- A
Execute a new stack update with the same template
Why wrong: The stack must first be moved out of UPDATE_ROLLBACK_FAILED state.
- B
Manually increase the Auto Scaling group capacity in the affected AZ
Why wrong: This might not resolve the rollback state; the stack is still in a failed state.
- C
Use the ContinueUpdateRollback operation to skip the resources that failed
This allows you to resume the rollback and skip the resources that caused the failure.
- D
Delete the Auto Scaling group and recreate it
Why wrong: This is not a best practice and may cause data loss.
Question 505 of 1,750
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 DevOps engineer is troubleshooting a CloudFormation stack that is in UPDATE_ROLLBACK_FAILED state. The stack attempted to update an Auto Scaling group but failed due to insufficient capacity in the Availability Zone. What is the recommended next step?
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 the ContinueUpdateRollback operation to skip the resources that failed
When a CloudFormation stack is in UPDATE_ROLLBACK_FAILED state, the recommended next step is to use the ContinueUpdateRollback operation with the 'ResourcesToSkip' parameter to skip the resources that failed during rollback. This allows CloudFormation to complete the rollback of the remaining resources and move the stack to a stable state, after which you can investigate and fix the underlying issue (e.g., insufficient capacity in the AZ) before attempting the update again. Option C directly aligns with AWS documentation for handling this specific stack state.
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.
- ✗
Execute a new stack update with the same template
Why it's wrong here
The stack must first be moved out of UPDATE_ROLLBACK_FAILED state.
- ✗
Manually increase the Auto Scaling group capacity in the affected AZ
Why it's wrong here
This might not resolve the rollback state; the stack is still in a failed state.
- ✓
Use the ContinueUpdateRollback operation to skip the resources that failed
Why this is correct
This allows you to resume the rollback and skip the resources that caused the failure.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Delete the Auto Scaling group and recreate it
Why it's wrong here
This is not a best practice and may cause data loss.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think manually fixing the underlying issue (e.g., increasing capacity) is sufficient to resolve the rollback failure, but they overlook that CloudFormation requires an explicit ContinueUpdateRollback API call to exit the UPDATE_ROLLBACK_FAILED state, even after the root cause is addressed.
Detailed technical explanation
How to think about this question
The ContinueUpdateRollback operation allows you to skip specific resources that failed during rollback, such as an Auto Scaling group that cannot be rolled back due to capacity constraints. Under the hood, CloudFormation marks the skipped resources as 'UPDATE_COMPLETE' (or retains their current state) and proceeds to roll back other resources, enabling the stack to reach a consistent state. This is particularly useful in scenarios where the failed resource is non-critical or can be manually corrected later, avoiding a full stack deletion.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Use the ContinueUpdateRollback operation to skip the resources that failed — When a CloudFormation stack is in UPDATE_ROLLBACK_FAILED state, the recommended next step is to use the ContinueUpdateRollback operation with the 'ResourcesToSkip' parameter to skip the resources that failed during rollback. This allows CloudFormation to complete the rollback of the remaining resources and move the stack to a stable state, after which you can investigate and fix the underlying issue (e.g., insufficient capacity in the AZ) before attempting the update again. Option C directly aligns with AWS documentation for handling this specific stack state.
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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