AWS Certified Solutions Architect – Professional (SAP-C02) — Question 358

A company has a web application that securely uploads pictures and videos to an Amazon S3 bucket. The company requires that only authenticated users are allowed to post content. The application generates a presigned URL that is used to upload objects through a browser interface. Most users are reporting slow upload times for objects larger than 100 MB.

What can a solutions architect do to improve the performance of these uploads while ensuring only authenticated users are allowed to post content?

Answer options

• A. Set up an Amazon API Gateway with an edge-optimized API endpoint that has a resource as an S3 service proxy. Configure the PUT method for this resource to expose the S3 PutObject operation. Secure the API Gateway using a COGNITO_USER_POOLS authorizer. Have the browser interface use API Gateway instead of the presigned URL to upload objects.
• B. Set up an Amazon API Gateway with a regional API endpoint that has a resource as an S3 service proxy. Configure the PUT method for this resource to expose the S3 PutObject operation. Secure the API Gateway using an AWS Lambda authorizer. Have the browser interface use API Gateway instead of the presigned URL to upload objects.
• C. Enable an S3 Transfer Acceleration endpoint on the S3 bucket. Use the endpoint when generating the presigned URL. Have the browser interface upload the objects to this URL using the S3 multipart upload API.
• D. Configure an Amazon CloudFront distribution for the destination S3 bucket. Enable PUT and POST methods for the CloudFront cache behavior. Update the CloudFront origin to use an origin access identity (OAI). Give the OAI user 3: PutObject permissions in the bucket policy. Have the browser interface upload objects using the CloudFront distribution.

Correct answer: C

Explanation

S3 Transfer Acceleration speeds up uploads by routing data through AWS Edge Locations over the optimized AWS global network, while the S3 multipart upload API allows large files (over 100 MB) to be split and uploaded in parallel. Amazon API Gateway has a strict payload size limit of 10 MB, making options A and B incorrect for files larger than 100 MB. Option D is incorrect because uploading directly to CloudFront using an OAI does not enforce the application's authenticated presigned URL mechanism.