Networking and Content Delivery
CoreAmazon CloudFront
Content delivery network that caches and delivers content through edge locations using configured origins and policies.
Key points
- The cache key identifies which requests can reuse one cached object.
- Include only headers, cookies, and query strings that truly change the response.
- Origin request policy can forward values that do not need to split the cache.
Best-known use cases
- Reduce latency and origin load for reusable content.
- Cache distinct response variants by the minimum required viewer values.
What candidates often confuse it with
- CloudFront caches viewer responses at the edge; ElastiCache caches application/data results.
- Cache policy controls cache variation; origin request policy controls additional forwarded values.
Key takeaway
Keep the CloudFront cache key minimal but complete for the representation the origin returns.
Related services
- Amazon S3
- Elastic Load Balancing
- Amazon API Gateway
Relevant exam tasks
- D4.3 — Optimize applications by using AWS services and features
- 4.3.5 — Cache content based on request headers