- A
Use a deployment configuration with a high minimum healthy host percentage.
Why wrong: Incorrect: Not directly for rollback.
- B
Create a CloudWatch alarm based on the ELB health check metric.
Correct: Alarm can trigger rollback.
- C
Configure the deployment group to automatically roll back when a deployment fails.
Correct: Enables automatic rollback on failure.
- D
Configure the Auto Scaling group to use an ELB health check with a sufficient grace period.
Correct: Ensures health check is properly configured.
- E
Store the deployment artifacts in an S3 bucket with versioning enabled.
Why wrong: Incorrect: Not related to rollback.
Question 143 of 1,750
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 is using AWS CodeDeploy to deploy an application to an Auto Scaling group. The deployment is failing because the new instances are not passing the health checks. The team wants to automatically roll back the deployment if health checks fail. Which THREE steps should the team 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
✓
Create a CloudWatch alarm based on the ELB health check metric.
Option B is correct because creating a CloudWatch alarm based on the ELB health check metric allows you to monitor the health of instances in the Auto Scaling group. When the alarm triggers due to failed health checks, it can be used in conjunction with an automatic rollback configuration to revert the deployment to the previous revision. This ensures that unhealthy instances are detected early and the deployment is rolled back automatically, minimizing downtime.
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.
- ✗
Use a deployment configuration with a high minimum healthy host percentage.
Why it's wrong here
Incorrect: Not directly for rollback.
- ✓
Create a CloudWatch alarm based on the ELB health check metric.
Why this is correct
Correct: Alarm can trigger rollback.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure the deployment group to automatically roll back when a deployment fails.
Why this is correct
Correct: Enables automatic rollback on failure.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure the Auto Scaling group to use an ELB health check with a sufficient grace period.
Why this is correct
Correct: Ensures health check is properly configured.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Store the deployment artifacts in an S3 bucket with versioning enabled.
Why it's wrong here
Incorrect: Not related to rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think that simply enabling automatic rollback on deployment failure (Option C) is sufficient, but they miss that you must also configure a CloudWatch alarm (Option B) to detect health check failures that occur after the deployment completes, because a deployment can succeed initially but then fail health checks later.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy automatic rollback is triggered by either a deployment failure or a CloudWatch alarm. When you configure a CloudWatch alarm on the ELB health check metric (e.g., UnHealthyHostCount), the alarm state change (to ALARM) can be used as a trigger for CodeDeploy to automatically roll back the deployment to the last known good revision. This is particularly useful in blue/green deployments where new instances are registered with the ELB and health checks are critical for traffic routing. A real-world scenario is when a new application version introduces a bug that causes the ELB health check to fail; the CloudWatch alarm fires, and CodeDeploy rolls back the deployment without manual intervention, preserving application availability.
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.
TExam Day Tips
- 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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a CloudWatch alarm based on the ELB health check metric. — Option B is correct because creating a CloudWatch alarm based on the ELB health check metric allows you to monitor the health of instances in the Auto Scaling group. When the alarm triggers due to failed health checks, it can be used in conjunction with an automatic rollback configuration to revert the deployment to the previous revision. This ensures that unhealthy instances are detected early and the deployment is rolled back automatically, minimizing downtime.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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