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Amazon DVA-C02 Exam Syllabus Topics:

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

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                                Amazon AWS Certified Developer - Associate Sample Questions (Q653-Q658):

                                NEW QUESTION # 653
                                A developer needs to export the contents of several Amazon DynamoDB tables into Amazon S3 buckets to comply with company data regulations. The developer uses the AWS CLI to run commands to export from each table to the proper S3 bucket. The developer sets up AWS credentials correctly and grants resources appropriate permissions. However, the exports of some tables fail.
                                What should the developer do to resolve this issue?

                                Answer: B

                                Explanation:
                                Comprehensive Detailed and Lengthy Step-by-Step Explanation with All AWS Developer Reference:
                                1. Understanding the Use Case:
                                The developer needs to export DynamoDB table data into Amazon S3 buckets using the AWS CLI, and some exports are failing. Proper credentials and permissions have already been configured.
                                2. Key Conditions to Check:
                                Region Consistency:
                                DynamoDB exports require that the target S3 bucket and the DynamoDB table reside in the same AWS Region. If they are not in the same Region, the export process will fail.
                                Point-in-Time Recovery (PITR):
                                PITR is not required for exporting data from DynamoDB to S3. Enabling PITR allows recovery of table states at specific points in time but does not directly influence export functionality.
                                DynamoDB Streams:
                                Streams allow real-time capture of data modifications but are unrelated to the bulk export feature.
                                DAX (DynamoDB Accelerator):
                                DAX is a caching service that speeds up read operations for DynamoDB but does not affect the export functionality.
                                3. Explanation of the Options:
                                Option A:
                                "Ensure that point-in-time recovery is enabled on the DynamoDB tables." While PITR is useful for disaster recovery and restoring table states, it is not required for exporting data to S3. This option does not address the export failure.
                                Option B:
                                "Ensure that the target S3 bucket is in the same AWS Region as the DynamoDB table." This is the correct answer. DynamoDB export functionality requires the target S3 bucket to reside in the same AWS Region as the DynamoDB table. If the S3 bucket is in a different Region, the export will fail.
                                Option C:
                                "Ensure that DynamoDB streaming is enabled for the tables."
                                Streams are useful for capturing real-time changes in DynamoDB tables but are unrelated to the export functionality. This option does not resolve the issue.
                                Option D:
                                "Ensure that DynamoDB Accelerator (DAX) is enabled."
                                DAX accelerates read operations but does not influence the export functionality. This option is irrelevant to the issue.
                                4. Resolution Steps:
                                To ensure successful exports:
                                Verify the Region of the DynamoDB tables:
                                Check the Region where each table is located.
                                Verify the Region of the target S3 buckets:
                                Confirm that the target S3 bucket for each export is in the same Region as the corresponding DynamoDB table.
                                If necessary, create new S3 buckets in the appropriate Regions.
                                Run the export command again with the correct setup:
                                aws dynamodb export-table-to-point-in-time \
                                --table-name <TableName> \
                                --s3-bucket <BucketName> \
                                --s3-prefix <Prefix> \
                                --export-time <ExportTime> \
                                --region <Region>
                                Reference:
                                Exporting DynamoDB Data to Amazon S3
                                S3 Bucket Region Requirements for DynamoDB Exports
                                AWS CLI Reference for DynamoDB Export


                                NEW QUESTION # 654
                                A developer is building an application that uses an AWS Lambda function to process data. The application requires minimum latency. The Lambda function must have predictable function start times. All setup activities for the execution environment must happen before invocation of the Lambda function.
                                Which solution will meet these requirements?

                                Answer: D


                                NEW QUESTION # 655
                                A company notices that credentials that the company uses to connect to an external software as a service (SaaS) vendor are stored in a configuration file as plaintext.
                                The developer needs to secure the API credentials and enforce automatic credentials rotation on a quarterly basis.
                                Which solution will meet these requirements MOST securely?

                                Answer: D


                                NEW QUESTION # 656
                                A developer deployed an application to an Amazon EC2 instance The application needs to know the public IPv4 address of the instance How can the application find this information?

                                Answer: C

                                Explanation:
                                * Instance Metadata Service: EC2 instances have access to an internal metadata service. It provides instance-specific information like instance ID, security groups, and public IP address.
                                * Accessing Metadata:
                                * Make an HTTP GET request to the base URL: http://169.254.169.254/latest/meta-data/
                                * You'll get a list of available categories. The public IPv4 address is under public-ipv4.
                                References:
                                * Instance Metadata and User Data: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide
                                /instancedata-data-retrieval.html


                                NEW QUESTION # 657
                                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?

                                Answer: C

                                Explanation:
                                Explanation
                                Amazon Cognito user pools is a service that provides a secure user directory that scales to hundreds of millions of users. The developer can use Amazon Cognito user pools to manage user accounts and create an Amazon Cognito user pool authorizer in API Gateway to control access to the API. The developer can use the Lambda function to store the photos in Amazon S3, which is a highly scalable, durable, and secure object storage service. The developer can store the object's S3 key as part of the photo details in the DynamoDB table, which is a fast and flexible NoSQL database service. The developer can retrieve previously uploaded photos by querying DynamoDB for the S3 key and fetching the photos from S3. This solution will meet the requirements with the least operational overhead.
                                References:
                                [Amazon Cognito User Pools]
                                [Use Amazon Cognito User Pools - Amazon API Gateway]
                                [Amazon Simple Storage Service (S3)]
                                [Amazon DynamoDB]


                                NEW QUESTION # 658
                                ......

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