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Intermediate6 lessons138 minutes

DNS: pointing a domain at your server

Understand how a name resolves, publish the right records, and diagnose with dig instead of waiting.

"DNS propagation" does not exist: a record is published instantly, it is caches that expire. This course replaces waiting with verification, and covers the records a web server and a mail server actually need.

What you will be able to do

  • Follow a DNS query's path, from resolver to authoritative server
  • Publish A, AAAA, CNAME, MX and TXT records in the right place
  • Query an authoritative server rather than a cache, with dig
  • Prepare a migration by lowering the TTL in advance

Before this course

Taken from the learning path this course belongs to: the course placed just before it. A suggested order, not a lock — nothing here closes until you have finished it.

Outline

  1. 01

    How a name resolves

    A query's path, and the records that matter.

  2. 02

    When the answer is wrong, or about to change

    Read a failure, wait out a negative cache, and move a domain without dropping anything.

Technical content last reviewed on 3 August 2026