Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A developer is deploying a new version of a web application to an EC2 Auto Scaling group using AWS CodeDeploy with a blue/green deployment strategy. The Auto Scaling group is associated with an Application Load Balancer (ALB). The developer wants to ensure that the new instances are registered with the ALB and pass health checks before any traffic is routed to them. Which CodeDeploy configuration should the developer use?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Set the 'Reroute traffic to replacement instances' to 'Immediately'.
This shifts traffic to the new instances immediately without waiting for health checks, which could route requests to unhealthy instances and cause errors.
B
Distractor review
Set the 'Reroute traffic to replacement instances' to 'Wait for time' and specify a wait time.
This waits for a fixed duration before rerouting traffic, but does not guarantee that instances have passed health checks; they might still be unhealthy after the wait period.
C
Best answer
Set the 'Reroute traffic to replacement instances' to 'Wait for health check' and specify the ELB health check.
This configuration ensures that new instances must pass the ELB health check before traffic is rerouted, meeting the requirement of routing traffic only to healthy instances.
D
Distractor review
Set the deployment to terminate the original instances before rerouting traffic.
Terminating original instances before rerouting traffic would cause downtime because no instances are available to serve traffic during the transition.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related DVA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a REST API using Amazon API Gateway that will serve static content from an Amazon S3 bucket. The API should cache responses for frequently accessed objects to reduce latency. Which API Gateway feature should the developer enable?
Question 2
A developer is running a web application on multiple Amazon EC2 instances behind an Application Load Balancer (ALB). The application needs to store user session state that must be available across all instances. The session data is small and temporary but must survive individual instance failures. Which AWS service should the developer use to store this session state?
Question 3
A developer has an AWS Lambda function that processes messages from an Amazon SQS standard queue. The function is idempotent and currently has a batch size of 10. The developer wants to increase throughput and increases the batch size to 100. After the change, CloudWatch metrics show a significant increase in throttles and the queue backlog is growing. The function's reserved concurrency is set to 10. What is the most effective action to resolve the throttling and improve throughput?
Question 4
A developer is managing an application running on Amazon EC2 instances behind an Application Load Balancer. Users report that the application becomes unresponsive after several hours, and restarting the instance temporarily fixes the issue. The developer suspects a memory leak but cannot add custom instrumentation. Which AWS service can collect memory utilization metrics and help identify the memory leak with minimal configuration?
Question 5
A developer is building a serverless web application using AWS Lambda and Amazon DynamoDB. The application needs to perform complex aggregations on data stored in DynamoDB. Which AWS service should the developer use to perform these aggregations efficiently without reading all the data into Lambda?
Question 6
A developer has an Amazon S3 bucket containing private user documents. The application must generate a time-limited URL for users to download their own documents without requiring the users to have AWS credentials. Which solution should the developer use?
FAQ
Questions learners often ask
What does this DVA-C02 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Set the 'Reroute traffic to replacement instances' to 'Wait for health check' and specify the ELB health check. — In AWS CodeDeploy blue/green deployments for EC2, the traffic rerouting behavior can be configured. Setting 'Reroute traffic to replacement instances' to 'Wait for health check' ensures that new instances must pass the specified health check (e.g., ELB health check) before traffic is shifted. This prevents routing requests to unhealthy instances, ensuring zero downtime. The other options either shift traffic immediately (which could cause errors if instances are not ready), use a fixed time delay (which may not account for actual health), or terminate original instances prematurely.
What should I do if I get this DVA-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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