Question 1

What is a DNS lookup?

Accepted Answer

A DNS (Domain Name System) lookup queries the nameservers for a domain to retrieve its DNS records. These records control how the domain resolves to IP addresses, handles email, and more.

Question 2

What is an A record?

Accepted Answer

An A record maps a domain name to an IPv4 address. When you type a URL in a browser, it looks up the A record to find which server to connect to.

Question 3

What is an MX record?

Accepted Answer

MX (Mail Exchange) records specify which mail servers handle email for a domain. The priority number determines preference: lower numbers are tried first.

Question 4

What is a TXT record used for?

Accepted Answer

TXT records contain arbitrary text and are commonly used for domain ownership verification, SPF (email sender policy), DKIM keys, and DMARC policies.

Question 5

What is TTL in DNS?

Accepted Answer

TTL (Time To Live) is the number of seconds a DNS resolver should cache the record before requesting a fresh copy from the authoritative nameserver. Lower TTLs mean faster propagation of changes.