Amazon S3 Transfer Acceleration is a bucket-level feature specifically designed to enable fast, easy, and secure transfers of files over long distances between a client and an S3 bucket. It leverages the globally distributed edge locations in Amazon CloudFront. As data arrives at an edge location, it is routed to Amazon S3 over an optimized network path. This is particularly effective for uploading large files (gigabytes) from geographically diverse locations, as it minimizes the variability in internet routing and congestion, thereby increasing throughput and speed. To use this feature, it must be enabled on the S3 bucket, and the application must use the unique s3-accelerate endpoint.

A. Amazon CloudFront is a Content Delivery Network (CDN) optimized for accelerating the delivery (download) of content to users, not for accelerating uploads to S3.

B. Amazon ElastiCache is an in-memory caching service used to improve the performance of web applications by retrieving data from memory; it is not used for file uploads.

C. AWS Global Accelerator improves application availability and performance by directing traffic to optimal endpoints, but it does not directly integrate with S3 buckets for file uploads.

1. Amazon S3 User Guide

"Configuring fast

secure file transfers using Amazon S3 Transfer Acceleration": "Amazon S3 Transfer Acceleration can speed up content transfers to and from Amazon S3 by as much as 50-500% for long-distance transfer of larger objects... It takes advantage of Amazon CloudFront’s globally distributed edge locations. As the data arrives at an edge location

data is routed to Amazon S3 over an optimized network path."

2. Amazon S3 User Guide

"Using Amazon S3 Transfer Acceleration": "After you enable Transfer Acceleration on a bucket

you can use the accelerate endpoint... For example

my-bucket.s3-accelerate.amazonaws.com."

3. Amazon CloudFront Developer Guide

"How CloudFront delivers content": "Amazon CloudFront is a web service that speeds up distribution of your static and dynamic web content... to your users. CloudFront delivers your content through a worldwide network of data centers called edge locations." (This highlights its primary role in content delivery

not upload acceleration).

4. AWS Global Accelerator Developer Guide

"How AWS Global Accelerator works": "You can associate the static IP addresses with regional AWS resources or endpoints

such as Application Load Balancers

Network Load Balancers

and Amazon EC2 instances." (Note: S3 buckets are not listed as a standard endpoint type).