- A
Add more read-only replicas in the European region.
Why wrong: Read-only replicas reduce read latency but do not affect write latency. Writes still go to the leader region.
- B
Use a regional Spanner instance in Europe and replicate data asynchronously to the multi-region instance.
Why wrong: Asynchronous replication would break strong consistency and Spanner's guarantees. Spanner does not support this configuration.
- C
Migrate the workload to Cloud Bigtable with replication.
Why wrong: Bigtable does not provide strong consistency across regions; it offers eventual consistency. The application requires strong consistency.
- D
Change the leader region to a European region, such as europe-west1.
Setting the leader region to Europe ensures writes are committed in Europe, reducing write latency for European users while maintaining strong consistency.
PCDOE Practice Question: Design for Reliability, Scalability, and Disaster Recovery
This PCDOE practice question tests your understanding of design for reliability, scalability, and disaster recovery. 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.
A company uses Cloud Spanner in a multi-region configuration with the leader region in us-central1. They want to improve write latency for users in Europe. The application's writes are latency-sensitive and must be strongly consistent. Which action should the engineer take?
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
Change the leader region to a European region, such as europe-west1.
In Spanner multi-region, the leader region determines where writes are committed. To reduce write latency for European users, set the leader region to a European region (e.g., europe-west1). All writes will be committed in that region, reducing round-trip time for European clients. This does not affect consistency; Spanner still provides strong consistency globally. Adding more read replicas in Europe does not affect write latency. Moving the application to Cloud SQL or Bigtable does not provide the same global strong consistency or may not meet requirements.
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.
- ✗
Add more read-only replicas in the European region.
Why it's wrong here
Read-only replicas reduce read latency but do not affect write latency. Writes still go to the leader region.
- ✗
Use a regional Spanner instance in Europe and replicate data asynchronously to the multi-region instance.
Why it's wrong here
Asynchronous replication would break strong consistency and Spanner's guarantees. Spanner does not support this configuration.
- ✗
Migrate the workload to Cloud Bigtable with replication.
Why it's wrong here
Bigtable does not provide strong consistency across regions; it offers eventual consistency. The application requires strong consistency.
- ✓
Change the leader region to a European region, such as europe-west1.
Why this is correct
Setting the leader region to Europe ensures writes are committed in Europe, reducing write latency for European users while maintaining strong consistency.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Design for Reliability, Scalability, and Disaster Recovery — study guide chapter
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FAQ
Questions learners often ask
What does this PCDOE question test?
Design for Reliability, Scalability, and Disaster Recovery — This question tests Design for Reliability, Scalability, and Disaster Recovery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the leader region to a European region, such as europe-west1. — In Spanner multi-region, the leader region determines where writes are committed. To reduce write latency for European users, set the leader region to a European region (e.g., europe-west1). All writes will be committed in that region, reducing round-trip time for European clients. This does not affect consistency; Spanner still provides strong consistency globally. Adding more read replicas in Europe does not affect write latency. Moving the application to Cloud SQL or Bigtable does not provide the same global strong consistency or may not meet requirements.
What should I do if I get this PCDOE question wrong?
Identify which PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PCDOE 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 PCDOE exam.
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