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Amazon DVA-C02 exam covers a wide range of AWS services and concepts, including AWS Lambda, AWS Elastic Beanstalk, AWS DynamoDB, AWS Simple Queue Service (SQS), and AWS Simple Notification Service (SNS). DVA-C02 exam also tests a candidate's knowledge of AWS security and compliance, cost optimization, and troubleshooting. DVA-C02 exam consists of 65 multiple-choice and multiple-response questions and must be completed within 130 minutes.

The DVA-C02 Certification Exam evaluates a candidate's ability to design, develop, and deploy scalable and fault-tolerant applications on AWS. DVA-C02 exam covers a wide range of topics, including AWS compute, storage, database, networking, security, and developer tools. DVA-C02 exam also tests the candidate's knowledge of AWS services such as AWS Lambda, AWS Elastic Beanstalk, AWS CodePipeline, AWS CloudFormation, and AWS CloudTrail.

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The DVA-C02 exam covers a broad range of AWS services, including compute, storage, databases, networking, security, and application integration. Candidates are expected to have a solid understanding of AWS services and best practices for designing and deploying applications that are resilient, scalable, and cost-effective. DVA-C02 Exam consists of 65 multiple-choice and multiple-response questions, and candidates have 130 minutes to complete it.

Amazon AWS Certified Developer - Associate Sample Questions (Q250-Q255):

NEW QUESTION # 250
A company's new mobile app uses Amazon API Gateway. As the development team completes a new release of its APIs, a developer must safely and transparently roll out the API change. What is the SIMPLEST solution for the developer to use for rolling out the new API version to a limited number of users through API Gateway?

A. Validate the new API version and promote it to production during the window of lowest expected utilization.
B. Implement an Amazon CloudWatch alarm to trigger a rollback if the observed HTTP 500 status code rate exceeds a predetermined threshold.
C. Create a new API in API Gateway. Direct a portion of the traffic to the new API using an Amazon Route 53 weighted routing policy.
D. Use the canary release deployment option in API Gateway. Direct a percentage of the API traffic using the canarySettings setting.

Answer: D

Explanation:
The canary release deployment option in Amazon API Gateway allows the developer to safely roll out changes to a small percentage of users by configuring the canarySettings. This is the simplest and most direct way to gradually expose users to the new API version without creating a separate API or complex routing logic.

NEW QUESTION # 251
A company uses Amazon DynamoDB as a data store for its order management system. The company frontend application stores orders in a DynamoDB table. The DynamoDB table is configured to send change events to a DynamoDB stream. The company uses an AWS Lambda function to log and process the incoming orders based on data from the DynamoDB stream.
An operational review reveals that the order quantity of incoming orders is sometimes set to 0. A developer needs to create a dashboard that will show how many unique customers this problem affects each day.
What should the developer do to implement the dashboard?

A. Turn on custom Amazon CloudWatch metrics for the DynamoDB stream of the DynamoOB table.Create a CloudWatch alarm that groups the number of unique customers for orders with order quantity equal to 0 in 1-day periods. Add the CloudWatch alarm to a CloudWatch dashboard.
B. Grant the Lambda function's execution role permissions to upload logs to Amazon CloudWatch Logs.
Implement a CloudWatch Logs Insights query that selects the number of unique customers for orders with order quantity equal to 0 and groups the results in 1-day periods. Add the CloudWatch Logs Insights query to a CloudWatch dashboard.
C. Configure the Lambda function to send events to Amazon EventBridge. Create an EventBridge rule that groups the number of unique customers for orders with order quantity equal to 0 in 1-day periods. Add a CloudWatch dashboard as the target of the rule.
D. Use Amazon Athena to query AWS CtoudTrail API logs for API calls. Implement an Athena query that selects the number of unique customers for orders with order quantity equal to 0 and groups the results in 1-day periods. Add the Athena query to an Amazon CloudWatch dashboard.

Answer: B

NEW QUESTION # 252
A company hosts its application on AWS. The application runs on an Amazon Elastic Container Service (Amazon ECS) cluster that uses AWS Fargate. The cluster runs behind an Application Load Balancer The application stores data in an Amazon Aurora database A developer encrypts and manages database credentials inside the application The company wants to use a more secure credential storage method and implement periodic credential rotation.
Which solution will meet these requirements with the LEAST operational overhead?

A. Migrate the credentials to AWS Systems Manager Parameter Store. Encrypt the parameter by using an AWS Key Management Service (AWS KMS) key. Turn on secret rotation. Use 1AM policies and roles to grant Amazon ECS Fargate permissions to access to AWS Secrets Manager
B. Migrate the secret credentials to Amazon RDS parameter groups. Encrypt the parameter by using an AWS Key Management Service (AWS KMS) key Turn on secret rotation. Use 1AM policies and roles to grant AWS KMS permissions to access Amazon RDS.
C. Migrate the credentials to AWS Secrets Manager. Encrypt the credentials by using an AWS Key Management Service (AWS KMS) key Turn on secret rotation Use 1AM policies and roles to grant Amazon ECS Fargate permissions to access to AWS Secrets Manager by using keys.
D. Migrate the credentials to ECS Fargate environment variables. Encrypt the credentials by using an AWS Key Management Service (AWS KMS) key Turn on secret rotation. Use 1AM policies and roles to grant Amazon ECS Fargate permissions to access to AWS Secrets Manager.

Answer: C

Explanation:
* Secrets Management: AWS Secrets Manager is designed specifically for storing and managing sensitive credentials.
* Built-in Rotation: Secrets Manager provides automatic secret rotation functionality, enhancing security posture significantly.
* IAM Integration: IAM policies and roles grant fine-grained access to ECS Fargate, ensuring the principle of least privilege.
* Reduced Overhead: This solution centralizes secrets management and automates rotation, reducing operational overhead compared to the other options.
References:
AWS Secrets Manager: https://aws.amazon.com/secrets-manager/
Secrets Manager Rotation: https://docs.aws.amazon.com/secretsmanager/latest/userguide/rotating-secrets.html IAM for Secrets Manager: https://docs.aws.amazon.com/secretsmanager/latest/userguide/auth-and- access_iam-policies.html

NEW QUESTION # 253
A company runs an AWS CodeBuild project on medium-sized Amazon EC2 instances. The company wants to cost optimize the project and reduce the provisioning time.

A. Configure the project to run on a CodeBuild reserved capacity fleet.
B. Set up Amazon S3 caching for the CodeBuild project.
C. Configure the project to run on a CodeBuild on-demand fleet.
D. Select AWS Lambda as the compute mode for the CodeBuild project.

Answer: B

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
* Option D: Set up Amazon S3 Caching for CodeBuild:
* CodeBuild supports S3 caching to store intermediate build artifacts and dependencies. This reduces the time required to download dependencies during subsequent builds, effectively lowering costs and improving build performance.
* By using S3 caching, developers can optimize costs without changing the compute type or adding complexity.
* Why Other Options Are Incorrect:
* Option A:CodeBuild does not have a "reserved capacity fleet" option.
* Option B:AWS Lambda cannot be used as the compute mode for CodeBuild projects. CodeBuild uses its own managed build environments.
* Option C:CodeBuild already operates on an on-demand basis, so this does not address the need for optimization or reduced provisioning time.
References:
* AWS CodeBuild Caching Documentation

NEW QUESTION # 254
A developer has implemented an AWS Lambda function that inserts new customers into an Amazon RDS database. The function is expected to run hundreds of times each hour. The function and RDS database are in the same VPC. The function is configured to use 512 MB of RAM and is based on the following pseudo code:

After successfully testing the function multiple times, the developer notices that the execution time is longer than expected.
What should the developer do to improve performance?

A. Replace Amazon RDS with Amazon DynamoDB to implement control over the number of writes per second.
B. Move the database connection and close statement out of the handler. Place the connection in the global space.
C. Increase the reserved concurrency of the Lambda function.
D. Increase the size of the RDS database to facilitate an increased number of database connections each hour.

Answer: B

NEW QUESTION # 255
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