The answer is AWS CodeDeploy with ECS blue/green deployment and CloudWatch alarms for automatic rollback. This combination is correct because CodeDeploy orchestrates the blue/green deployment by shifting traffic from the existing (blue) task set to the new (green) task set, ensuring zero-downtime ECS deployment as the new service remains behind the load balancer throughout the transition. CloudWatch alarms monitor the health checks on the green environment; if they breach a threshold, CodeDeploy automatically triggers a rollback to the blue environment, preserving application availability. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of deployment strategies and integrated rollback mechanisms—a common trap is choosing CodePipeline alone, which lacks native rollback logic, or relying solely on ECS service auto-scaling. Remember the mnemonic: “Blue-Green, Alarms Lean”—CodeDeploy handles the traffic shift, CloudWatch alarms decide whether to keep or revert.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 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 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.
CodeDeploy with ECS blue/green deployment and CloudWatch alarms for rollback provides zero-downtime and automatic rollback. Option B is correct.
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.
✗
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.
Static NAT maps one inside address to one outside address.
✗
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: 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.
SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..
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. — CodeDeploy with ECS blue/green deployment and CloudWatch alarms for rollback provides zero-downtime and automatic rollback. Option B is correct.
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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Question Discussion
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