← DOP-C02·Amazon Web Services

Question 1,702 of 1,750

Configuration Management and IaC →mediumMultiple ChoiceObjective-mapped

Using CloudFormation DeletionPolicy Retain to Safeguard Stateful Resources

This DOP-C02 practice question tests your understanding of configuration management and iac. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 manage its infrastructure. The DevOps team wants to ensure that critical resources, such as an RDS database, are not accidentally deleted when a stack is updated or deleted. Which CloudFormation feature should be used to prevent this?

A
DeletionPolicy attribute with Retain
DeletionPolicy with Retain preserves the resource when the stack is deleted.
B
Stack policy
Why wrong: Stack policy controls update operations, not deletion behavior.
C
Termination protection
Why wrong: Termination protection is an EC2-specific feature; CloudFormation does not have a native termination protection for all resources.
D
DependsOn attribute
Why wrong: DependsOn only ensures resource creation order; it does not prevent deletion.

Full breakdown with real-world context →

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

✓

DeletionPolicy attribute with Retain

The DeletionPolicy attribute with the Retain value is the correct choice because it explicitly instructs CloudFormation to preserve the physical resource (e.g., an RDS database) when its corresponding logical resource is deleted from the stack template during an update or when the entire stack is deleted. This prevents accidental deletion of critical stateful resources by ensuring the resource remains in the AWS account even after the stack operation completes.

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.

✓
DeletionPolicy attribute with Retain
Why this is correct
DeletionPolicy with Retain preserves the resource when the stack is deleted.
Related concept
Read the scenario before looking for a memorised answer.
✗
Stack policy
Why it's wrong here
Stack policy controls update operations, not deletion behavior.
✗
Termination protection
Why it's wrong here
Termination protection is an EC2-specific feature; CloudFormation does not have a native termination protection for all resources.
✗
DependsOn attribute
Why it's wrong here
DependsOn only ensures resource creation order; it does not prevent deletion.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse termination protection (an EC2-specific feature) with CloudFormation's DeletionPolicy, or mistakenly think a stack policy can prevent deletion during a full stack deletion, when it only restricts update operations.

Detailed technical explanation

How to think about this question

Under the hood, the DeletionPolicy attribute is evaluated at the end of a stack deletion or when a resource is removed from the template during an update. If set to Retain, CloudFormation skips the physical resource deletion API call (e.g., DeleteDBInstance for RDS) and simply removes the logical resource from the stack metadata. A real-world scenario is when a team accidentally removes an RDS resource from a template during a stack update; without Retain, the database is immediately deleted, but with Retain, the database survives and must be manually cleaned up or re-imported into the stack.

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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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: DeletionPolicy attribute with Retain — The DeletionPolicy attribute with the Retain value is the correct choice because it explicitly instructs CloudFormation to preserve the physical resource (e.g., an RDS database) when its corresponding logical resource is deleted from the stack template during an update or when the entire stack is deleted. This prevents accidental deletion of critical stateful resources by ensuring the resource remains in the AWS account even after the stack operation completes.

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.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Same concept, more angles

2 more ways this is tested on DOP-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company uses AWS CloudFormation to manage infrastructure. They have a stack that creates an Amazon RDS DB instance and an EC2 instance that connects to it. The DB instance has a deletion policy of 'Retain'. The stack fails to delete because the DB instance is retained and still exists. Which TWO actions would allow the stack to be deleted successfully? (Select TWO.)

medium

A.Use the AWS CLI to force delete the stack with the --force option.
✓ B.Manually delete the DB instance using the RDS console.
C.Disable termination protection on the EC2 instance.
✓ D.Change the deletion policy of the DB instance to 'Delete' and then update the stack before deleting.
E.Modify the DB instance to allow deletion by setting DeletionProtection to false.

Why B: Option B is correct because manually deleting the retained DB instance removes the resource that is blocking the stack deletion. CloudFormation cannot delete a stack that contains a resource with a 'Retain' deletion policy until that resource is manually removed, as the stack expects the resource to no longer exist for the deletion to complete.

Variation 2. A company uses AWS CloudFormation to manage infrastructure. They have a template that creates an Amazon RDS DB instance. The template includes a 'DeletionPolicy' attribute set to 'Retain' on the DB instance resource. The DevOps team deletes the stack. Later, they notice that the DB instance still exists and is incurring costs. What is the MOST cost-effective way to remove the DB instance?

hard

A.Create a new CloudFormation stack that includes the same DB instance but with a DeletionPolicy of 'Delete', then delete that stack.
✓ B.Manually delete the DB instance using the AWS Management Console or AWS CLI.
C.Use the 'aws cloudformation delete-change-set' command to remove the resource.
D.Update the stack: change the DeletionPolicy to 'Delete' and then delete the stack again.

Why B: Option B is correct because the DB instance was created with a DeletionPolicy of 'Retain', which explicitly instructs CloudFormation to preserve the resource when the stack is deleted. Once the stack is deleted, CloudFormation no longer manages the DB instance, so the only way to remove it and stop costs is to manually delete it via the AWS Management Console or AWS CLI. This is the most cost-effective approach as it directly addresses the orphaned resource without unnecessary overhead.

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