- A
AWS CodePipeline with ECS rolling update and manual rollback.
Why wrong: Rolling update may cause downtime; manual rollback is not automatic.
- B
AWS CodeDeploy with ECS blue/green deployment and CloudWatch alarms for automatic rollback.
Blue/green provides zero-downtime; CloudWatch alarm triggers automatic rollback.
- C
AWS Elastic Beanstalk with rolling deployment and enhanced health reporting.
Why wrong: Elastic Beanstalk is for single-container environments, not microservices.
- D
AWS CloudFormation with ECS service update and SNS notification on failure.
Why wrong: CloudFormation does not provide automatic rollback based on health checks.
Question 1,496 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 DevOps team is implementing a CI/CD pipeline for a microservices architecture on AWS ECS. They want to ensure zero-downtime deployments and automatic rollback if health checks fail. Which combination of services should they use?
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
✓
AWS CodeDeploy with ECS blue/green deployment and CloudWatch alarms for automatic rollback.
Option B is correct because AWS CodeDeploy supports blue/green deployments for ECS, which creates a new replacement task set alongside the original, allowing traffic to shift only after health checks pass. CloudWatch alarms can be configured to trigger an automatic rollback if the new deployment fails health checks, ensuring zero-downtime and automated recovery.
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.
- ✗
AWS CodePipeline with ECS rolling update and manual rollback.
Why it's wrong here
Rolling update may cause downtime; manual rollback is not automatic.
- ✓
AWS CodeDeploy with ECS blue/green deployment and CloudWatch alarms for automatic rollback.
Why this is correct
Blue/green provides zero-downtime; CloudWatch alarm triggers automatic rollback.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Elastic Beanstalk with rolling deployment and enhanced health reporting.
Why it's wrong here
Elastic Beanstalk is for single-container environments, not microservices.
- ✗
AWS CloudFormation with ECS service update and SNS notification on failure.
Why it's wrong here
CloudFormation does not provide automatic rollback based on health checks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume AWS CodePipeline with rolling update (Option A) can handle automatic rollback, but CodePipeline itself does not manage deployment strategies or health-check-based rollbacks—those are handled by CodeDeploy, which is specifically designed for blue/green deployments with automatic rollback capabilities.
Detailed technical explanation
How to think about this question
AWS CodeDeploy for ECS uses a blue/green deployment model where the 'blue' (original) task set remains active until the 'green' (new) task set passes all configured health checks, at which point traffic is shifted using the ECS service's load balancer target group. The automatic rollback is triggered by CloudWatch alarms monitoring metrics like TargetResponseTime or HTTP 5xx errors, and CodeDeploy reverts to the original task set by re-routing traffic, ensuring zero-downtime during the rollback process.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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: AWS CodeDeploy with ECS blue/green deployment and CloudWatch alarms for automatic rollback. — Option B is correct because AWS CodeDeploy supports blue/green deployments for ECS, which creates a new replacement task set alongside the original, allowing traffic to shift only after health checks pass. CloudWatch alarms can be configured to trigger an automatic rollback if the new deployment fails health checks, ensuring zero-downtime and automated recovery.
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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