- A
The DBInstance resource has a DeletionPolicy attribute set to 'Retain', causing CloudFormation to skip updates to dependent resources.
When DeletionPolicy is Retain, CloudFormation may not update the DBInstance and its dependencies correctly during updates.
- B
The CloudFormation stack has a stack policy that denies updates to the security group resources.
Why wrong: Stack policies control updates to resources, but security group updates are not typically denied by default.
- C
The security group rules are defined inline within the AWS::EC2::SecurityGroup resource, and CloudFormation does not update inline rules after initial creation.
Why wrong: CloudFormation can update inline rules if the template is modified and a stack update is performed.
- D
The RDS database is in a VPC that requires a VPC endpoint for CloudFormation to update security groups.
Why wrong: VPC endpoints are not required for CloudFormation to update security groups in the same VPC.
Quick Answer
The answer is that a DeletionPolicy set to 'Retain' on the DBInstance resource is silently preventing security group updates. This occurs because CloudFormation treats resources with a Retain policy as immutable during stack updates—it will not replace or modify the resource, and critically, it skips updates to any dependent resources like the associated security group rules. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this tests your understanding of how DeletionPolicy interacts with CloudFormation's update behavior, often appearing as a subtle trap where candidates assume security group rules are independent. The key insight is that Retain doesn’t just protect deletion; it blocks all modifications to the resource and its dependencies, causing updates to be silently ignored. Remember the mnemonic: "Retain means remain—no replace, no update, no change."
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 a three-tier web application. The deployment includes an Application Load Balancer (ALB), an Auto Scaling group, and an Amazon RDS database. The operations team reports that updates to the database security group rules are not being applied correctly during stack updates. The CloudFormation template uses AWS::RDS::DBInstance and AWS::EC2::SecurityGroup resources. What is the most likely cause of this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The DBInstance resource has a DeletionPolicy attribute set to 'Retain', causing CloudFormation to skip updates to dependent resources.
Option A is correct because when a DBInstance resource has a DeletionPolicy set to 'Retain', CloudFormation treats the resource as a 'non-updatable' resource during stack updates. This means CloudFormation will not modify the DBInstance or its dependent resources, such as the security group rules, even if the template changes. The 'Retain' policy prevents CloudFormation from replacing or updating the resource, causing updates to associated security group rules to be silently skipped.
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.
- ✓
The DBInstance resource has a DeletionPolicy attribute set to 'Retain', causing CloudFormation to skip updates to dependent resources.
Why this is correct
When DeletionPolicy is Retain, CloudFormation may not update the DBInstance and its dependencies correctly during updates.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The CloudFormation stack has a stack policy that denies updates to the security group resources.
Why it's wrong here
Stack policies control updates to resources, but security group updates are not typically denied by default.
- ✗
The security group rules are defined inline within the AWS::EC2::SecurityGroup resource, and CloudFormation does not update inline rules after initial creation.
Why it's wrong here
CloudFormation can update inline rules if the template is modified and a stack update is performed.
- ✗
The RDS database is in a VPC that requires a VPC endpoint for CloudFormation to update security groups.
Why it's wrong here
VPC endpoints are not required for CloudFormation to update security groups in the same VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume security group rule updates fail due to inline rule limitations or VPC networking issues, but the real cause is the DeletionPolicy on a dependent resource (DBInstance) that blocks the update chain.
Detailed technical explanation
How to think about this question
The DeletionPolicy attribute in CloudFormation controls what happens when a resource is deleted or replaced during a stack update. When set to 'Retain', CloudFormation will not delete the resource, but it also prevents the resource from being updated or replaced, as replacement requires deletion first. This behavior is documented in the AWS CloudFormation user guide, where resources with a 'Retain' policy are considered 'immutable' for update purposes, causing any changes to the resource or its dependencies to be ignored.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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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Configuration Management and IaC — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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: The DBInstance resource has a DeletionPolicy attribute set to 'Retain', causing CloudFormation to skip updates to dependent resources. — Option A is correct because when a DBInstance resource has a DeletionPolicy set to 'Retain', CloudFormation treats the resource as a 'non-updatable' resource during stack updates. This means CloudFormation will not modify the DBInstance or its dependent resources, such as the security group rules, even if the template changes. The 'Retain' policy prevents CloudFormation from replacing or updating the resource, causing updates to associated security group rules to be silently skipped.
What should I do if I get this DOP-C02 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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: Jun 24, 2026
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.
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