The correct approach is to create a new Elastic Beanstalk environment and swap the environment CNAMEs. This works because Elastic Beanstalk provides a built-in CNAME swap feature that instantly redirects traffic from the blue environment to the green environment at the DNS level, effectively achieving zero-downtime blue/green deployment without modifying the underlying infrastructure. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of Elastic Beanstalk’s native deployment mechanisms versus external tools like CodeDeploy or manual load balancer changes—a common trap is confusing the CNAME swap with a rolling update or target group swap, which are not true blue/green strategies. Remember: Elastic Beanstalk’s CNAME swap is the only native blue/green method; think “swap the name, not the game” to avoid overcomplicating the answer.
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 company uses AWS Elastic Beanstalk for deploying a web application. The development team wants to implement a blue/green deployment strategy to minimize downtime. Which approach should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a new Elastic Beanstalk environment and swap the environment CNAMEs.
Option D is correct because Elastic Beanstalk supports blue/green deployments by swapping CNAME records between two environments. Option A is wrong because Elastic Beanstalk does not natively use CodeDeploy for blue/green; it has its own swap method. Option B is wrong because updating the Auto Scaling group is not a blue/green approach. Option C is wrong because updating the load balancer target group is more of a rolling update.
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.
✗
Update the Auto Scaling group launch configuration and gradually replace instances.
Why it's wrong here
That is a rolling update, not blue/green.
✗
Create a new CodeDeploy deployment group and use the blue/green deployment configuration.
Why it's wrong here
CodeDeploy is not integrated with Elastic Beanstalk for blue/green.
✓
Create a new Elastic Beanstalk environment and swap the environment CNAMEs.
Why this is correct
Elastic Beanstalk provides environment swapping for blue/green.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a new target group and register instances from the old environment.
Why it's wrong here
This does not leverage Elastic Beanstalk's blue/green feature.
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: Create a new Elastic Beanstalk environment and swap the environment CNAMEs. — Option D is correct because Elastic Beanstalk supports blue/green deployments by swapping CNAME records between two environments. Option A is wrong because Elastic Beanstalk does not natively use CodeDeploy for blue/green; it has its own swap method. Option B is wrong because updating the Auto Scaling group is not a blue/green approach. Option C is wrong because updating the load balancer target group is more of a rolling update.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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