The correct answer is to configure the CodeDeploy deployment group to enable load balancer deregistration and re-registration. This ensures zero downtime during an in-place deployment by having CodeDeploy first deregister each EC2 instance from the Application Load Balancer, allowing existing connections to drain, then deploying the new application version, and finally re-registering the healthy instance so traffic resumes seamlessly. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how to combine in-place deployments with ALB connection draining to avoid service interruption—a common trap is assuming that simply increasing the minimum healthy hosts percentage is enough, but that only controls the number of available instances, not the traffic routing. A useful memory tip is "Deregister, Deploy, Re-register" (DDR), which captures the three-step flow that keeps your application available throughout the update.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. 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 developer is deploying a web application on Amazon EC2 instances behind an Application Load Balancer (ALB). The developer uses AWS CodeDeploy to deploy new application versions. The deployment group is configured with an in-place deployment. The developer wants to ensure that the deployment does not cause any downtime. Which additional configuration is required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the CodeDeploy deployment group to enable load balancer deregistration and re-registration.
Option B is correct because using a load balancer with in-place deployment, CodeDeploy can register instances with the load balancer and deregister them before deployment, then re-register after. This minimizes downtime. Option A is wrong because creating an Auto Scaling group is not necessary; the deployment can work with existing instances. Option C is wrong because using blue/green deployment is an alternative, but the question specifically asks for in-place. Option D is wrong because increasing the minimum healthy hosts percentage helps but does not eliminate downtime if instances are not properly drained.
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.
✗
Change the deployment type to blue/green deployment.
Why it's wrong here
Blue/green would eliminate downtime, but the question asks for in-place configuration.
✗
Set the minimum healthy hosts percentage to 100%.
Why it's wrong here
This ensures all instances are healthy at the end, but during deployment, some instances may be down.
✓
Configure the CodeDeploy deployment group to enable load balancer deregistration and re-registration.
Why this is correct
This ensures traffic is routed away from instances being updated, preventing downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create an Auto Scaling group and configure the deployment to use a rolling update.
Why it's wrong here
Auto Scaling group with rolling update is an alternative, but not required for in-place with ALB.
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: Configure the CodeDeploy deployment group to enable load balancer deregistration and re-registration. — Option B is correct because using a load balancer with in-place deployment, CodeDeploy can register instances with the load balancer and deregister them before deployment, then re-register after. This minimizes downtime. Option A is wrong because creating an Auto Scaling group is not necessary; the deployment can work with existing instances. Option C is wrong because using blue/green deployment is an alternative, but the question specifically asks for in-place. Option D is wrong because increasing the minimum healthy hosts percentage helps but does not eliminate downtime if instances are not properly drained.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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