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The AWS Certified Developer - Associate exam is an essential certification for developers who want to demonstrate their expertise in developing and deploying applications on the AWS platform. AWS Certified Developer - Associate certification can help candidates advance their careers and open up new opportunities in the field of cloud computing.

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Amazon DVA-C02 (AWS Certified Developer - Associate) Certification Exam is an industry-recognized certification for developers who have expertise in building and deploying applications on the Amazon Web Services (AWS) platform. AWS Certified Developer - Associate certification exam validates the candidate's ability to design, develop, and maintain applications on AWS, and it is intended for professionals who have a minimum of one year of experience in developing and maintaining AWS-based applications.

Amazon AWS Certified Developer - Associate Sample Questions (Q423-Q428):

NEW QUESTION # 423
A company built an online event platform For each event the company organizes quizzes and generates leaderboards that are based on the quiz scores. The company stores the leaderboard data in Amazon DynamoDB and retains the data for 30 days after an event is complete The company then uses a scheduled job to delete the old leaderboard data The DynamoDB table is configured with a fixed write capacity. During the months when many events occur, the DynamoDB write API requests are throttled when the scheduled delete job runs.
A developer must create a long-term solution that deletes the old leaderboard data and optimizes write throughput Which solution meets these requirements?

A. Use DynamoDB Streams to schedule and delete the leaderboard data
B. Configure a TTL attribute for the leaderboard data
C. Set a higher write capacity when the scheduled delete job runs
D. Use AWS Step Functions to schedule and delete the leaderboard data.

Answer: B

Explanation:
* DynamoDB TTL (Time-to-Live): A native feature that automatically deletes items after a specified expiration time.
* Efficiency: Eliminates the need for scheduled deletion jobs, optimizing write throughput by avoiding potential throttling conflicts.
* Seamless Integration: TTL works directly within DynamoDB, requiring minimal development overhead.
References:
DynamoDB TTL Documentation: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.
html

NEW QUESTION # 424
A company needs to set up secure database credentials for all its AWS Cloud resources. The company's resources include Amazon RDS DB instances Amazon DocumentDB clusters and Amazon Aurora DB instances. The company's security policy mandates that database credentials be encrypted at rest and rotated at a regular interval.
Which solution will meet these requirements MOST securely?

A. Set up IAM database authentication for token-based access. Generate user tokens to provide centralized access to RDS DB instances. Amazon DocumentDB clusters and Aurora DB instances.
B. Store the database access credentials as an encrypted Amazon S3 object in an S3 bucket Block all public access on the S3 bucket. Use S3 server-side encryption to set up automatic rotation on the encryption key.
C. Create parameters for the database credentials in AWS Systems Manager Parameter Store Set the Type parameter to Secure Sting. Set up automatic rotation on the parameters.
D. Create an AWS Lambda function by using the SecretsManagerRotationTemplate template in the AWS Secrets Manager console. Create secrets for the database credentials in Secrets Manager Set up secrets rotation on a schedule.

Answer: D

Explanation:
Explanation
This solution will meet the requirements by using AWS Secrets Manager, which is a service that helps protect secrets such as database credentials by encrypting them with AWS Key Management Service (AWS KMS) and enabling automatic rotation of secrets. The developer can create an AWS Lambda function by using the SecretsManagerRotationTemplate template in the AWS Secrets Manager console, which provides a sample code for rotating secrets for RDS DB instances, Amazon DocumentDB clusters, and Amazon Aurora DB instances. The developer can also create secrets for the database credentials in Secrets Manager, which encrypts them at rest and provides secure access to them. The developer can set up secrets rotation on a schedule, which changes the database credentials periodically according to a specified interval or event.
Option A is not optimal because it will set up IAM database authentication for token-based access, which may not be compatible with all database engines and may require additional configuration and management of IAM roles or users. Option B is not optimal because it will create parameters for the database credentials in AWS Systems Manager Parameter Store, which does not support automatic rotation of secrets. Option C is not optimal because it will store the database access credentials as an encrypted Amazon S3 object in an S3 bucket, which may introduce additional costs and complexity for accessing and securing the data.
References: [AWS Secrets Manager], [Rotating Your AWS Secrets Manager Secrets]

NEW QUESTION # 425
A company is using AWS CloudFormation to deploy a two-tier application. The application will use Amazon RDS as its backend database. The company wants a solution that will randomly generate the database password during deployment. The solution also must automatically rotate the database password without requiring changes to the application.
What is the MOST operationally efficient solution that meets these requirements'?

A. Use an AWS Systems Manager Parameter Store resource with the SecureString data type to generate and rotate the password.
B. Use a cron daemon on the application s host to generate and rotate the password.
C. Use an AWS Secrets Manager resource to generate and rotate the password.
D. Use an AWS Lambda function as a CloudFormation custom resource to generate and rotate the password.

Answer: C

Explanation:
Explanation
This solution will meet the requirements by using AWS Secrets Manager, which is a service that helps protect secrets such as database credentials by encrypting them with AWS Key Management Service (AWS KMS) and enabling automatic rotation of secrets. The developer can use an AWS Secrets Manager resource in AWS CloudFormation template, which enables creating and managing secrets as part of a CloudFormation stack.
The developer can use an AWS::SecretsManager::Secret resource type to generate and rotate the password for accessing RDS database during deployment. The developer can also specify a RotationSchedule property for the secret resource, which defines how often to rotate the secret and which Lambda function to use for rotation logic. Option A is not optimal because it will use an AWS Lambda function as a CloudFormation custom resource, which may introduce additional complexity and overhead for creating and managing a custom resource and implementing rotation logic. Option B is not optimal because it will use an AWS Systems Manager Parameter Store resource with the SecureString data type, which does not support automatic rotation of secrets. Option C is not optimal because it will use a cron daemon on the application's host to generate and rotate the password, which may incur more costs and require more maintenance for running and securing a host.
References: [AWS Secrets Manager], [AWS::SecretsManager::Secret]

NEW QUESTION # 426
A developer created several AWS Lambda functions that write data to a single Amazon S3 bucket. The developer configured all the Lambda functions to send logs and metrics to Amazon CloudWatch.
The developer receives reports that one of the Lambda functions writes data to the bucket very slowly. The developer needs to measure the latency between the problematic Lambda function and the S3 bucket.
Which solution will meet this requirement?

A. Query the Lambda function's log file in Amazon CloudWatch Logs Insights. Return the average of the auto-discovered duration field.
B. Enable AWS X-Ray on the Lambda function. Select Amazon S3 in the latency graph to view the latency histogram.
C. Enable AWS X-Ray on the Lambda function. In the generated trace map. select the line between Lambda and Amazon S3.
D. Enable CloudWatch Lambda Insights on the function. View the latency graph that CloudWatch Lambda Insights provides.

Answer: C

NEW QUESTION # 427
A banking company is building an application for users to create accounts, view balances, and review recent transactions. The company integrated an Amazon API Gateway REST API with AWS Lambda functions. The company wants to deploy a new version of a Lambda function that gives customers the ability to view their balances. The new version of the function displays customer transaction insights.
The company wants to test the new version with a small group of users before deciding whether to make the feature available for all users. Which solution will meet these requirements with the LEAST disruption to users?

A. Deploy the new version of the function to a new stage in the REST API. Route traffic to the new stage.
If the new version fails, route traffic to the original stage.
B. Create a new REST API stage for the new version of the function. Create a weighted alias record set in Amazon Route 53 to distribute traffic between the original stage and the new stage.
C. Create a canary deployment for the REST API. Gradually increase traffic to the new version of the function. Revert traffic to the old version if issues are detected.
D. Redeploy the REST API stage to use the new version of the function. If issues are detected, update the REST API to point to the previous version of the function.

Answer: C

Explanation:
API Gateway'scanary deploymentsallow gradual traffic shifting to a new version of a function, minimizing disruption while testing.
* Why Option A is Correct:
* Gradual Rollout: Reduces risk by incrementally increasing traffic.
* Rollback Support: Canary deployments make it easy to revert to the previous version.
* Why Not Other Options:
* Option B: Redeploying the stage disrupts all users.
* Option C & D: Managing new stages and weighted routing introduces unnecessary complexity.

NEW QUESTION # 428
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