- A
Manually update the resources to match the previous template, then resume the rollback.
Why wrong: Manual intervention is risky; ContinueUpdateRollback is safer.
- B
Use ContinueUpdateRollback to retry the rollback after fixing the resource that caused the failure.
ContinueUpdateRollback is the correct procedure to resolve rollback failures.
- C
Use CloudFormation's 'SignalResource' to manually complete the rollback.
Why wrong: SignalResource is not used for rollback.
- D
Delete the stack and recreate it from the last known good template.
Why wrong: Deletion may fail due to DynamoDB deletion protection or cause data loss.
Question 724 of 1,750
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 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 ContinueUpdateRollback to retry the rollback after fixing the resource that caused the failure.
Option B is correct because ContinueUpdateRollback is the designed CloudFormation operation to retry a failed rollback after fixing the underlying issue, such as DynamoDB deletion protection preventing the table from being deleted during rollback. The engineer can modify the DynamoDB table to disable deletion protection or remove the protection policy, then use ContinueUpdateRollback to complete the rollback. Option A is incorrect because CloudFormation does not support manually updating resources and then resuming rollback; the stack is in a failed state and requires an automated retry. Option C is incorrect because SignalResource is used to signal the creation of resources during a stack operation, not to handle rollback failures. Option D is incorrect because deleting the stack would also attempt to delete the DynamoDB table; despite deletion protection, the deletion may be blocked, causing further failure, and it would also delete other resources, leading to data loss.
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.
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Incident and Event Response — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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 B is correct because ContinueUpdateRollback is the designed CloudFormation operation to retry a failed rollback after fixing the underlying issue, such as DynamoDB deletion protection preventing the table from being deleted during rollback. The engineer can modify the DynamoDB table to disable deletion protection or remove the protection policy, then use ContinueUpdateRollback to complete the rollback. Option A is incorrect because CloudFormation does not support manually updating resources and then resuming rollback; the stack is in a failed state and requires an automated retry. Option C is incorrect because SignalResource is used to signal the creation of resources during a stack operation, not to handle rollback failures. Option D is incorrect because deleting the stack would also attempt to delete the DynamoDB table; despite deletion protection, the deletion may be blocked, causing further failure, and it would also delete other resources, leading to data loss.
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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Last reviewed: Jun 20, 2026
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