C1 - Registration Records

Question 1

What is WHOIS?

Answer 1

A public database that houses the information collected when someone registers a domain name or updates their DNS settings.

Question 2

What information does WHOIS show?

Answer 2

IP range, Registrar, Organisation/Owner, Assigned date, Geographical location

Question 3

What does DNS stand for?

Answer 3

Domain Name Server

Question 4

What is DNS?

Answer 4

Distributed database used to map IP addresses to hostnames and vice versa and provides email routing information.

Question 5

What is a DNS Query?

Answer 5

A message that a client sends to the DNS server.

Question 6

How does a DNS query work?

Answer 6

It contains a list of question that DNS server answers.

Can contain multiple questions that the server will reply to, but server can also reply with additional information.

Question 7

What is Recursive query?

Answer 7

A recursive query directs the DNS server to fully resolve the domain name and provide a final answer. If the server doesn’t know the IP, it queries other servers until it succeeds or fails.

Question 8

What is a iterative query?

Answer 8

DNS server will return the best answer it has, either the final IP address or a referral to another DNS server (usually a higher-level domain server).

Question 9

What is non-recursive query?

Answer 9

A DNS server returns the requested hostname if it has the information in its cache. If not, it responds with an empty answer.

Question 10

What the three types of DNS queries?

Answer 10

Recursive, Non-recursive, Iterative

Question 11

What is a DNS zone transfer?

Answer 11

Propagates current DNS zone material to other name servers that support the operation.

Question 12

What port is a DNS zone transfer done on?

Answer 12

Port 53

Question 13

What command is used to perform a DNS zone transfer?

Answer 13

dig
dig axfr
nslookup

Question 14

What command is used to perfrom a reverse DNS zone transfer?

Answer 14

dig -x

Question 15

What does SOA stand for in DNS records?

Answer 15

Start of Authority

Question 16

What does MX stand for in DNS records?

Answer 16

Mail Exchange

Question 17

What does TXT stand for in DNS records?

Answer 17

Text String

Question 18

What does A stand for in DNS records?

Answer 18

Address (IPv4)

Question 19

What does NS stand for in DNS records?

Answer 19

Name server

Question 20

What does PTR stand for in DNS records?

Answer 20

Pointer

Question 21

What does HINFO stand for in DNS records?

Answer 21

Host information

Question 22

What does CNAME stand for in DNS records?

Answer 22

Canonical name

Question 23

What does the SOA record tell?

Answer 23

Source host where the DNS zone was created.

Question 24

What does the MX record tell?

Answer 24

Mail servers for a given domain.

Question 25

What does TXT record tell?

Answer 25

Materials including SPF and DKIM fields used to provide security, depending on configuration

Question 26

What does A record tell?

Answer 26

IPv4 addresses for a hostname

Question 27

What does the AAAA record tell?

Answer 27

Maps a domain name to IPv6 address

Question 28

What does the NS record tell?

Answer 28

Name of authorative DNS servers for a given domain

Question 29

What does the PTR record tell?

Answer 29

Hostname of a given IPv4 or IPv6 address

Question 30

What does HINFO record tell?

Answer 30

Operating system or other information of a host.

Question 31

What does the CNAME record tell?

Answer 31

Hostname which the CNAME is an alias of