Domain Name System

Question 1

Authoritative Server

Answer 1

The authoritative nameserver is the last stop in the nameserver query. If the authoritative name server has access to the requested record, it will return the IP address

Question 2

Recursive DNS Server

Answer 2

Makes requests until it reaches the authoritative server

Question 3

Fast Flux DNS

Answer 3

Rapidly changes IP address associated with one domain

Question 4

TLD

Answer 4

Last portion of the hostname: e.g .com

Question 5

Hostname

Answer 5

A hostname is a unique label assigned to a device connected to a computer network

Question 6

Nameserver

Answer 6

Root nameserver - The root server is the first step in translating (resolving) human-readable host names into IP addresses.

Question 7

Recursive query

Answer 7

A recursive query tells the querying DNS server or resolve that it should provide an answer or start a recursive process

Question 8

Iterative query

Answer 8

Provides a referral to other DNS servers

Question 9

Non-recursive query

Answer 9

The DNS server will proceed to return the answers from its own local cache or database.

Question 10

A record

Answer 10

The A record maps the requested hostname to the corresponding IPv4 address

Question 11

AAAA record

Answer 11

The AAAA record is similar to an A record, however, it works with IPv6 addresses

Question 12

Cname

Answer 12

Also known as Canonical Name record, the CNAME record is used as an alias to another hostname

Question 13

SOA

Answer 13

Short for Start of Authority, the SOA record serves as an administrative record for a domain name zone.

Question 14

SRV

Answer 14

Identifies locations for other protocols

Question 15

PTR Record

Answer 15

Short for Reverse-lookup Pointer, the PTR record is used to map a reverse mapping from an IP to a fully qualified hostname.

Question 16

NS Record

Answer 16

Short for Name Server record, the NS record contains the information about the nameservers responsible for providing DNS information for the queried domain, for example ns1.doman.com.

Question 17

TXT Record

Answer 17

The TXT or Text record is used to carry human or machine readable text data. This can be used for various purposes such as verification, authentication

Question 18

MX Record

Answer 18

Short for Mail Exchanger, the MX record specifies the hostname of an SMTP email server for the domain.

Question 19

Passive DNS

Answer 19

Records historical IP to Domain resolutions over time