This DVA-C02 practice question tests your understanding of deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 has a production environment using AWS Elastic Beanstalk with a multi-container Docker platform. The application consists of a PHP web server and a Redis cache, each running in separate containers. The deployment uses a rolling update policy with a batch size of 1. Recently, during deployments, some users experience intermittent 502 Bad Gateway errors for about 30 seconds. The errors occur when the old containers are terminated and new containers are not yet ready to serve traffic. The development team wants to eliminate this downtime without increasing the deployment time significantly. The team has access to modify the Elastic Beanstalk environment configuration and the Dockerrun.aws.json file. Which action should the team take to resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a health check grace period in the Elastic Beanstalk environment to delay load balancer registration until the containers are healthy.
Option C is correct because adding a health check grace period allows the new instances to stabilize before being registered with the load balancer, preventing 502 errors. Option A is incorrect because increasing the batch size would cause more downtime. Option B is incorrect because switching to all-at-once would cause full downtime. Option D is incorrect because reducing the health check interval would make the load balancer check more frequently, potentially causing premature routing to unhealthy instances.
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.
✗
Increase the batch size to 2 to reduce the number of deployment cycles.
Why it's wrong here
Increasing batch size would cause more instances to be replaced at once, increasing downtime.
✓
Configure a health check grace period in the Elastic Beanstalk environment to delay load balancer registration until the containers are healthy.
Why this is correct
Grace period prevents routing traffic to instances that are not yet healthy.
Related concept
Static NAT maps one inside address to one outside address.
✗
Change the deployment policy to 'All at once' to complete the deployment faster.
Why it's wrong here
All at once would cause complete downtime.
✗
Reduce the health check interval on the load balancer to detect healthy instances faster.
Why it's wrong here
Reducing interval may cause faster detection but does not prevent premature routing.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 a health check grace period in the Elastic Beanstalk environment to delay load balancer registration until the containers are healthy. — Option C is correct because adding a health check grace period allows the new instances to stabilize before being registered with the load balancer, preventing 502 errors. Option A is incorrect because increasing the batch size would cause more downtime. Option B is incorrect because switching to all-at-once would cause full downtime. Option D is incorrect because reducing the health check interval would make the load balancer check more frequently, potentially causing premature routing to unhealthy instances.
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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Question Discussion
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