DNS Records

Question 1

What is an A Record?

Answer 1

Map domain name to IPv4 address

Question 2

What is an AAAA Record?

Answer 2

Map domain name to IPv6 address

Question 3

What is CNAME?

Answer 3

• Canonical Name
• Stores additional hostnames or alias for hosts in the domain.

Question 4

What is MX?

Answer 4

• Mail Exchange
• Points domain names of mail servers that handle incoming email traffic for the domain.

Question 5

What is TXT record?

Answer 5

• Text
• Allows arbitrary text data to be associated with the domain name.

Question 6

What is PTR?

Answer 6

• Pointer
• Pointer to the canonical name which is used to perform reverse DNS lookup.

Question 7

What is SOA?

Answer 7

• Start of Authority
• A record of information containing data on DNS zones and other DNS records.

Question 8

What is NS?

Answer 8

• Name Server
• A server that stores and organizes DNS records, which pair domains with IP addresses.

Question 9

What is SRV?

Answer 9

• Service Locator
• Specify information about services available on a network.

Question 10

What is Authoritative DNS Server?

Answer 10

• A server that stores and organizes DNS records, which pair domains with IP addresses.

Question 11

What is Non authoritative DNS Server?

Answer 11

• Known as caching resolvers
• An intermediary server that helps resolve DNS queries by contacting authoritative servers.

Question 12

What is DNS forward zone?

Answer 12

It maps domain names to their corresponding IP addresses, which is essential for resolving internal domain names efficiently.

Question 13

What is DNS secondary zone?

Answer 13

Helps provide redundancy and load balancing for a primary DNS server.

Question 14

What is DNS reverse zone?

Answer 14

Is used for the opposite purpose of a forward zone, mapping IP addresses back to their domain names.

Question 15

What is DNS authoritative zone?

Answer 15

A type of DNS zone where the server has the authority to manage the DNS records for a specific domain

Question 16

What is Recursive DNS Server?

Answer 16

• Act as a middleman between the end user and the authoritative DNS server. * Store responses to previous DNS requests in their cache, which allows them to quickly respond to new requests.

Question 17

What is DNSSEC?

Answer 17

• DNS Security Extensions (DNSSEC)
• Provides a digital seal for DNS data to ensure it hasn’t been tampered with

Question 18

What is DoH?

Answer 18

• DNS over HTTPS (DoH)
• Encrypts DNS queries sent through HTTPS

Question 19

What is DoT

Answer 19

• DNS over TLS (DoT)
• Encapsulates DNS traffic in a Transport Layer Security (TLS) tunnel