AWS Certified Developer – Associate — Question 198

A developer is building a three-tier application with an Application Load Balancer (ALB), Amazon EC2 instances, and Amazon RDS. There is an alias record in Amazon Route 53 that points to the ALB. When the developer tries to access the ALB from a laptop, the request times out.

Which logs should the developer investigate to verify that the request is reaching the AWS network?

Answer options

• A. VPC Flow Logs
• B. Amazon Route 53 logs
• C. AWS Systems Manager Agent logs
• D. Amazon CloudWatch agent logs

Correct answer: A

Explanation

The correct answer is A, VPC Flow Logs, as they capture the IP traffic going to and from network interfaces in the VPC, allowing the developer to see if the request is reaching the AWS network. Options B, C, and D do not provide visibility into the network traffic flow; Route 53 logs track DNS queries, Systems Manager Agent logs pertain to instance management, and CloudWatch agent logs are for monitoring and logging system metrics, but none directly confirm traffic reaching the ALB.