The answer is to use ContinueUpdateRollback after fixing the resource that caused the failure. This is the correct approach because when a stack enters the UPDATE_ROLLBACK_FAILED state, CloudFormation cannot automatically revert changes due to a blocking issue—such as DynamoDB deletion protection preventing table removal. By resolving the underlying problem (e.g., temporarily disabling deletion protection) and then calling ContinueUpdateRollback, the service safely retries the rollback process, restoring the stack to its last stable state. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of stack recovery mechanisms and common pitfalls like deletion protection. A frequent trap is assuming you must delete and recreate the stack, which risks data loss or further failures. Instead, remember that ContinueUpdateRollback is the native, automated recovery command—think of it as “fix the blocker, then let CloudFormation finish the rollback.” A useful memory tip: “Don’t delete to retreat; continue to complete.”
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 runs a critical application on EC2 instances behind an Application Load Balancer. The application is deployed across three Availability Zones. The DevOps team uses AWS CloudFormation to manage the infrastructure. During a recent deployment, a stack update failed, and the stack entered a ROLLBACK_IN_PROGRESS state. However, the rollback also failed, leaving the stack in UPDATE_ROLLBACK_FAILED state. The engineer needs to restore the application to a working state. The stack includes an Auto Scaling group, an ALB, security groups, and a DynamoDB table. The DynamoDB table is defined with deletion protection enabled. The engineer is considering the following actions: A) ContinueUpdateRollback to retry the rollback, fixing the resource that caused the failure. B) Delete the stack and recreate it from the last known good template. C) Use CloudFormation's 'SignalResource' to manually complete the rollback. D) Manually update the resources to match the previous template, then resume the rollback. Which action should the engineer take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use ContinueUpdateRollback to retry the rollback after fixing the resource that caused the failure.
Option A is correct because ContinueUpdateRollback is the designed method to resolve a rollback failure. The engineer can fix the underlying issue (e.g., DynamoDB deletion protection preventing table deletion) and then retry the rollback. Option B is wrong because deleting the stack would also delete the DynamoDB table (deletion protection may prevent deletion, causing further issues). Option C is wrong because SignalResource is for signaling creation of resources, not for rollback. Option D is wrong because manually updating resources is error-prone and not recommended; ContinueUpdateRollback automates the process.
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 update the resources to match the previous template, then resume the rollback.
Why it's wrong here
Manual intervention is risky; ContinueUpdateRollback is safer.
✓
Use ContinueUpdateRollback to retry the rollback after fixing the resource that caused the failure.
Why this is correct
ContinueUpdateRollback is the correct procedure to resolve rollback failures.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use CloudFormation's 'SignalResource' to manually complete the rollback.
Why it's wrong here
SignalResource is not used for rollback.
✗
Delete the stack and recreate it from the last known good template.
Why it's wrong here
Deletion may fail due to DynamoDB deletion protection or cause data loss.
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
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.
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 ContinueUpdateRollback to retry the rollback after fixing the resource that caused the failure. — Option A is correct because ContinueUpdateRollback is the designed method to resolve a rollback failure. The engineer can fix the underlying issue (e.g., DynamoDB deletion protection preventing table deletion) and then retry the rollback. Option B is wrong because deleting the stack would also delete the DynamoDB table (deletion protection may prevent deletion, causing further issues). Option C is wrong because SignalResource is for signaling creation of resources, not for rollback. Option D is wrong because manually updating resources is error-prone and not recommended; ContinueUpdateRollback automates the process.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.