DNS

Question 1

A / AAAA record type

Answer 1

links hostname to IPv4 (A) / IPV6 (AAAA) address

Question 2

CNAME

Answer 2

Canonical name: points hostname to another (sub)domain

Question 3

MX

Answer 3

determines the hostname for the mail server

Question 4

SOA

Answer 4

Start of Authority: details for DNS zone transfer (primary to secondary) based on the serial number

Question 5

PTR

Answer 5

Pointer (reverse DNS lookup): IP to domain name (check not spam, troubleshooting)

Question 6

TXT

Answer 6

add text to dns record (for security/authentication purposes)

• -> SPF (Sender policy framework)
• -> DKIM (Domain Key Identified Mail)

Question 7

NS

Answer 7

nameserver: indicates authoritative DNS nameserver

Question 8

SRV

Answer 8

service: specifies host & port number for specific service