DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 AWS CloudFormation to deploy its infrastructure. They have a production stack that includes an RDS PostgreSQL instance with a read replica. The stack update to modify the DB instance class fails with the error: 'The parameter group cannot be changed during a read replica update.' The DevOps engineer needs to update the DB instance class while minimizing downtime and without losing the read replica. The current configuration: the RDS instance is using a custom parameter group. The read replica is using the same parameter group. The update changes the DBInstanceClass property from db.r5.large to db.r5.xlarge. What should the engineer do to successfully update the stack?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Remove the read replica from the stack, update the master instance, then add the read replica back
Option B is correct because the error indicates that the parameter group cannot be changed during a read replica update. To update the instance class, the engineer should first remove the read replica from the stack (or delete it), update the master instance, and then recreate the read replica. Option A is wrong because creating a new parameter group does not resolve the conflict. Option C is wrong because modifying the replica first would also fail. Option D is wrong because the update cannot be done in-place due to the read replica.
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.
✓
Remove the read replica from the stack, update the master instance, then add the read replica back
Why this is correct
This avoids the conflict during the update.
Related concept
Read the scenario before looking for a memorised answer.
✗
Update the read replica first to the new instance class, then update the master instance
Why it's wrong here
The error occurs when trying to update the master with a replica present.
✗
Use the AWS Management Console to modify the DB instance class directly, bypassing CloudFormation
Why it's wrong here
This would cause drift between the stack and the actual resources.
✗
Create a new parameter group for the master instance and associate it before the update
Why it's wrong here
The error is about updating with a read replica, not parameter group association.
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 DOP-C02 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.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove the read replica from the stack, update the master instance, then add the read replica back — Option B is correct because the error indicates that the parameter group cannot be changed during a read replica update. To update the instance class, the engineer should first remove the read replica from the stack (or delete it), update the master instance, and then recreate the read replica. Option A is wrong because creating a new parameter group does not resolve the conflict. Option C is wrong because modifying the replica first would also fail. Option D is wrong because the update cannot be done in-place due to the read replica.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 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.
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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services 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 DOP-C02 exam.
Question Discussion
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