The correct choice is to use CodeDeploy with a CloudWatch alarm on the ALB error rate that triggers a deployment rollback. This works because CodeDeploy natively integrates with CloudWatch alarms to monitor post-deployment metrics—such as the HTTP error rate from the ALB—and automatically initiates a rollback if the alarm state is breached within the specified evaluation period. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of automated deployment safety mechanisms and the principle of minimizing operational overhead by leveraging managed services rather than custom scripts. A common trap is to over-engineer with Lambda functions or manual approvals, but the exam rewards the simplest, most resilient integration. Memory tip: think “Alarm = Auto-Rollback” for CodeDeploy—if the error rate spikes, the alarm flips and the deployment flips back.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 web application on EC2 instances behind an Application Load Balancer (ALB). During a recent deployment, users experienced errors. The team wants to automatically roll back the deployment if the error rate exceeds 5% within 10 minutes after deployment. Which solution meets these requirements with minimal operational overhead?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use CodeDeploy with a CloudWatch alarm on the ALB error rate that triggers a deployment rollback.
Option D is correct because AWS CodeDeploy supports automatic rollback based on CloudWatch alarm metrics, such as error rate, with minimal overhead. Option A is wrong because manual approval does not trigger automatic rollback. Option B is wrong because Lambda functions add complexity and are not the best practice for automatic rollback. Option C is wrong because modifying ASG health checks does not directly monitor error rate for rollback.
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.
✗
Configure the Auto Scaling group to use ELB health checks and replace instances if the error rate increases.
Why it's wrong here
Auto Scaling health checks do not monitor error rate percentages for rollback.
✗
Use CodeDeploy with manual approval gates and a script that checks error rates.
Why it's wrong here
Manual approval does not provide automatic rollback based on error rate.
✓
Use CodeDeploy with a CloudWatch alarm on the ALB error rate that triggers a deployment rollback.
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 SAP-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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use CodeDeploy with a CloudWatch alarm on the ALB error rate that triggers a deployment rollback. — Option D is correct because AWS CodeDeploy supports automatic rollback based on CloudWatch alarm metrics, such as error rate, with minimal overhead. Option A is wrong because manual approval does not trigger automatic rollback. Option B is wrong because Lambda functions add complexity and are not the best practice for automatic rollback. Option C is wrong because modifying ASG health checks does not directly monitor error rate for rollback.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-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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