A company serves mostly static images and JavaScript files from an origin in one AWS Region. They want to reduce origin load and improve global performance. Which change most directly increases cache-hit ratio for static assets while avoiding stale content?

Set Cache-Control headers on the origin to always be no-cache so clients revalidate frequently.

No-cache forces frequent revalidation, which reduces CloudFront cache usefulness and increases origin requests.

Disable query string forwarding so all URLs without query strings share one cached object even when content differs.

This can cause incorrect content delivery if different query parameters generate different responses.

Forward all headers, including cookies, to maximize personalization in edge cached responses.

Forwarding cookies and all headers typically reduces cache hits and increases cache fragmentation.

What does this SAA-C03 question test?

Read the scenario before looking for a memorised answer.

What is the correct answer to this question?

The correct answer is: Use versioned file names (e.g., app.abc123.js) and configure a long TTL with appropriate revalidation behavior. — The best way to improve cache-hit ratio for static assets is to ensure that objects remain immutable at a given URL. Using versioned file names (such as app.abc123.js) lets you set longer TTLs because the URL changes whenever content changes. CloudFront can then serve most requests directly from the edge cache, reducing latency and origin load. Proper revalidation behavior prevents stale content when updates occur via new URLs rather than overwriting old ones. Why others are wrong: A harms performance because no-cache prevents effective edge caching. C is risky because different responses can map to the same URL when query strings are ignored, potentially serving the wrong content. D reduces caching efficiency because varying on cookies and many headers fragments the cache and causes more origin fetches, increasing latency instead of decreasing it.

What should I do if I get this SAA-C03 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.