The answer is to use a blue/green deployment with a Classic Load Balancer and swap environment URLs. This configuration is correct because Elastic Beanstalk’s blue/green deployment with a Classic Load Balancer supports gradual traffic shifting by allowing you to swap the CNAME records between two environments or adjust DNS weights, enabling a controlled migration of traffic from the old (blue) environment to the new (green) one. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of deployment strategies that minimize downtime and support rapid rollback—a common trap is confusing rolling or immutable updates with true blue/green, but remember that only the URL swap method gives you both a full staging environment and the ability to instantly revert by swapping back. A helpful memory tip: “Swap the CNAME, shift the traffic, rollback is just a flip.”
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 implementing a blue/green deployment strategy for a microservice hosted on AWS Elastic Beanstalk. They want to minimize downtime and be able to quickly roll back in case of issues. The deployment must support traffic shifting gradually. Which configuration 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
✓
Use a blue/green deployment with a Classic Load Balancer and swap environment URLs.
Option B is correct because Elastic Beanstalk blue/green deployments with a Classic Load Balancer allow traffic shifting by swapping environment URLs or adjusting DNS weights. Option A is wrong because rolling updates are not blue/green. Option C is wrong because immutable updates replace all instances at once, not gradual. Option D is wrong because canary deployments are not natively supported by Elastic Beanstalk without additional tools.
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.
✗
Use immutable updates with a fixed percentage of instances.
Why it's wrong here
Immutable updates launch a full new set of instances, not gradual.
✓
Use a blue/green deployment with a Classic Load Balancer and swap environment URLs.
Why this is correct
Blue/green with URL swap allows gradual traffic shifting and quick rollback.
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.
✗
Use rolling updates with a batch size of 100%.
Why it's wrong here
Rolling updates replace instances incrementally but are not blue/green.
✗
Use canary deployments by configuring the Elastic Load Balancer listener rules.
Why it's wrong here
Elastic Beanstalk does not natively support canary deployments.
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: Use a blue/green deployment with a Classic Load Balancer and swap environment URLs. — Option B is correct because Elastic Beanstalk blue/green deployments with a Classic Load Balancer allow traffic shifting by swapping environment URLs or adjusting DNS weights. Option A is wrong because rolling updates are not blue/green. Option C is wrong because immutable updates replace all instances at once, not gradual. Option D is wrong because canary deployments are not natively supported by Elastic Beanstalk without additional tools.
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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