DNS Explained — Practical, Step-by-Step Name Resolution & Best Practices

If you want DNS explained in clear, practical terms, this short primer gives you the essentials you need to debug, operate, and reason about DNS without getting lost in jargon. What you'll learn (quick) How name resolution actually works: client → resolver → root → TLD → authoritative → answer Common record types and when to use them (A/AAAA, CNAME, MX, NS, TXT) Caching and TTL: why changes can take time Recursive vs authoritative behavior Quick troubleshooting with dig/nslookup and production best practices DNS resolution, in one sentence A resolver takes a name from your client and follows delegations from root servers to TLDs to authoritative servers to retrieve the requested record — caching the result for the record’s TTL. Common DNS records (one-line cheat-sheet) A / AAAA — map names to IPv4 / IPv6 addresses CNAME — alias one name to another (don’t mix with other records on the same name) MX — mail routing for a domain NS — which servers are authoritative for a zone TXT — freefor