SAA-C03 Q48 · Cost

Question

A company's packaged application dynamically creates and returns single-use text files in response to user requests. The company is using Amazon CloudFront for distribution, but wants to further reduce data transfer costs. The company cannot modify the application's source code. What should a solutions architect do to reduce costs?

Accepted Answer

**Option A: Use Lambda@Edge to compress the files as they are sent to users.**

Let's break down each requirement:

1. **Reduce data transfer costs**: Compressing text files can achieve 60-90% size reduction. Since CloudFront charges are based on data transferred out, smaller files = lower costs. This directly addresses the goal.

2. **Single-use, dynamically generated files**: These files are unique per request, meaning caching is ineffective — each file is different and used only once. Compression, however, works regardless of uniqueness.

3. **Cannot modify application source code**: Lambda@Edge runs at CloudFront edge locations and intercepts the **origin response** (after the application generates the file but before it reaches the user). It compresses the response body without touchi

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