AWS Certified Developer – Associate — Practice Exam

Question 1

MiraTech is deploying a new microservices-based app on AWS. The dev team wants to minimize server management overhead and scale automatically based on API request volume. Given this situation, which AWS service should they choose to implement the backend logic with minimal infrastructure management?

Accepted Answer

AWS Lambda functions triggered by API Gateway

Answer

AWS Elastic Beanstalk running Node.js

Answer

Amazon EC2 Auto Scaling group with Docker containers

Answer

An Amazon ECS cluster with Fargate launch type

Question 2

LumaToys stores user data in DynamoDB and wants to ensure that only application servers with a specific IAM role can write data during business hours (9 AM–5 PM UTC). Which AWS feature should a developer implement to enforce this policy automatically?

Accepted Answer

Use an IAM policy with a condition key limiting access based on the current time

Answer

Configure a DynamoDB table-level access policy with AWS Config rules

Answer

Attach a Lambda function that triggers on writes and rejects requests outside of business hours

Answer

Set up VPC endpoint policies restricting access based on source IP addresses

Question 3

GameGrid is developing a new leaderboard feature using AWS SDK for JavaScript v3. Their backend code frequently calls multiple AWS services including DynamoDB and SNS. To improve response times, what practice should the developer adopt when initializing AWS service clients?

Accepted Answer

Reuse a single client instance for each AWS service throughout the application

Answer

Create one client instance per API request and pass it to all service calls

Answer

Instantiate new clients inside each function that makes AWS calls

Answer

Use AWS SDK v2 instead as it manages client instances automatically

Question 4

In the context of AWS Lambda, a developer at Finova notices that some function invocations timeout unpredictably when processing large JSON payloads from API Gateway. Given that the function has sufficient memory allocated, what is the most likely cause and best next step to troubleshoot?

Accepted Answer

API Gateway payload size exceeds Lambda limits; reduce payload size or use S3 for large data

Answer

The Lambda function’s code has an infinite loop; the developer should review the code logic

Answer

The IAM role lacks permissions to read the JSON payload, causing timeout

Answer

Lambda concurrency limits are reached; increase reserved concurrency

Question 5

At DataPulse Inc., developers want to build a CI/CD pipeline that automatically deploys updated AWS Lambda functions when code is pushed to a GitHub repository. Which AWS service combination enables the cleanest integration of code commits triggering Lambda deployments?

Accepted Answer

AWS CodePipeline with GitHub source and AWS CodeDeploy deployment actions

Answer

AWS CloudFormation with CloudTrail events on GitHub commits

Answer

Amazon EventBridge receiving GitHub webhook events that invoke Lambda update scripts

Answer

AWS Elastic Beanstalk linked to GitHub for Lambda deployments

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