The answer is that the ELB health check endpoint returns a 503 status code after the new version is deployed. This is correct because Elastic Beanstalk relies on the load balancer’s health check to determine environment health; when the deployed application fails to respond with a 200 OK on the configured health check path, the ELB marks instances as unhealthy, causing the environment to turn red even if the application logs show no errors. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how Elastic Beanstalk integrates with ELB health checks and the distinction between deployment success and post-deployment health—a common trap is assuming that no errors in logs means the application is healthy. Remember that a 503 status from the new version’s endpoint is the culprit, not infrastructure or scaling issues. Memory tip: “Green means 200, Red means 503—check the path, not the logs.”
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 development team uses AWS Elastic Beanstalk to deploy a containerized application. They notice that after a successful deployment, the environment's health turns from Green to Red. The application logs show no errors. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ELB health check endpoint returns a 503 status code after the new version is deployed.
Option B is correct because Elastic Beanstalk uses an ELB health check to determine environment health. If the health check path returns a non-200 status, the environment turns red. Option A is wrong because it would cause deployment failure, not post-deployment health issues. Option C is wrong because it would cause scaling issues, not immediate health change. Option D is wrong because it would affect deployment, not health.
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.
✓
The ELB health check endpoint returns a 503 status code after the new version is deployed.
Why this is correct
Correct because Elastic Beanstalk health is based on ELB health checks.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The deployment failed due to a missing environment variable.
Why it's wrong here
Incorrect because deployment succeeded.
✗
The application's Docker image is not compatible with the platform version.
Why it's wrong here
Incorrect because deployment succeeded.
✗
The Auto Scaling group's minimum instance count is too low.
Why it's wrong here
Incorrect because the environment was Green before.
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 DVA-C02 NAT questions on configuration and troubleshooting.
Deployment — This question tests Deployment — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The ELB health check endpoint returns a 503 status code after the new version is deployed. — Option B is correct because Elastic Beanstalk uses an ELB health check to determine environment health. If the health check path returns a non-200 status, the environment turns red. Option A is wrong because it would cause deployment failure, not post-deployment health issues. Option C is wrong because it would cause scaling issues, not immediate health change. Option D is wrong because it would affect deployment, not health.
What should I do if I get this DVA-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 DVA-C02 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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