- A
Disable the 'Rollback on failure' option and manually revert changes using the AWS Management Console.
Why wrong: Incorrect. Disabling rollback leaves the stack in a failed state; manual revert is error-prone.
- B
Create and execute a change set. If the update fails, the stack remains unchanged.
Correct. Change sets allow you to review changes and execute them; if execution fails, the stack is not modified.
- C
Use AWS Backup to create manual snapshots of all resources before the update.
Why wrong: Incorrect. AWS Backup snapshots are for data recovery, not for infrastructure rollback.
- D
Use nested stacks to isolate changes; if a nested stack fails, the parent stack automatically rolls back.
Why wrong: Incorrect. Nested stacks do not automatically trigger rollback of the parent stack; the parent stack fails without rollback.
- E
Enable the 'Rollback on failure' option in the stack's update settings.
Correct. This causes CloudFormation to automatically roll back the stack to its previous state if the update fails.
Two Key CloudFormation Rollback Strategies for Safe Stack Updates
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 is using AWS CloudFormation to manage its infrastructure. The DevOps team wants to implement a strategy that allows for rollback in case a stack update fails. Which TWO approaches should the team consider? (Choose TWO.)
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
Create and execute a change set. If the update fails, the stack remains unchanged.
Option B is correct because a change set in AWS CloudFormation allows you to preview how proposed changes will affect your stack before executing them. If the update fails after executing the change set, the stack remains in its original state because CloudFormation does not automatically roll back; instead, it leaves the stack unchanged, providing a safe mechanism to avoid partial updates. Option E is correct because enabling 'Rollback on failure' in the stack's update settings instructs CloudFormation to automatically revert the stack to its previous known good state if the update fails, ensuring infrastructure consistency.
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.
- ✗
Disable the 'Rollback on failure' option and manually revert changes using the AWS Management Console.
Why it's wrong here
Incorrect. Disabling rollback leaves the stack in a failed state; manual revert is error-prone.
- ✓
Create and execute a change set. If the update fails, the stack remains unchanged.
Why this is correct
Correct. Change sets allow you to review changes and execute them; if execution fails, the stack is not modified.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Backup to create manual snapshots of all resources before the update.
Why it's wrong here
Incorrect. AWS Backup snapshots are for data recovery, not for infrastructure rollback.
- ✗
Use nested stacks to isolate changes; if a nested stack fails, the parent stack automatically rolls back.
Why it's wrong here
Incorrect. Nested stacks do not automatically trigger rollback of the parent stack; the parent stack fails without rollback.
- ✓
Enable the 'Rollback on failure' option in the stack's update settings.
Why this is correct
Correct. This causes CloudFormation to automatically roll back the stack to its previous state if the update fails.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume nested stacks automatically roll back on failure, but in reality, the parent stack only fails and does not revert the nested stack's changes unless you implement custom rollback logic or use a service like AWS CodePipeline with approval gates.
Detailed technical explanation
How to think about this question
When a CloudFormation stack update fails with 'Rollback on failure' enabled, CloudFormation uses the stack's previous template and parameter values to reapply the last successful state, effectively performing a reverse update. Change sets work by creating a list of resource modifications without executing them; if you execute a change set and the update fails, CloudFormation does not attempt any rollback because the stack was never modified—the execution simply stops at the first error. In real-world scenarios, using change sets for critical production stacks allows teams to validate changes in a sandbox environment first, reducing the risk of failed updates that require rollback.
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.
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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: Create and execute a change set. If the update fails, the stack remains unchanged. — Option B is correct because a change set in AWS CloudFormation allows you to preview how proposed changes will affect your stack before executing them. If the update fails after executing the change set, the stack remains in its original state because CloudFormation does not automatically roll back; instead, it leaves the stack unchanged, providing a safe mechanism to avoid partial updates. Option E is correct because enabling 'Rollback on failure' in the stack's update settings instructs CloudFormation to automatically revert the stack to its previous known good state if the update fails, ensuring infrastructure consistency.
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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Last reviewed: Jul 4, 2026
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