Intermediate2 lessons52 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
Outline
- 01
How a name resolves
A query's path, and the records that matter.
Technical content last reviewed on 3 August 2026