DVA-C02考古题推薦：AWS Certified Developer - Associate考試即時下載|更新的DVA-C02

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AWS Certified Developer - Associate 考試是開發人員必須考取的重要認證，以展示他們在 AWS 平台上開發和部署應用程序的專業知識。該認證可以幫助候選人在雲計算領域提升職業發展，並開拓新的機遇。

最新的 AWS Certified Associate DVA-C02 免費考試真題 (Q121-Q126):

問題 #121
A developer has an application that makes batch requests directly to Amazon DynamoDB by using the BatchGetItem low-level API operation. The responses frequently return values in the UnprocessedKeys element.
Which actions should the developer take to increase the resiliency of the application when the batch response includes values in UnprocessedKeys? (Choose two.)

A. Retry the batch operation with exponential backoff and randomized delay.
B. Increase the provisioned write capacity of the DynamoDB tables that the operation accesses.
C. Update the application to use an AWS software development kit (AWS SDK) to make the requests.
D. Increase the provisioned read capacity of the DynamoDB tables that the operation accesses.
E. Retry the batch operation immediately.

答案：A,D

解題說明：
For B: "If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm. If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables" For D: "The most likely cause of a failed read or a failed write is throttling. For BatchGetItem, one or more of the tables in the batch request does not have enough provisioned read capacity to support the operation." Extracted from Error Handling Documentation:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.Errors.html
#BatchOperations

問題 #122
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?

A. Enable cross-origin resource sharing (CORS) for the APIs.
B. Enable API caching in API Gateway.
C. Configure API Gateway to use an interface VPC endpoint.
D. Configure usage plans and API keys in API Gateway.

答案：B

解題說明：
Explanation
Amazon API Gateway is a service that enables developers to create, publish, maintain, monitor, and secure APIs at any scale. The developer can enable API caching in API Gateway to cache responses from the backend integration point for a specified time-to-live (TTL) period. This can improve the responsiveness of the APIs by reducing the number of calls made to the backend service.
References:
[What Is Amazon API Gateway? - Amazon API Gateway]
[Enable API Caching to Enhance Responsiveness - Amazon API Gateway]

問題 #123
An ecommerce application is running behind an Application Load Balancer. A developer observes some unexpected load on the application during non-peak hours. The developer wants to analyze patterns for the client IP addresses that use the application. Which HTTP header should the developer use for this analysis?

A. The X-Forwarded-Port header
B. The X-F Forwarded-Host header
C. The X-Forwarded-Proto header
D. The X-Forwarded-For header

答案：D

解題說明：
The HTTP header that the developer should use for this analysis is the X-Forwarded-For header. This header contains the IP address of the client that made the request to the Application Load Balancer. The developer can use this header to analyze patterns for the client IP addresses that use the application. The other headers either contain information about the protocol, host, or port of the request, which are not relevant for the analysis.

問題 #124
A company with multiple branch locations has an analytics and reporting application. Each branch office pushes a sales report to a shared Amazon S3 bucket at a predefined time each day. The company has developed an AWS Lambda function that analyzes the reports from all branch offices in a single pass. The Lambda function stores the results in a database.
The company needs to start the analysis once each day at a specific time.
Which solution will meet these requirements MOST cost-effectively?

A. Configure the Lambda function to run continuously and to begin analysis only at the predefined time each day.
B. Configure an S3 event notification to invoke the Lambda function when a branch office uploads a sales report.
C. Create an AWS Step Functions state machine that invokes the Lambda function once each day at the predefined time.
D. Create an Amazon EventBridge scheduled rule that invokes the Lambda function once each day at the predefined time.

答案：D

問題 #125
A company wants to share information with a third party. The third party has an HTTP API endpoint that the company can use to share the information. The company has the required API key to access the HTTP API.
The company needs a way to manage the API key by using code. The integration of the API key with the application code cannot affect application performance. Which solution will meet these requirements MOST securely?

A. Store the API credentials in AWS Secrets Manager. Retrieve the API credentials at runtime by using the AWS SDK. Use the credentials to make the API call.
B. Store the API credentials as an object in a private Amazon S3 bucket. Restrict access to the S3 object by using IAM policies. Retrieve the API credentials at runtime by using the AWS SDK. Use the credentials to make the API call.
C. Store the API credentials in an Amazon DynamoDB table. Restrict access to the table by using resource-based policies. Retrieve the API credentials at runtime by using the AWS SDK. Use the credentials to make the API call.
D. Store the API credentials in a local code variable. Push the code to a secure Git repository. Use the local code variable at runtime to make the API call.

答案：A

解題說明：
It's not secure to store API keys in git repository. Hence storing it in secret manger is a most secure to way to handle this scenario.

問題 #126
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DVA-C02資訊: https://tw.fast2test.com/DVA-C02-premium-file.html