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Amazon DVA-C02 Exam Syllabus Topics:

SectionWeightObjectives
Security26%- Data security
  • 1. Encryption using AWS KMS
    • 2. Secure API access patterns
      - Application authentication and authorization
      • 1. Cognito user authentication
        • 2. IAM roles and policies
          Deployment24%- CI/CD and deployment strategies
          • 1. AWS CodePipeline workflows
            • 2. AWS CodeBuild and CodeDeploy usage
              - Infrastructure as code
              • 1. AWS CloudFormation templates
                Troubleshooting and Optimization18%- Monitoring and logging
                • 1. Amazon CloudWatch metrics and logs
                  - Performance optimization
                  • 1. Fault tolerance and resilience patterns
                    • 2. Application performance tuning
                      Development with AWS Services32%- Application development and integration
                      • 1. API Gateway and REST APIs
                        • 2. Event-driven architectures with SNS/SQS
                          - AWS core services development
                          • 1. Amazon DynamoDB integration patterns
                            • 2. Amazon S3 usage in applications
                              • 3. AWS Lambda functions development

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                                Amazon AWS Certified Developer - Associate 認定 DVA-C02 試験問題 (Q643-Q648):

                                質問 # 643
                                A developer is creating an application that will give users the ability to store photos from their cellphones in the cloud. The application needs to support tens of thousands of users. The application uses an Amazon API Gateway REST API that is integrated with AWS Lambda functions to process the photos. The application stores details about the photos in Amazon DynamoDB.
                                Users need to create an account to access the application. In the application, users must be able to upload photos and retrieve previously uploaded photos. The photos will range in size from 300 KB to 5 MB.
                                Which solution will meet these requirements with the LEAST operational overhead?

                                正解：D


                                質問 # 644
                                An Amazon Simple Queue Service (Amazon SQS) queue serves as an event source for an AWS Lambda function In the SQS queue, each item corresponds to a video file that the Lambda function must convert to a smaller resolution The Lambda function is timing out on longer video files, but the Lambda function's timeout is already configured to its maximum value What should a developer do to avoid the timeouts without additional code changes'?

                                正解：C

                                解説：
                                Explanation
                                Increasing the memory configuration of the Lambda function will also increase the CPU and network throughput available to the function. This can improve the performance of the video conversion process and reduce the execution time of the function. This solution does not require any code changes or additional resources. It is also recommended to follow the best practices for preventing Lambda function timeouts1. References
                                * Troubleshoot Lambda function invocation timeout errors | AWS re:Post


                                質問 # 645
                                A developer is reviewing an AWS Step Functions state machine to process files that are uploaded to an Amazon S3 bucket. The state machine is created by an AWS CloudFormation template. The state machine includes three sequential AWS Lambda functions. The state machine runs when new objects are uploaded to the S3 bucket. Full logging to Amazon CloudWatch and AWS X-Ray is enabled in the template.
                                When the developer reviews the state machine output, the developer sees that the logs include sensitive information. The developer must prevent the logs from storing sensitive information.
                                Which solution will meet this requirement?

                                正解：C

                                解説：
                                Setting IncludeExecutionData to false prevents Step Functions from including execution input and output data in CloudWatch Logs. This keeps sensitive payload data out of the logs while still allowing the state machine to log execution events.


                                質問 # 646
                                A developer is creating an application that uses an Amazon DynamoDB table. The developer needs to develop code that reads all records that were added to the table during the previous day, creates HTML reports, and pushes the reports into third-party storage. The item size varies from 1 KB to 4 KB, and the index structure is defined with the date. The developer needs to minimize the read capacity that the application requires from the DynamoDB table.
                                Which DynamoDB API operation should the developer use in the code to meet these requirements?

                                正解：B


                                質問 # 647
                                A developer is setting up infrastructure by using AWS CloudFormation. If an error occurs when the resources described in the Cloud Formation template are provisioned, successfully provisioned resources must be preserved. The developer must provision and update the CloudFormation stack by using the AWS CLI.
                                Which solution will meet these requirements?

                                正解：B

                                解説：
                                The --disable-rollback command-line option will prevent CloudFormation from rolling back the stack to the previous state if an error occurs. This will ensure that successfully provisioned resources are preserved.


                                質問 # 648
                                ......

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