<aside> 🧭
DNS · Domain Name System
A complete, self-contained learning track. No prior networking or DNS theory assumed — only that you have used Linux and typed a hostname into a browser.
Nine modules take you from "what is a name" to running a signed authoritative zone and debugging a five-second timeout inside Kubernetes. Every concept is taught before it is used, so the modules are meant to be read in order.
🧠 concept → 🧪 exercise → ✅ expected result (hidden) → 🎯 interview questions (answers hidden)
</aside>
🟢 Foundation
01 · Names, Resolvers & Your First Query
02 · Resource Records, Zone Files & Reading a Domain
03 · Delegation, Recursion & Caching
🟡 Intermediate
04 · The Wire Protocol — UDP, TCP & EDNS(0)
05 · Running an Authoritative Server
06 · The Resolver Side of a Linux Host
🔴 Advanced
07 · DNSSEC
08 · DNS in the Cloud & in Kubernetes
09 · Performance, Reliability & Security at Scale
Module 01 — Names, Resolvers & Your First Query
Module 02 — Resource Records, Zone Files & Reading a Domain
Module 03 — Delegation, Recursion & Caching
Module 04 — The Wire Protocol: UDP, TCP & EDNS(0)
Module 05 — Running an Authoritative Server (BIND 9)
Module 06 — The Resolver Side of a Linux Host
Module 08 — DNS in the Cloud & in Kubernetes
Module 09 — Performance, Reliability & Security at Scale
⚡ Daily Ops Cheat Sheet — DNS & Linux Networking
<aside> 💡
How to use this — read the concept, attempt the 🧪 exercise before opening the ✅ expected-result toggle, then close each topic by answering the 🎯 interview questions out loud without opening the answers.
</aside>