DVA-C02過去問 & DVA-C02受験体験

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Amazon DVA-C02 Exam Syllabus Topics:

SectionWeightObjectives
Deployment24%- Implement CI/CD pipelines
  • 1. Use AWS CodePipeline, CodeBuild, CodeDeploy
  • 2. Automate deployment and testing workflows
- Deploy applications on AWS
  • 1. Perform safe updates and rollbacks
  • 2. Deploy to AWS Lambda, Amazon EC2, Elastic Beanstalk
- Prepare application artifacts for deployment
  • 1. Package code and dependencies
  • 2. Use infrastructure as code (AWS CloudFormation, AWS SAM)
Troubleshooting and Optimization18%- Troubleshoot application issues
  • 1. Analyze logs, metrics, and traces
  • 2. Use Amazon CloudWatch, AWS X-Ray for monitoring
- Optimize application performance
  • 1. Optimize resource usage and costs
  • 2. Improve latency and throughput
- Debug and resolve errors
  • 1. Resolve integration and configuration problems
  • 2. Identify and fix code defects
Development with AWS Services32%- Interact with AWS data services
  • 1. Work with Amazon DynamoDB, Amazon S3
  • 2. Implement caching and data storage strategies
- Write code for applications hosted on AWS
  • 1. Use AWS SDKs and APIs
  • 2. Develop serverless applications
  • 3. Implement architectural patterns
- Integrate AWS services into applications
  • 1. Implement messaging and event-driven workflows
  • 2. Use AWS Lambda, API Gateway, Amazon EventBridge
Security26%- Secure application data
  • 1. Implement encryption at rest and in transit
  • 2. Manage secrets and credentials securely
- Apply security best practices
  • 1. Follow AWS Well-Architected Framework security principles
  • 2. Validate application security configurations
- Implement authentication and authorization
  • 1. Manage IAM roles, policies, and permissions
  • 2. Use Amazon Cognito for identity management

>> DVA-C02過去問 <<

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Amazon AWS Certified Developer - Associate 認定 DVA-C02 試験問題 (Q256-Q261):

質問 # 256
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?

正解：A

解説：
https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-caching.html


質問 # 257
A company has an application that generates large binary data outside of AWS. The company must encrypt the data before uploading the data to an Amazon S3 bucket.
Which solution will meet this requirement?

正解：C

解説：
Comprehensive and Detailed 250 to 300 words of Explanation From AWS Developer Documents:
The key requirement in this scenario is that the data must be encrypted before it is uploaded to Amazon S3, and the data is generated outside of AWS. This explicitly points to a client-side encryption requirement.
AWS documentation distinguishes clearly between server-side encryption and client-side encryption.
Server-side encryption options for Amazon S3-including enabling default bucket encryption or specifying the x-amz-server-side-encryption request header-encrypt the data after it is received by Amazon S3.
Therefore, options B and D do not satisfy the requirement because the plaintext data is transmitted to AWS before encryption occurs.
Option A, using the AWS KMS encrypt command, is not suitable for large binary objects. AWS KMS is designed to encrypt small pieces of data (up to 4 KB). AWS documentation explicitly states that for large payloads, customers should use envelope encryption instead of directly encrypting data with AWS KMS.
The AWS Encryption SDK is specifically designed for client-side encryption of large data objects. It implements envelope encryption, where a data encryption key (DEK) is generated locally to encrypt the data, and the DEK is then encrypted with an AWS KMS key. This approach allows efficient encryption of large binary files while maintaining strong key management and security controls.
AWS documentation recommends the AWS Encryption SDK for applications that need to encrypt data before sending it to AWS services, including Amazon S3. It supports multiple programming languages, handles key management automatically, and ensures data confidentiality even before transmission.
Therefore, using the AWS Encryption SDK for client-side encryption is the only solution that fully satisfies all requirements.


質問 # 258
A developer is using AWS CodeDeploy to launch an application onto Amazon EC2 instances. The application deployment fails during testing. The developer notices an IAM_ROLE_PERMISSIONS error code in Amazon CloudWatch logs.
What should the developer do to resolve the error?

正解：D


質問 # 259
A developer is building an application on a fleet of Amazon EC2 Linux instances that run Apache web server.
The application needs to send API calls that contain sensitive customer data to a second Linux fleet that also runs Apache within a peered VPC in the same AWS account and AWS Region as the original cluster. All sensitive data must be encrypted in transit. Instances in both fleets have Amazon EBS volumes attached.
Which solution will meet these requirements in the MOST operationally efficient way?

正解：B

解説：
The requirement is encryption in transit for sensitive data sent in API calls between two Apache-based EC2 fleets in peered VPCs. The most operationally efficient approach is to restrict network access and rely on standard TLS at the application layer. Among the provided options, the only operationally simple and directly relevant network control is security group referencing across VPC peering within the same account and Region.
By creating security groups that allow inbound traffic only from the other fleet's security group, the developer ensures that only the intended instances can communicate over the required ports (for example, 443 for HTTPS). This is operationally efficient because it avoids managing IP allowlists that change with Auto Scaling and keeps the trust boundary tied to instance membership rather than addresses. It also supports least privilege by limiting which sources can reach the service.
Why the other options are not the best fit:
* B (Site-to-Site VPN) is unnecessary for VPC peering in the same account/Region and adds significant operational overhead. It also does not replace the need for TLS at the application layer to guarantee encryption to the endpoint.
* C (EBS encryption) addresses encryption at rest on volumes, not encryption in transit between fleets.
* D (Nitro Enclaves) is heavy and unrelated to the core requirement; enclaves protect data-in-use and do not replace standard TLS for network encryption.
Important nuance: Security groups alone do not encrypt traffic; encryption is achieved by using HTTPS/TLS between the Apache services. However, option A is the most operationally efficient control offered here to implement secure connectivity between the fleets (paired with using HTTPS on Apache, which is the standard for encrypting API calls).
Therefore, A best meets the requirement with the least operational complexity.


質問 # 260
A developer is storing many objects in a single Amazon S3 bucket. The developer needs to optimize the S3 bucket for high request rates.
How should the developer store the objects to meet this requirement?

正解：B

解説：
https://docs.aws.amazon.com/AmazonS3/latest/userguide/optimizing-performance.html


質問 # 261
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