- A
Set the 'Rollback on failure' option to 'Yes' in the CloudFormation stack properties.
This ensures automatic rollback to the last known good state on update failure.
- B
Enable termination protection on the CloudFormation stack.
Termination protection prevents accidental stack deletion, adding resilience.
- C
Configure an SNS topic as a notification target in the CloudFormation stack.
CloudFormation can send stack events (including rollback) to SNS for email/SMS notifications.
- D
Create a CloudWatch Logs log group and subscribe to stack events.
Why wrong: CloudWatch Logs can capture logs but not trigger rollback or notifications directly.
- E
Enable drift detection on the CloudFormation stack.
Why wrong: Drift detection identifies manual changes but does not trigger rollback.
Quick Answer
The correct combination includes configuring an SNS topic as a notification target in the CloudFormation stack, enabling rollback on failure, and optionally enabling termination protection. This works because CloudFormation’s stack update behavior can be set to automatically revert to the previous known good state when an update fails, and by attaching an SNS topic to the stack, all state transitions—including rollback initiation and completion—are published as events to that topic, which can then deliver email or other notifications. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of CloudFormation’s native notification integration versus separate logging or monitoring services; a common trap is confusing CloudWatch Logs or drift detection with rollback triggers. Remember that SNS is the notification backbone for CloudFormation lifecycle events, while rollback is a stack-level property. A useful memory tip: “Rollback and notify—SNS is the ally.”
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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. The DevOps team wants to ensure that if a stack update fails, the stack automatically rolls back to the previous known good state. The team also wants to receive notifications of the rollback. Which combination of steps should the team take? (Choose THREE.)
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
Set the 'Rollback on failure' option to 'Yes' in the CloudFormation stack properties.
Option A is correct because CloudFormation stack updates can be configured with a rollback on failure. Option B is correct because CloudFormation can send events to Amazon SNS, which can then trigger notifications (e.g., email). Option C is correct because enabling termination protection prevents accidental deletion of the stack. Option D (CloudWatch Logs) is for logging, not rollback. Option E (drift detection) is for detecting manual changes, not rollback.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set the 'Rollback on failure' option to 'Yes' in the CloudFormation stack properties.
Why this is correct
This ensures automatic rollback to the last known good state on update failure.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Enable termination protection on the CloudFormation stack.
Why this is correct
Termination protection prevents accidental stack deletion, adding resilience.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Configure an SNS topic as a notification target in the CloudFormation stack.
Why this is correct
CloudFormation can send stack events (including rollback) to SNS for email/SMS notifications.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Create a CloudWatch Logs log group and subscribe to stack events.
Why it's wrong here
CloudWatch Logs can capture logs but not trigger rollback or notifications directly.
- ✗
Enable drift detection on the CloudFormation stack.
Why it's wrong here
Drift detection identifies manual changes but does not trigger rollback.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
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Resilient Cloud Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set the 'Rollback on failure' option to 'Yes' in the CloudFormation stack properties. — Option A is correct because CloudFormation stack updates can be configured with a rollback on failure. Option B is correct because CloudFormation can send events to Amazon SNS, which can then trigger notifications (e.g., email). Option C is correct because enabling termination protection prevents accidental deletion of the stack. Option D (CloudWatch Logs) is for logging, not rollback. Option E (drift detection) is for detecting manual changes, not rollback.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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