CDN (Content Delivery Network)

A CDN caches and delivers content closer to users, improving performance and resilience.

Updated: 2026-03-06

Definition

A CDN uses distributed edge servers to deliver cached content and reduce load on origin servers.

CDNs can also help mitigate DDoS and improve availability.

Key points

Edge caching improves speed
Reduces origin load
Often includes DDoS/WAF features

Common mistakes

Caching sensitive/dynamic content incorrectly.
Not invalidating cache after critical updates.

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