How does hosting and CDN level DDoS protection work?

Protecting web resources from distributed denial-of-service attacks has become a critical task for any modern project, whether it is a small blog or a large online store. An attack can completely paralyze a server's operation by exhausting its computing resources or communication channel.

At the traditional hosting level, basic protection usually includes data center-level traffic filtering. Providers monitor anomalous activity and can automatically block IP addresses from which a suspicious stream of requests is coming. However, such protection is not always effective against complex application-layer attacks targeting the site's logic itself.

A more effective solution is using content delivery networks or CDNs with built-in security modules, such as Cloudflare, Quic.cloud, or similar services.

The operational principle of CDN protection is that all incoming traffic first goes to the intermediary company's distributed network of servers rather than directly to your hosting.

Using a CDN not only protects the site from downtime, but also significantly speeds up its loading for clients from other regions due to the geographically close location of server nodes.