DNS

Question 1

Name the 9 common DNS record types

Answer 1

A
AAAA
CNAME
NS
PTR
MX
SRV
TXT
SOA

Question 2

What is the purpose of a DNS A Record?

Answer 2

It maps an FQDN to an IPv4 IP address

Question 3

What is the purpose of a DNS AAAA Record?

Answer 3

It maps an FQDN to an IPv6 IP address

Question 4

What is the purpose of a DNS CNAME Record?

Answer 4

Canonical name - an alias that is used to “hide” the actual host name

Question 5

What is the purpose of a DNS NS Record?

Answer 5

The name of an authoritative name server. This is a name server (DNS server) for a specific zone which may, in turn, reference an A record.

Question 6

What is the purpose of a DNS PTR Record?

Answer 6

Maps and IP address to an FQDN; This is the reverse of an A record or AAAA record

Question 7

What is the purpose of a DNS MX Record?

Answer 7

Mail Exchange - this specifies a mail server, such as mail.domain.com

Question 8

What is the purpose of a DNS SRV Record?

Answer 8

Service record which contains a service, protocol (TCP/UDP/SSL) Priority, Weight, TTL, and Name

Question 9

What is the purpose of a DNS TXT Record?

Answer 9

This just contains a string of text. Sometimes used by providers or cloud services for temporary domain discovery.

Question 10

What is the purpose of a DNS SOA Record?

Answer 10

Start of Authority - Includes zone details like authoritative server, TTL, owner, and others.