DNS and the Threat of DDoS WHITEPAPERContent 03 Executive Summary 04 Large, growing attacks pose a new degree of threat to DNS 04 Massive IoT-based and server-based botnets 05 Overwhelming DNS servers: UDP floods 05 Exploiting how DNS works: DNS amplification 06 The impacts of large DDoS attacks on DNS resolvers and downstream victims 06 How to stop the coming threats targeting DNS infrastructure 06 Legacy DDoS mitigation via hardware vs. scalable mitigation via software 07 The future does not come in a box 08 How Cloudflare easily scales up DNS security 09 Winning the arms race and remaining resilient in the face of DDoS attacks 09 Protecting DNS from all kinds of attacks and exploitation 10 Takeaways 11 References 1 888 99 FLARE | enterprise@cloudflare.com | www.cloudflare.com3 3 Exe

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