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.