The answer is to use the ContinueUpdateRollback API to resume the rollback. This is the correct recovery because when a stack enters the UPDATE_ROLLBACK_FAILED state, CloudFormation cannot automatically proceed past the resource that caused the failure. The ContinueUpdateRollback API instructs the service to skip the problematic resources—in this case, the DynamoDB table or Lambda function—and continue rolling back the remaining stack, ultimately bringing it to a consistent UPDATE_ROLLBACK_COMPLETE state without requiring a full stack deletion or manual resource intervention. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of stack failure recovery procedures and the distinction between manual fixes and API-driven recovery. A common trap is attempting to manually delete or modify the failed resources, which can cause further drift; instead, remember that CloudFormation’s built-in rollback continuation is the minimal-disruption path. Memory tip: think “Continue, don’t delete” when you see UPDATE_ROLLBACK_FAILED.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. 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 uses AWS CloudFormation to manage infrastructure. During an update, a stack fails to roll back and is left in UPDATE_ROLLBACK_FAILED state. The stack contains a DynamoDB table and a Lambda function. The operations team needs to fix the stack with minimal disruption. What should they do?
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 API to resume the rollback.
When a CloudFormation stack is in UPDATE_ROLLBACK_FAILED state, the recommended recovery action is to use the ContinueUpdateRollback API (or the AWS Management Console equivalent). This API instructs CloudFormation to skip the resources that failed to roll back and continue rolling back the remaining resources, bringing the stack to a consistent UPDATE_ROLLBACK_COMPLETE state. This approach minimizes disruption because it does not require deleting the stack or manually intervening with the DynamoDB table or Lambda function.
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.
✗
Manually delete the DynamoDB table and then retry the stack update.
Why it's wrong here
Manual deletion may cause data loss and does not resolve the rollback state.
✗
Delete the stack and recreate it from the template.
Why it's wrong here
Deleting the stack removes all resources, including the DynamoDB table with data.
✓
Use the ContinueUpdateRollback API to resume the rollback.
Why this is correct
This allows CloudFormation to retry rolling back the failed resource.
Related concept
Read the scenario before looking for a memorised answer.
✗
Update the stack again with a different change set to bypass the failed resource.
Why it's wrong here
Updating again is not possible while the stack is in UPDATE_ROLLBACK_FAILED state.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the only way to recover from a failed rollback is to delete the stack or manually fix the resource, but AWS provides the ContinueUpdateRollback API specifically to handle this state with minimal disruption.
Detailed technical explanation
How to think about this question
The ContinueUpdateRollback API works by analyzing the stack's current state and the resources that failed to roll back. It then performs a targeted rollback of the remaining resources, skipping the specific resource that caused the failure (e.g., a DynamoDB table that could not be deleted due to ongoing operations). Under the hood, CloudFormation uses a state machine to track resource transitions; the UPDATE_ROLLBACK_FAILED state indicates that the rollback process encountered an unrecoverable error, and ContinueUpdateRollback allows the engine to mark the failed resource as 'skip' and proceed. In real-world scenarios, this is critical when a resource like a DynamoDB table has deletion protection enabled or is in use by another service, and manual intervention would be disruptive.
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.
Operations and Maintenance — This question tests Operations and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the ContinueUpdateRollback API to resume the rollback. — When a CloudFormation stack is in UPDATE_ROLLBACK_FAILED state, the recommended recovery action is to use the ContinueUpdateRollback API (or the AWS Management Console equivalent). This API instructs CloudFormation to skip the resources that failed to roll back and continue rolling back the remaining resources, bringing the stack to a consistent UPDATE_ROLLBACK_COMPLETE state. This approach minimizes disruption because it does not require deleting the stack or manually intervening with the DynamoDB table or Lambda function.
What should I do if I get this PAS-C01 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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Question Discussion
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