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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Troubleshooting and Optimization	18%	- Debug and resolve errors 1. Resolve integration and configuration problems 2. Identify and fix code defects - Optimize application performance 1. Optimize resource usage and costs 2. Improve latency and throughput - Troubleshoot application issues 1. Analyze logs, metrics, and traces 2. Use Amazon CloudWatch, AWS X-Ray for monitoring
Deployment	24%	- Prepare application artifacts for deployment 1. Package code and dependencies 2. Use infrastructure as code (AWS CloudFormation, AWS SAM) - Deploy applications on AWS 1. Deploy to AWS Lambda, Amazon EC2, Elastic Beanstalk 2. Perform safe updates and rollbacks - Implement CI/CD pipelines 1. Use AWS CodePipeline, CodeBuild, CodeDeploy 2. Automate deployment and testing workflows
Security	26%	- Implement authentication and authorization 1. Manage IAM roles, policies, and permissions 2. Use Amazon Cognito for identity management - Secure application data 1. Manage secrets and credentials securely 2. Implement encryption at rest and in transit - Apply security best practices 1. Validate application security configurations 2. Follow AWS Well-Architected Framework security principles
Development with AWS Services	32%	- Interact with AWS data services 1. Implement caching and data storage strategies 2. Work with Amazon DynamoDB, Amazon S3 - Write code for applications hosted on AWS 1. Use AWS SDKs and APIs 2. Develop serverless applications 3. Implement architectural patterns - Integrate AWS services into applications 1. Use AWS Lambda, API Gateway, Amazon EventBridge 2. Implement messaging and event-driven workflows

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Amazon AWS Certified Developer - Associate Sample Questions (Q719-Q724):

NEW QUESTION # 719
A developer must use multi-factor authentication (MFA) to access data in an Amazon S3 bucket that is in another AWS account. Which AWS Security Token Service (AWS STS) API operation should the developer use with the MFA information to meet this requirement?

A. AssumeRoleWithWebidentity
B. AssumeRole
C. AssumeRoleWithSAML
D. GetFederationToken

Answer: B

Explanation:
Explanation
The AssumeRole API operation returns a set of temporary security credentials that can be used to access resources in another AWS account. The developer can specify the MFA device serial number and the MFA token code in the request parameters. This option enables the developer to use MFA to access data in an S3 bucket that is in another AWS account. The other options are not relevant or effective for this scenario. References
* AssumeRole
* Requesting Temporary Security Credentials

NEW QUESTION # 720
A company is evaluating whether it can successfully migrate a small HTTP-based service to a serverless architecture to reduce costs. The service runs on an Amazon EC2 instance. The service is written in Java and processes complex data transformations for an ecommerce application. The service runs at unpredictable times to handle incoming requests. The service requires up to 1 minute to process small and large datasets from Amazon RDS.
A developer must determine whether the company can run the service as an AWS Lambda function.
Which solution will meet these requirements?

A. Create an Amazon Cloud Front distribution. Use a Lambda@Edge function with the distribution.
Use CloudFront as the HTTP endpoint for the ecommerce application.
B. Build a Docker container that contains the service code. Use Lambda to host the container on the EC2 instance. Continue to use the EC2 IP address as the HTTP endpoint for the ecommerce application.
C. Create an Amazon CloudFront distribution. Migrate the existing service code to a CloudFront function. Use CloudFront as the HTTP endpoint for the ecommerce application.
D. Create a new Lambda function. Copy the HTTP-based service to the Lambda function. Use the Lambda function's URL as the endpoint for the ecommerce application.

Answer: D

Explanation:
AWS Lambda supports Java runtimes, scales automatically for unpredictable HTTP traffic, and allows execution times of up to 15 minutes, which satisfies the 1-minute processing requirement for complex data transformations. A Lambda function can securely access Amazon RDS and can be directly exposed over HTTP using a Lambda function URL, making it suitable as a cost- effective serverless replacement for an EC2-based service.

NEW QUESTION # 721
An application uses an Amazon EC2 Auto Scaling group. A developer notices that EC2 instances are taking a long time to become available during scale-out events. The UserData script is taking a long time to run.
The developer must implement a solution to decrease the time that elapses before an EC2 instance becomes available. The solution must make the most recent version of the application available at all times and must apply all available security updates. The solution also must minimize the number of images that are created. The images must be validated.
Which combination of steps should the developer take to meet these requirements? (Choose two.)

A. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install all the patches and agents that are needed to manage and run the application. Update the Auto Scaling group launch configuration to use the AMI.
B. Set up AWS CodePipeline to deploy the most recent version of the application at runtime.
C. Remove any commands that perform operating system patching from the UserData script.
D. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install the latest version of the application and all the patches and agents that are needed to manage and run the application. Update the Auto Scaling group launch configuration to use the AMI.
E. Set up AWS CodeDeploy to deploy the most recent version of the application at runtime.

Answer: A,D

NEW QUESTION # 722
A developer is building a web and mobile application for two types of users: regular users and guest users. Regular users are required to log in, but guest users do not log in. Users should see only their data, regardless of whether they authenticate. Users need AWS credentials before they can access AWS resources.

A. Set up an IAM user that has permissions to the required resources. Hardcode the IAM credentials in the web and mobile application.
B. Use an Amazon Cognito identity pool to generate temporary AWS credentials that are linked to an unauthenticated role that has access to the required resources.
C. Generate temporary keys that are stored in AWS KMS. Use the temporary keys to access the required resources.
D. Generate temporary credentials. Store the temporary credentials in AWS Secrets Manager. Use the temporary credentials to access the required resources.

Answer: B

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
* Option A: Amazon Cognito Identity Pool with Unauthenticated Role
* Cognito identity pools can generate temporary AWS credentials for both authenticated and unauthenticated users.
* For guest users, Cognito assigns an unauthenticated role with limited permissions, ensuring secure access to only their resources.
* This is the most secure and efficient solution for managing AWS credentials dynamically without hardcoding or storing them.
* Why Other Options Are Incorrect:
* Option B:Hardcoding IAM credentials in the application is insecure and violates best practices.
* Option C and D:Temporary keys stored in KMS or Secrets Manager require additional implementation overhead and do not inherently manage user-specific access.

NEW QUESTION # 723
A developer is incorporating AWS X-Ray into an application that handles personal identifiable information (PII). The application is hosted on Amazon EC2 instances. The application trace messages include encrypted PII and go to Amazon CloudWatch. The developer needs to ensure that no PII goes outside of the EC2 instances.
Which solution will meet these requirements?

A. Use AWS Distro for Open Telemetry.
B. Use Amazon Macie to detect and hide PII. Call the X-Ray API from AWS Lambda.
C. Manually instrument the X-Ray SDK in the application code.
D. Use the X-Ray auto-instrumentation agent.

Answer: D

NEW QUESTION # 724
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