WAF vs CDN: what’s the difference?

Both are edge technologies, but they solve different problems—and together they’re strongest.

CDN (Content Delivery Network)

  • Caches and serves static assets close to users; improves speed and resilience.
  • Reduces load on origin, smoothing traffic spikes.

WAF (Web Application Firewall)

  • Inspects requests to block abusive or malicious patterns at L7.
  • Adds rules, challenges, bot management, and rate limits.

When do you need both?

  • Sites with dynamic pages/APIs benefit from WAF filtering and CDN caching for static bits.
  • WAF blocks bad requests; CDN reduces origin work—together they keep you online under stress.