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DVA-C02考題寶典，DVA-C02證照信息

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>> DVA-C02考題寶典 <<

Amazon DVA-C02證照信息 - DVA-C02證照指南

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「DVA-C02」考試包括 65 道多選多答題，需在 130 分鐘內完成。考試費用為 $150，考生需達到至少 720 分 (滿分 1000 分) 才能通過。該考試提供英語、日語、韓語及簡體中文四種語言，可在測試中心或遠程線上監考進行。該認證有效期為三年，期滿後需重新認證以保持 AWS 認證開發人員 - 副專業人員的身份。

最新的 AWS Certified Associate DVA-C02 免費考試真題 (Q383-Q388):

問題 #383
A developer is building a serverless application on AWS for a workflow that processes high volumes of data. In the workflow, an AWS Step Functions state machine invokes several AWS Lambda functions.
One of the Lambda functions occasionally fails because of timeout errors during periods of high demand. The developer must ensure that the workflow automatically retries the failed function invocation if a timeout error occurs.
Which solution will meet this requirement?

A. Add a Timeout field in the Step Functions state machine definition. Configure the state machine with the maximum number of retry attempts.
B. Add a Retry field in the Step Functions state machine definition. Configure the state machine with the maximum number of retry attempts and the timeout error type to retry on.
C. Update the Step Functions state machine to pass the invocation request to an Amazon Simple Notification Service (Amazon SNS) topic. Subscribe a Lambda function to the SNS topic.Configure the Lambda function with the maximum number of retry attempts for a timeout error type.
D. Add a Fail state to the Step Functions state machine definition. Configure the state machine with the maximum number of retry attempts.

答案：B

問題 #384
A company has an application that uses an AWS Lambda function to process customer orders.
The company notices that the application processes some orders more than once. A developer needs to update the application to prevent duplicate processing. Which solution will meet this requirement with the LEAST implementation effort?

A. Configure the Lambda function to retry failed invocations. Implement a retry mechanism that has a fixed delay between attempts to handle duplicate events.
B. Implement a de-duplication mechanism that uses Amazon DynamoDB as the control database.
Configure the Lambda function to check for the existence of a unique identifier before processing each event.
C. Use Amazon Athena to query processed events to identify duplicate records. Add processing logic to the Lambda function to handle the duplication scenarios that the query identifies.
D. Create a custom Amazon ECS task to perform idempotency checks. Use AWS Step Functions to integrate the ECS task with the Lambda function.

答案：B

問題 #385
A developer wrote an application that uses an AWS Lambda function to asynchronously generate short videos based on requests from customers. This video generation can take up to 10 minutes.
After the video is generated, a URL to download the video is pushed to the customer's web browser. The customer should be able to access these videos for at least 3 hours after generation.
Which solution will meet these requirements?

A. Store the video in an Amazon CloudFront distribution. Generate a pre-signed URL for the video object and push the URL to the customer.
B. Store the video in Amazon S3. Generate a pre-signed URL for the video object and push the URL to the customer.
C. Store the video in an Amazon Elastic File System (Amazon EFS) file system attached to the function. Generate a pre-signed URL for the video object and push the URL to the customer.
D. Store the video in the /tmp folder within the Lambda execution environment. Push a Lambda function URL to the customer.

答案：B

問題 #386
A company must encrypt sensitive data that the company will store in Amazon S3. A developer must retain total control over the company's AWS Key Management Service (AWS KMS) key and the company's data keys. The company currently uses an on-premises hardware security module (HSM) solution. The company wants to move its key management onto AWS.
Which solution will meet these requirements?

A. Implement server-side encryption with AWS KMS managed keys (SSE-KMS). Use AWS CloudHSM to generate the KMS key and data keys to use with AWS KMS.
B. Implement server-side encryption with AWS KMS managed keys (SSE-KMS). Use the AWS KMS custom key store feature to manage the data keys. Then read or write objects to Amazon S3 as normal.
C. Implement server-side encryption with customer-provided encryption keys (SSE-C). Use AWS CloudHSM to generate the KMS key and manage the data keys that the company will use to read and write objects to Amazon S3.
D. Implement server-side encryption with Amazon S3 managed encryption keys (SSE-S3). Use AWS CloudHSM to generate the KMS key and manage the data keys that the company will use to read and write objects to Amazon S3.

答案：B

解題說明：
https://docs.aws.amazon.com/cloudhsm/latest/userguide/best-practices.html Q: Can other AWS services use CloudHSM to store and manage keys?
AWS services integrate with AWS Key Management Service, which in turn is integrated with AWS CloudHSM through the KMS custom key store feature. If you want to use the server-side encryption offered by many AWS services (such as EBS, S3, or Amazon RDS), you can do so by configuring a custom key store in AWS KMS.

問題 #387
A developer is building an application that uses an Amazon RDS for PostgreSQL database. To meet security requirements, the developer needs to ensure that data is encrypted at rest. The developer must be able to rotate the encryption keys on demand.

A. Create a 256-bit AES-GCM encryption key. Store the key in AWS Secrets Manager. Configure an AWS Lambda function to perform key rotation. Use the key to encrypt the database.
B. Create a symmetric customer managed AWS KMS key. Use the key to encrypt the database.
C. Use an AWS KMS managed encryption key to encrypt the database.
D. Create a 256-bit AES-GCM encryption key. Store the key in AWS Secrets Manager, and enable managed rotation. Use the key to encrypt the database.

答案：B

解題說明：
* Why Option B is Correct:A customer-managed AWS Key Management Service (KMS) key allows for encryption at rest and provides the ability to rotate the key on demand. This ensures compliance with security requirements for key management and database encryption.
* RDS integrates natively with AWS KMS, allowing the use of a customer-managed key for encrypting data at rest.
* Key rotation can be managed directly in AWS KMS without needing custom solutions.
* Why Other Options are Incorrect:
* Option A: AWS KMS managed encryption keys (AWS-owned keys) do not support key rotation on demand.
* Option C & D: Storing keys in AWS Secrets Manager with custom rotation is not a recommended approach for database encryption. AWS KMS is designed specifically for secure key management and encryption.
* AWS Documentation References:
* Encrypting Amazon RDS Resources
* AWS Key Management Service (KMS)

問題 #388
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