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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q195-Q200):

NEW QUESTION # 195
A company is developing a serverless multi-tier application on AWS. The company will build the serverless logic tier by using Amazon API Gateway and AWS Lambda.
While the company builds the logic tier, a developer who works on the frontend of the application must develop integration tests. The tests must cover both positive and negative scenarios, depending on success and error HTTP status codes.
Which solution will meet these requirements with the LEAST effort?

A. Create two mock integration resources for API methods in API Gateway. In the integration request, return a success HTTP status code for one resource and an error HTTP status code for the other resource. In the integration response, add messages that correspond to the HTTP status codes.
B. Create Lambda functions to perform tests. Add simple logic to return either success or error, based on the HTTP status codes. Build an API Gateway Lambda integration. Select appropriate Lambda functions that correspond to the HTTP status codes.
C. Create a Lambda function to perform tests. Add simple logic to return either success or error- based HTTP status codes. Create a mock integration in API Gateway. Select the Lambda function that corresponds to the HTTP status codes.
D. Set up a mock integration for API methods in API Gateway. In the integration request from Method Execution, add simple logic to return either a success or error based on HTTP status code. In the integration response, add messages that correspond to the HTTP status codes.

Answer: D

Explanation:
"API Gateway supports mock integrations for API methods"
"As an API developer, you decide how API Gateway responds to a mock integration request. For this, you configure the method's integration request and integration response to associate a response with a given status code. "
https://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-mock-integration.html

NEW QUESTION # 196
A developer is running an application on an Amazon EC2 instance. When the application attempts to read from an Amazon S3 bucket, the request fails. The developer determines that the IAM role associated with the EC2 instance is missing the required Amazon S3 read permissions.
The developer must grant the application access to read from the S3 bucket with the LEAST application disruption.
Which solution will meet this requirement?

A. Add the permission to the S3 bucket and restart the EC2 instance.
B. Add the permission to the IAM role. Hibernate and restart the EC2 instance.
C. Add the permission to the IAM role so that the change takes effect automatically.
D. Add the permission to the IAM role. Terminate the EC2 instance and launch a new instance.

Answer: C

Explanation:
AWS IAM role permissions are evaluated dynamically. According to AWS documentation, when an IAM role attached to an EC2 instance is updated, the updated permissions are available to applications running on that instance without requiring a restart. The EC2 instance retrieves temporary credentials through the instance metadata service, and those credentials are refreshed automatically.
In this scenario, the least disruptive approach is to update the IAM role policy to include the required s3:
GetObject permission. Once the permission is added, the application can immediately retry access to the S3 bucket without restarting, stopping, or terminating the EC2 instance.
Terminating or restarting the instance (Options A and C) introduces unnecessary downtime and operational overhead. Modifying the S3 bucket policy (Option D) is unnecessary because the problem lies with missing role permissions, not bucket access configuration.
AWS best practices strongly recommend using IAM roles for EC2 and updating permissions dynamically to avoid service interruption. Therefore, simply adding the required permission to the role is the correct and most efficient solution.

NEW QUESTION # 197
A company is offering APIs as a service over the internet to provide unauthenticated read access to statistical information that is updated daily. The company uses Amazon API Gateway and AWS Lambda to develop the APIs. The service has become popular, and the company wants to enhance the responsiveness of the APIs.
Which action can help the company achieve this goal?

A. Enable cross-origin resource sharing (CORS) for the APIs.
B. Configure usage plans and API keys in API Gateway.
C. Enable API caching in API Gateway.
D. Configure API Gateway to use an interface VPC endpoint.

Answer: C

Explanation:
Explanation
Amazon API Gateway is a service that enables developers to create, publish, maintain, monitor, and secure APIs at any scale. The developer can enable API caching in API Gateway to cache responses from the backend integration point for a specified time-to-live (TTL) period. This can improve the responsiveness of the APIs by reducing the number of calls made to the backend service.
References:
[What Is Amazon API Gateway? - Amazon API Gateway]
[Enable API Caching to Enhance Responsiveness - Amazon API Gateway]

NEW QUESTION # 198
A developer compiles an AWS Lambda function and packages the result as a .zip file. The developer uses the Functions page on the Lambda console to attempt to upload the local packaged .zip file. When pushing the package to Lambda, the console returns the following error:

Which solutions can the developer use to publish the code? (Choose two.)

A. Sign the .zip file digitally. Create a new Lambda function by using the Lambda console. Update the configuration of the new Lambda function to include the Amazon Resource Name (ARN) of the code signing configuration.
B. Create an AWS Support ticket to increase the maximum package size.
C. Upload the package to Amazon 3. Use the Functions page on the Lambda console to upload the package from the S3 location.
D. Use the update-function-code AWS CLI command. Pass the --publish parameter.
E. Repackage the Lambda function as a Docker container image. Upload the image to Amazon Elastic Container Registry (Amazon ECR). Create a new Lambda function by using the Lambda console. Reference the image that is deployed to Amazon ECR.

Answer: C,E

NEW QUESTION # 199
A developer is deploying a new application to Amazon Elastic Container Service (Amazon ECS). The developer needs to securely store and retrieve different types of variables. These variables include authentication information for a remote API, the URL for the API, and credentials. The authentication information and API URL must be available to all current and future deployed versions of the application across development, testing, and production environments.
How should the developer retrieve the variables with the FEWEST application changes?

A. Update the application to retrieve the variables from each of the deployed environments. Define the authentication information and API URL in the ECS task definition as unique names during the deployment process.
B. Update the application to retrieve the variables from AWS Systems Manager Parameter Store. Use unique paths in Parameter Store for each variable in each environment. Store the credentials in AWS Secrets Manager in each environment.
C. Update the application to retrieve the variables from an encrypted file that is stored with the application.
Store the API URL and credentials in unique files for each environment.
D. Update the application to retrieve the variables from AWS Key Management Service (AWS KMS).
Store the API URL and credentials as unique keys for each environment.

Answer: B

Explanation:
AWS Systems Manager Parameter Store is a service that provides secure, hierarchical storage for configuration data management and secrets management. The developer can update the application to retrieve the variables from Parameter Store by using the AWS SDK or the AWS CLI. The developer can use unique paths in Parameter Store for each variable in each environment, such as /dev/api-url, /test/api-url, and /prod
/api-url. The developer can also store the credentials in AWS Secrets Manager, which is integrated with Parameter Store and provides additional features such as automatic rotation and encryption.
References:
* [What Is AWS Systems Manager? - AWS Systems Manager]
* [Parameter Store - AWS Systems Manager]
* [What Is AWS Secrets Manager? - AWS Secrets Manager]

NEW QUESTION # 200
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