cloudflare's anti-ddos works primarily through their vast anycast network (330+ cities) that absorbs and disperses attack traffic at the edge, using massive compute to sustain it without overwhelming origins. autonomous systems analyze samples out-of-path for threats, then drop, rate-limit, or challenge malicious packets while letting legit traffic through—it's scale plus smart filtering, not just brute force.

cloudflare

https://developers.cloudflare.com/ddos-protection/about/how-ddos-protection-works/

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