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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Troubleshooting and Optimization	18%	- Assist in a root cause analysis 1. AWS CloudTrail 2. Error handling and retries 3. Application logging 4. AWS X-Ray 5. Amazon CloudWatch Logs - Instrument code for observability 1. Custom metrics 2. Structured logging 3. Amazon CloudWatch metrics 4. Amazon CloudWatch alarms 5. AWS X-Ray - Optimize applications by using AWS services and features 1. Cost optimization 2. Data storage optimization 3. Concurrency and throttling 4. Memory and compute optimization 5. Caching strategies (ElastiCache, CloudFront)
Topic 2: Deployment	24%	- Deploy code by using AWS CI/CD services 1. Canary deployments 2. Rolling deployments 3. AWS CodePipeline 4. Blue/green deployments 5. AWS CodeDeploy 6. GitHub integration 7. AWS CodeCommit 8. AWS CodeBuild - Prepare application artifacts to be deployed to AWS 1. AWS CloudFormation 2. AWS SAM 3. AWS CDK 4. Docker containers 5. Lambda deployment packages - Test applications in development environments 1. AWS SAM local 2. Mocking AWS services 3. Local testing of Lambda functions - Automate deployment testing 1. AWS CodePipeline 2. AWS CodeDeploy 3. AWS CodeCommit 4. AWS CodeBuild
Topic 3: Security	26%	- Implement encryption by using AWS services 1. AWS KMS 2. AWS Secrets Manager 3. AWS CloudHSM 4. AWS Certificate Manager 5. Amazon S3 encryption - Implement authentication and/or authorization for applications and AWS services 1. Identity federation (SAML, OpenID Connect, Amazon Cognito) 2. Bearer tokens (JWT, OAuth, AWS STS) 3. User pools and identity pools in Amazon Cognito 4. Resource-based policies, service policies, and principal policies 5. Role-based access control (RBAC) - Manage sensitive data in application code 1. AWS Secrets Manager 2. AWS Systems Manager Parameter Store 3. Encryption of data at rest and in transit 4. Environment variables
Topic 4: Development with AWS Services	32%	- Develop code for AWS serverless applications 1. Amazon EventBridge 2. AWS Step Functions 3. AWS AppSync 4. Amazon API Gateway - Develop code for applications hosted on AWS 1. AWS CloudFormation 2. Amazon DynamoDB 3. AWS CLI 4. AWS SDKs 5. AWS Lambda 6. Amazon SNS 7. Amazon Cognito 8. Amazon API Gateway 9. Amazon SQS 10. Amazon S3 - Use data stores in application development 1. Amazon EFS 2. Amazon DynamoDB 3. Amazon ElastiCache 4. Amazon RDS 5. Amazon S3

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Amazon AWS Certified Developer - Associate Sample Questions (Q226-Q231):

NEW QUESTION # 226
A developer is working on an ecommerce platform that communicates with several third-party payment processing APIs The third-party payment services do not provide a test environment.
The developer needs to validate the ecommerce platform's integration with the third-party payment processing APIs. The developer must test the API integration code without invoking the third-party payment processing APIs.
Which solution will meet these requirements'?

A. Set up an Amazon API Gateway REST API for each third-party API Specify an integration request type of Mock Configure integration responses by using sample responses captured from the real third-party API
B. Create an AWS Lambda function for each third-party API. Embed responses captured from the real third-party API. Configure Amazon Route 53 Resolver with an inbound endpoint for each Lambda function's Amazon Resource Name (ARN).
C. Set up an Amazon API Gateway REST API with a gateway response configured for status code 200 Add response templates that contain sample responses captured from the real third-party API.
D. Set up an AWS AppSync GraphQL API with a data source configured for each third-party API Specify an integration type of Mock Configure integration responses by using sample responses captured from the real third-party API.

Answer: A

Explanation:
Explanation
Amazon API Gateway can mock responses for testing purposes without requiring any integration backend.
This allows the developer to test the API integration code without invoking the third-party payment processing APIs. The developer can configure integration responses by using sample responses captured from the real third-party API. References:
* Mocking Integration Responses in API Gateway
* Set up Mock Integrations for an API in API Gateway

NEW QUESTION # 227
A developer has a financial application. The application uses AWS Secrets Manager to manage an Amazon RDS for PostgreSQL database's username and password. The developer needs to rotate the password while maintaining the application's high availability. Which solution will meet these requirements with LEAST development effort?

A. Rotate the secret by using multivalue answer rotation. Update the application with an appropriate retry strategy to handle authentication failures.
B. Rotate the secret by using the alternating-users rotation strategy. Update the application with an appropriate retry strategy to handle authentication failures.
C. Use the PostgreSQL client to create a new database username and password. Include the new secret values by performing an immediate rotation. Use the AWS CLI to update the RDS database password. Perform an immediate rotation of the Secrets Manager secrets.
D. Rotate the secret by using the single-user rotation strategy. Update the application with an appropriate retry strategy to handle authentication failures.

Answer: D

Explanation:
Using the single-user rotation strategy in AWS Secrets Manager is the simplest and most automated approach for rotating RDS credentials. Secrets Manager handles updating the secret and synchronizing it with the database. With a retry strategy in the application to handle any brief authentication failures during rotation, this solution provides high availability with minimal development effort.

NEW QUESTION # 228
A team of developed is using an AWS CodePipeline pipeline as a continuous integration and continuous delivery (CI/CD) mechanism for a web application. A developer has written unit tests to programmatically test the functionality of the application code. The unit tests produce a test report that shows the results of each individual check. The developer now wants to run these tests automatically during the CI/CD process.

A. Add a new stage to the pipeline. Use AWS CodeBuild at the provider. Add the new stage before the stage that deploys code revisions to the test environment. Write a buildspec that fails the CodeBuild stage it any test does not pass. Use the test reports feature of CodeBuild to integrate the report with the CodeBuild console. View the test results in codeBuild Resolve any issues.
B. Write a Git pre-commit hook that runs the test before every commit. Ensure that each developer who is working on the project has the pre-commit hook instated locally. Review the test report and resolve any issues before pushing changes to AWS CodeCommit.
C. Add a new stage to the pipeline. Use Jenkins as the provider. Configure CodePipeline to use Jenkins to run the unit tests. Write a Jenkinsfile that fails the stage if any test does not pass. Use the test report plugin for Jenkins to integrate the repot with the Jenkins dashboard. View the test results in Jenkins.Resolve any issues.
D. Add a new stage to the pipeline. Use AWS CodeBuild as the provider. Add the new stage after the stage that deploys code revisions to the test environment. Write a buildspec that fails the CodeBuild stage if any test does not pass. Use the test reports feature of Codebuild to integrate the report with the CodoBuild console. View the test results in CodeBuild Resolve any issues.

Answer: A

Explanation:
The solution that will meet the requirements is to add a new stage to the pipeline. Use AWS CodeBuild as the provider. Add the new stage before the stage that deploys code revisions to the test environment. Write a buildspec that fails the CodeBuild stage if any test does not pass. Use the test reports feature of CodeBuild to integrate the report with the CodeBuild console. View the test results in CodeBuild. Resolve any issues. This way, the developer can run the unit tests automatically during the CI/CD process and catch any bugs before deploying to the test environment. The developer can also use the test reports feature of CodeBuild to view and analyze the test results in a graphical interface. The other options either involve running the tests manually, running them after deployment, or using a different provider that requires additional configuration and integration.
Reference: Test reports for CodeBuild

NEW QUESTION # 229
A developer has a legacy application that is hosted on-premises. Other applications hosted on AWS depend on the on-premises application for proper functioning. In case of any application errors, the developer wants to be able to use Amazon CloudWatch to monitor and troubleshoot all applications from one place.
How can the developer accomplish this?

A. Download the CloudWatch agent to the on-premises server. Configure the agent to use IAM user credentials with permissions for CloudWatch.
B. Install an AWS SDK on the on-premises server to automatically send logs to CloudWatch.
C. Upload log files from the on-premises server to Amazon S3 and have CloudWatch read the files.
D. Upload log files from the on-premises server to an Amazon EC2 instance and have the instance forward the logs to CloudWatch.

Answer: A

Explanation:
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/Install-CloudWatch- Agent.html
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/install-CloudWatch-Agent- on-premise.html

NEW QUESTION # 230
A company wants to launch a REST API across multiple environments. The company needs to configure staging testing, and production environments.
The configuration must provide built-in support for version control. The team must be able to promote the test environment to the production environment when required.
Which solution will meet these requirements in the MOST operationally efficient way?

A. Identify the API methods required for the configuration. Create an AWS Lambda function for each required API method. Use Lambda canary deployments with a weighted alias for new releases and version control.
B. Use Amazon API Gateway to create a REST API. Set up an API method for each environment.
Deploy the REST API Associate the REST API deployment with the appropriate method.
C. Use Amazon API Gateway to create a REST API Set up an API method for each environment.Deploy the REST API and associate the deployment with the appropriate stage.
D. Create a REST API for each environment in Amazon API Gateway. Deploy the APIs and distribute the URL of the API to the corresponding users.

Answer: C

Explanation:
Amazon API Gateway stages provide separate staging, testing, and production environments for the same REST API. Each stage can reference a specific immutable API deployment, which provides deployment versioning and enables a tested deployment to be promoted to production efficiently.

NEW QUESTION # 231
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