Overview

DNS is the internet's control plane. Before a browser sends a request, before a TLS handshake begins, before an application exchanges a single byte with a server, DNS resolves the destination. When DNS fails, applications do not degrade - they disappear. The servers are healthy, the network is operational, and users experience a complete outage. Despite this, DNS is consistently undertreated in engineering education, undermonitored in production infrastructure, and underfunded in security budgets. DNS: The Internet's Control Plane is the systematic treatment the field has needed. Written by a practitioner with a D.Sc. in Cybersecurity and over a decade of experience operating DNS at internet scale, this book covers the full operational stack - from protocol internals and resolver mechanics to DNSSEC key management, DNS DDoS defense, encrypted DNS deployment, and AI-driven threat detection. Every chapter pairs its core concept with the characteristic failure mode that concept produces in production. Every chapter ends with a real-world incident drawn from actual infrastructure failures, followed by the specific diagnostic steps that would have shortened the outage. Topics covered include DNS resolution mechanics and TTL behavior; authoritative DNS architecture and zone transfer protocols; anycast routing and global DNS network design; multi-provider DNS and active-active failover; DNS threat landscape including cache poisoning, hijacking, and subdomain takeover; DNSSEC implementation, KSK and ZSK management, and key rollover; DNS Water Torture attack detection; DNS DDoS defense and response rate limiting; DNS observability and telemetry pipelines; DNS over TLS and DNS over HTTPS; NIST SP 800-81r3 compliance; and DNS for AI inference infrastructure. This is the reference engineers reach for when the stakes are real and the answers have to be right.

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