- A
Use a ChangeSet with Replacement set to False
Using a ChangeSet is the correct approach because it allows you to preview the change and see that the instance type change requires replacement. However, the option's wording 'Replacement set to False' is not a real parameter; the value of using a ChangeSet is in the preview, not in blocking replacement.
- B
Use a CreationPolicy with a Timeout
Why wrong: A CreationPolicy defines a timeout for resource creation, not for updates. It does not help in updating an instance type.
- C
Use a DeletionPolicy with Retain
Why wrong: A DeletionPolicy determines what happens when a resource is deleted from the stack (e.g., snapshot or retain). It has no effect on updates.
- D
Use an UpdatePolicy with AutoScalingRollingUpdate
Why wrong: The AutoScalingRollingUpdate policy is only applicable to Auto Scaling groups. The question does not mention an Auto Scaling group, so this option is incorrect for a standalone EC2 instance.
DOP-C02 ChangeSet Practice Question
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. A key principle to apply: changeSet. 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 Operations team needs to update a stack that contains an EC2 instance. They want to change the instance type from t2.micro to t2.small without recreating the instance. Which CloudFormation stack update policy should they use?
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
Use a ChangeSet with Replacement set to False
The correct answer is A because using a ChangeSet allows previewing changes, and although 'Replacement set to False' is not a real parameter, reviewing a ChangeSet helps identify that changing the instance type for a standalone EC2 instance requires replacement. No update policy can achieve this without recreation, so the best option is to use a ChangeSet to verify the impact. Options B, C, and D are irrelevant—CreationPolicy is for resource creation, DeletionPolicy handles deletion, and AutoScalingRollingUpdate applies only to Auto Scaling groups, not standalone instances.
Key principle: ChangeSet
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a ChangeSet with Replacement set to False
Why this is correct
Using a ChangeSet is the correct approach because it allows you to preview the change and see that the instance type change requires replacement. However, the option's wording 'Replacement set to False' is not a real parameter; the value of using a ChangeSet is in the preview, not in blocking replacement.
Related concept
ChangeSet
- ✗
Use a CreationPolicy with a Timeout
Why it's wrong here
A CreationPolicy defines a timeout for resource creation, not for updates. It does not help in updating an instance type.
- ✗
Use a DeletionPolicy with Retain
Why it's wrong here
A DeletionPolicy determines what happens when a resource is deleted from the stack (e.g., snapshot or retain). It has no effect on updates.
- ✗
Use an UpdatePolicy with AutoScalingRollingUpdate
Why it's wrong here
The AutoScalingRollingUpdate policy is only applicable to Auto Scaling groups. The question does not mention an Auto Scaling group, so this option is incorrect for a standalone EC2 instance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is to assume that an UpdatePolicy like AutoScalingRollingUpdate can be applied to standalone instances. In reality, it only works for Auto Scaling groups, so candidates mistakenly select D.
Detailed technical explanation
How to think about this question
When updating an EC2 instance type in CloudFormation, the `AWS::EC2::Instance` resource typically requires replacement (stop and start) unless the instance is part of an Auto Scaling group. The `UpdatePolicy` attribute with `AutoScalingRollingUpdate` is specifically designed for Auto Scaling groups, allowing CloudFormation to perform a rolling update by terminating and launching new instances with the updated configuration, which can include changing the instance type without manual intervention. Under the hood, CloudFormation uses the Auto Scaling group's `UpdatePolicy` to orchestrate the update in batches, respecting health checks and cooldown periods to maintain availability.
KKey Concepts to Remember
- ChangeSet
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
ChangeSet
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. ChangeSet 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.
Review changeSet, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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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 — ChangeSet.
What is the correct answer to this question?
The correct answer is: Use a ChangeSet with Replacement set to False — The correct answer is A because using a ChangeSet allows previewing changes, and although 'Replacement set to False' is not a real parameter, reviewing a ChangeSet helps identify that changing the instance type for a standalone EC2 instance requires replacement. No update policy can achieve this without recreation, so the best option is to use a ChangeSet to verify the impact. Options B, C, and D are irrelevant—CreationPolicy is for resource creation, DeletionPolicy handles deletion, and AutoScalingRollingUpdate applies only to Auto Scaling groups, not standalone instances.
What should I do if I get this DOP-C02 question wrong?
Review changeSet, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
ChangeSet
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Last reviewed: Jul 4, 2026
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