Question 1

What is an A record?

Accepted Answer

The A record is the most basic DNS record type — it points a domain to an IPv4 address, e.g. example.com to 192.0.2.1.

Question 2

What is a CNAME record?

Accepted Answer

A CNAME record points one domain to another, e.g. www.example.com to example.com. Note: CNAME cannot be used on the root domain.

Question 3

What is an MX record?

Accepted Answer

An MX record specifies the mail servers that handle email for a domain. Priorities can be set — lower numbers win.

Question 4

What is TTL?

Accepted Answer

TTL (time to live) is how many seconds a DNS record stays cached. Shorter TTLs make changes take effect faster but increase query volume; global DNS propagation typically takes 24-48 hours depending on TTL.