The answer is to use the ContinueUpdateRollback operation to fix the resource that caused the failure. This is correct because the UPDATE_ROLLBACK_FAILED error means CloudFormation successfully detected a failed update but was itself unable to undo the partial changes, leaving the stack in an inconsistent state. By initiating a continue rollback, you instruct CloudFormation to retry the rollback process, or you can manually resolve the specific resource issue first, allowing the stack to reach a stable, known state. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of stack recovery mechanisms and the importance of maintaining infrastructure consistency under failure conditions. A common trap is assuming you must delete the stack to start fresh, but that risks data loss in resources like databases or S3 buckets. Another pitfall is trying to push another update, which compounds the inconsistency. Memory tip: think "Rollback Failed = Rollback Again" — the solution is always to continue the rollback, not to delete or ignore.
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. 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 deploy infrastructure. A stack update fails with the error 'UPDATE_ROLLBACK_FAILED'. What should the engineer do to resolve this?
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 fix the resource that caused the failure.
Option B is correct because a rollback failure indicates that CloudFormation could not undo some changes. Continuing the rollback process or manually fixing the resource allows the stack to reach a consistent state. Option A is wrong because deleting the stack may cause data loss. Option C is wrong because ignoring may leave the stack in an inconsistent state. Option D is wrong because updating again may compound the issue.
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.
✗
Retry the stack update with the same parameters.
Why it's wrong here
Retrying will likely fail again.
✗
Delete the stack and recreate it.
Why it's wrong here
Deleting may cause data loss and is not the first recommended action.
✗
Ignore the error and continue using the stack.
Why it's wrong here
The stack is in a failed state and should be resolved.
✓
Use the 'ContinueUpdateRollback' operation to fix the resource that caused the failure.
Why this is correct
This operation allows CloudFormation to complete the rollback.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Incident and Event Response — This question tests Incident and Event Response — 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 fix the resource that caused the failure. — Option B is correct because a rollback failure indicates that CloudFormation could not undo some changes. Continuing the rollback process or manually fixing the resource allows the stack to reach a consistent state. Option A is wrong because deleting the stack may cause data loss. Option C is wrong because ignoring may leave the stack in an inconsistent state. Option D is wrong because updating again may compound the issue.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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