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DVA-C02試験では、計算、ストレージ、データベース、ネットワーキング、セキュリティ、アプリケーション統合など、幅広いAWSサービスをカバーしています。候補者は、回復力があり、スケーラブルで、費用対効果の高いアプリケーションを設計および展開するためのAWSサービスとベストプラクティスについて確実に理解することが期待されています。この試験は、65の複数選択と複数の反応の質問で構成されており、候補者はそれを完了するのに130分かかります。

>> DVA-C02日本語練習問題 <<

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認定試験は、AWSのアプリケーションの開発と維持に少なくとも1年の経験がある個人を対象としています。候補者は、AWSサービス、プログラミング言語、および開発フレームワークをよく理解する必要があります。また、AWSの展開および管理ツール、およびAWSでアプリケーションを開発およびテストするためのベストプラクティスにも精通している必要があります。

Amazon AWS Certified Developer - Associate 認定 DVA-C02 試験問題 (Q727-Q732):

質問 # 727
A developer at a company recently created a serverless application to process and show data from business reports. The application's user interface (UI) allows users to select and start processing the files. The UI displays a message when the result is available to view. The application uses AWS Step Functions with AWS Lambda functions to process the files. The developer used Amazon API Gateway and Lambda functions to create an API to support the UI.
The company's UI team reports that the request to process a file is often returning timeout errors because of the size or complexity of the files. The UI team wants the API to provide an immediate response so that the UI can display a message while the files are being processed. The backend process that is invoked by the API needs to send an email message when the report processing is complete.
What should the developer do to configure the API to meet these requirements?

A. Change the configuration of the Lambda function that implements the request to process a file.
Configure the maximum age of the event so that the Lambda function will run asynchronously.
B. Change the API Gateway route to add an X-Amz-Target header with a static value of 'Async' in the integration request. Deploy the API Gateway stage to apply the changes.
C. Change the API Gateway route to add an X-Amz-Invocation-Type header with a static value of
'Event' in the integration request. Deploy the API Gateway stage to apply the changes.
D. Change the API Gateway timeout value to match the Lambda function timeout value. Deploy the API Gateway stage to apply the changes.

正解：C

解説：
https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-integration- async.html

質問 # 728
A developer is creating a template that uses AWS CloudFormation to deploy an application. The application is serverless and uses Amazon API Gateway, Amazon DynamoDB, and AWS Lambda.
Which AWS service or tool should the developer use to define serverless resources in YAML?

A. AWS Serverless Application Model (AWS SAM)
B. CloudFormation serverless intrinsic functions
C. AWS Cloud Development Kit (AWS CDK)
D. AWS Elastic Beanstalk

正解：A

解説：
AWS Serverless Application Model (AWS SAM) is an open-source framework that enables developers to build and deploy serverless applications on AWS. AWS SAM uses a template specification that extends AWS CloudFormation to simplify the definition of serverless resources such as API Gateway, DynamoDB, and Lambda. The developer can use AWS SAM to define serverless resources in YAML and deploy them using the AWS SAM CLI.
Reference:
[What Is the AWS Serverless Application Model (AWS SAM)? - AWS Serverless Application Model]
[AWS SAM Template Specification - AWS Serverless Application Model]

質問 # 729
A developer has created an AWS Lambda function for a company's application. The developer must make the Lambda function available for other developers at the company to deploy as needed. The other developers must be able to use the application without needing to configure the environment or resources.
The developer decides to publish the application in the AWS Serverless Application Repository and needs to build the AWS SAM template for the deployment.
Which sections is the developer required to include in the template? (Choose two.)

A. Metadata
B. Parameters
C. Transform
D. Globals
E. Resources

正解：C、E

解説：
A valid AWS SAM template for the Serverless Application Repository must include the Resources section to define the AWS resources (such as the Lambda function) and the Transform section to specify the use of the AWS SAM transform. These are mandatory to describe the infrastructure and enable SAM processing.

質問 # 730
An organization is using Amazon CloudFront to ensure that its users experience low-latency access to its web application. The organization has identified a need to encrypt all traffic between users and CloudFront, and all traffic between CloudFront and the web application.
How can these requirements be met? (Select TWO)

A. Set the Origin's HTTP Port to 443.
B. Enable the CloudFront option Restrict Viewer Access.
C. Use AWS KMS t0 encrypt traffic between cloudFront and the web application.
D. Set the Origin Protocol Policy to "HTTPS Only".
E. Set the Viewer Protocol Policy to "HTTPS Only" or Redirect HTTP to HTTPS"

正解：D、E

解説：
This solution will meet the requirements by ensuring that all traffic between users and CloudFront, and all traffic between CloudFront and the web application, are encrypted using HTTPS protocol. The Origin Protocol Policy determines how CloudFront communicates with the origin server (the web application), and setting it to "HTTPS Only" will force CloudFront to use HTTPS for every request to the origin server. The Viewer Protocol Policy determines how CloudFront responds to HTTP or HTTPS requests from users, and setting it to "HTTPS Only" or "Redirect HTTP to HTTPS" will force CloudFront to use HTTPS for every response to users. Option A is not optimal because it will use AWS KMS to encrypt traffic between CloudFront and the web application, which is not necessary or supported by CloudFront. Option C is not optimal because it will set the origin's HTTP port to 443, which is incorrect as port 443 is used for HTTPS protocol, not HTTP protocol. Option E is not optimal because it will enable the CloudFront option Restrict Viewer Access, which is used for controlling access to private content using signed URLs or signed cookies, not for encrypting traffic.

質問 # 731
A developer is building an application that will use an Amazon API Gateway API with an AWS Lambda backend. The team that will develop the frontend requires immediate access to the API endpoints to build the UI. To prepare the backend application for integration, the developer needs to set up endpoints. The endpoints need to return predefined HTTP status codes and JSON responses for the frontend team. The developer creates a method for an API resource.
Which solution will meet these requirements?

A. Set the integration type to MOCK. Configure the method's integration request and integration response to associate JSON responses with specific HTTP status codes.
B. Set the integration type to HTTP PROXY. Configure API Gateway to pass all requests to an external placeholder API, which the team will build.
C. Set the integration type to AWS_PROXY. Provision Lambda functions to return hardcoded JSON data.
D. Set the integration type to MOCK. Use a method request to define HTTP status codes. Use an integration request to define JSON responses.

正解：A

解説：
To give the frontend team immediate access to stable endpoints without waiting for a real backend implementation, the simplest approach is to use API Gateway MOCK integration. A MOCK integration lets API Gateway generate a response directly, without invoking Lambda or any other backend. This is ideal for early UI development because you can return consistent, predefined payloads and status codes for each method.
With MOCK integration, you configure an integration request (often using a static mapping template) to produce a dummy request payload that triggers a response, and then you configure integration responses to return specific HTTP status codes (such as 200, 400, 500) along with predefined JSON bodies. You can also set response headers (for example, Content-Type: application/json) and use mapping templates to shape the returned JSON. This satisfies the requirement to "return predefined HTTP status codes and JSON responses" while minimizing development effort and avoiding the need to deploy placeholder Lambda functions.
Option A (AWS_PROXY with Lambda) can work, but it requires creating and deploying Lambda functions and IAM permissions just to return static data-more effort than necessary. Option C (HTTP PROXY) depends on an external placeholder service, which adds another system to build and maintain. Option D is incorrect because HTTP status codes are not defined in the method request; they are defined through method responses and realized through integration responses in API Gateway's integration configuration.
Therefore, B is the best solution: MOCK integration with integration request/response mappings provides quick, code-free stubs that unblock frontend development.

質問 # 732
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