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Design an authoritative DNS infrastructure supporting zone transfers, DNSSEC signing, anycast deployment across 50+ PoPs, automated failover, dynamic DNS updates, and split-horizon resolution for internal vs external clients.
## Problem
Your company operates a global SaaS platform with thousands of customer domains. You have been asked to design the authoritative DNS infrastructure that serves DNS queries for all customer zones, replacing the current managed DNS provider to reduce costs and gain control over features like dynamic DNS updates and split-horizon resolution.
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