Domains & DNS

Domains & DNS Explained

3 min read Web Hosting Essentials

Understand domain registration, DNS records, and how names reach your site.

Learning objectives

Explain domain registration and ownership
Describe the key DNS record types
Troubleshoot common DNS problems

Domain registration

Buying a domain registers your ownership of a name, renewed periodically. Losing control of a domain - through expiry or a hijacked account - is one of the most disruptive events a business can face.

Key DNS records

A / AAAA: map a name to an IPv4 / IPv6 address.
CNAME: aliases one name to another.
MX: routes email to mail servers.
TXT: verification records and email security.

Common DNS issues

Propagation delay after a change (up to 48 hours).
Wrong nameserver entries pointing to the old host.
Missing www record while the apex record exists.

Key takeaways

A domain is an asset; protect the account that controls it.
DNS records decide where traffic and email go.
Most DNS problems are configuration, not internet issues.