The correct answer is to use a stack policy to prevent updates to critical resources and to create a change set before executing the stack update. A stack policy acts as a firewall by explicitly denying update or deletion actions on designated resources, such as production databases or IAM roles, ensuring they remain untouched during any update. A change set, on the other hand, provides a detailed preview of the proposed modifications, flagging any resource replacement or interruption before the update is applied, which directly addresses the risk of unintended changes. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your ability to combine preventive controls with validation steps, often appearing as a scenario where you must choose two complementary strategies from a list that includes tempting but incomplete options like using a service role alone. A common trap is selecting only one safety mechanism, but the exam expects both a policy to block changes and a change set to review them. Memory tip: "Block with a policy, preview with a change set."
DOP-C02 Configuration Management and IaC 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. 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 is adopting Infrastructure as Code (IaC) using AWS CloudFormation. They want to ensure that stack updates are safe and minimize the risk of resource replacement. Which TWO of the following strategies should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Always create a change set before executing a stack update.
Creating a change set before executing a stack update allows you to review the proposed changes, including whether any resources will be replaced or interrupted. This provides a safety net by letting you validate the impact of the update before committing, reducing the risk of unintended resource replacement.
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.
✓
Always create a change set before executing a stack update.
Why this is correct
Change sets allow you to review changes before applying.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use a stack policy to prevent updates to critical resources.
Why this is correct
Stack policies protect resources from accidental updates.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Perform updates directly from the AWS Management Console to see immediate results.
Why it's wrong here
Console updates do not provide a review step.
✗
Delete the stack and create a new one with the updated template.
Why it's wrong here
Deleting and recreating causes downtime.
✗
Use the --disable-rollback flag to avoid unnecessary rollbacks.
Why it's wrong here
Disabling rollback increases risk of failed updates.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the --disable-rollback flag with a safety mechanism, but it actually prevents recovery from failures and does nothing to mitigate resource replacement risks.
Detailed technical explanation
How to think about this question
Change sets in AWS CloudFormation work by comparing the current template with the proposed template and generating a list of resource-level actions (e.g., Modify, Replace, Add, Remove). This allows you to see if a resource will be replaced due to a property that requires replacement (such as an immutable property like the 'PhysicalResourceId' of an AWS::EC2::Instance). Stack policies, on the other hand, use explicit deny statements to prevent updates to specific resources, even if the template attempts to modify them, providing a hard safeguard against unintended changes.
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.
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: Always create a change set before executing a stack update. — Creating a change set before executing a stack update allows you to review the proposed changes, including whether any resources will be replaced or interrupted. This provides a safety net by letting you validate the impact of the update before committing, reducing the risk of unintended resource replacement.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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