- A
Delete the production instance and recreate it from a backup.
Why wrong: Destructive; not suitable for testing.
- B
Simulate a zone failure by modifying IAM permissions to restrict access to replicas in a zone.
This allows testing failover behavior without actual outage.
- C
Create a backup of the production database and restore it to a separate instance for validation.
This tests restore procedures without affecting production.
- D
Promote a read replica to a writable instance in a different region.
Why wrong: Spanner does not have read replicas that can be promoted; it uses multi-region instances.
- E
Perform a failover test by initiating a planned regional outage using Spanner's API.
Spanner supports planned failover for testing; this validates failover procedures.
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 runs a global application on Cloud Spanner with a multi-region configuration. They need to test their DR procedures without impacting production. Which THREE actions should they perform? (Choose 3)
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
Simulate a zone failure by modifying IAM permissions to restrict access to replicas in a zone.
Non-destructive tests include creating a backup and restoring it to a separate instance for validation, simulating a zone failure by restricting replica access, and performing regular failover drills via backup/restore to test RTO.
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.
- ✗
Delete the production instance and recreate it from a backup.
Why it's wrong here
Destructive; not suitable for testing.
- ✓
Simulate a zone failure by modifying IAM permissions to restrict access to replicas in a zone.
Why this is correct
This allows testing failover behavior without actual outage.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Create a backup of the production database and restore it to a separate instance for validation.
Why this is correct
This tests restore procedures without affecting production.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Promote a read replica to a writable instance in a different region.
Why it's wrong here
Spanner does not have read replicas that can be promoted; it uses multi-region instances.
- ✓
Perform a failover test by initiating a planned regional outage using Spanner's API.
Why this is correct
Spanner supports planned failover for testing; this validates failover procedures.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
- →
Design for Reliability, Scalability, and Disaster Recovery — study guide chapter
Learn the concepts, then practise the questions
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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: Simulate a zone failure by modifying IAM permissions to restrict access to replicas in a zone. — Non-destructive tests include creating a backup and restoring it to a separate instance for validation, simulating a zone failure by restricting replica access, and performing regular failover drills via backup/restore to test RTO.
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
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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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