi-region configuration
Cloud Spanner multi-region configuration is the correct choice because it provides strong global consistency with <50ms read latency across continents, which is essential for an e-commerce platform requiring real-time inventory updates. Spanner uses TrueTime and Paxos-based replication to ensure ACID transactions globally, meeting both the latency and consistency requirements simultaneously.
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 SQL with one primary instance and cross-region read replicas
Why it's wrong here
Cross-region read replicas provide low-latency reads but with eventual consistency lag. Write operations still go to the single primary, adding latency for distant users.
- ✓
Cloud Spanner multi-region configuration
Why this is correct
Cloud Spanner multi-region provides strong consistency for writes with globally distributed read replicas for low-latency reads — exactly matching the three-continent, strong-consistency requirement.
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 Firestore in multi-region mode
Why it's wrong here
Firestore multi-region provides strong consistency for documents but isn't a relational database — it doesn't support the complex transactional inventory management patterns of an e-commerce platform.
- ✗
Cloud SQL with Cloud Memorystore caching layer for reads
Why it's wrong here
A caching layer reduces read latency but doesn't solve write consistency across regions — stale cache data can cause inventory overselling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that read replicas or caching layers can provide strong consistency globally, but only Spanner's synchronous replication and TrueTime guarantee ACID transactions across continents.
Detailed technical explanation
How to think about this question
Cloud Spanner achieves global strong consistency through TrueTime, which provides globally synchronized clocks, and the Paxos consensus protocol for atomic commits across replicas. In a multi-region configuration, Spanner automatically routes reads to the nearest replica while still ensuring linearizability, which is critical for inventory systems where a single stock count must be accurate worldwide. A real-world scenario is a flash sale where thousands of users on different continents attempt to purchase the same item; Spanner prevents overselling by enforcing consistent inventory checks.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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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Planning and configuring a cloud solution — study guide chapter
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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 Spanner multi-region configuration — Cloud Spanner multi-region configuration is the correct choice because it provides strong global consistency with <50ms read latency across continents, which is essential for an e-commerce platform requiring real-time inventory updates. Spanner uses TrueTime and Paxos-based replication to ensure ACID transactions globally, meeting both the latency and consistency requirements simultaneously.
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.
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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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