DNS

Question 1

What does your computer do before it goes to a DNS server?

Answer 1

It looks internally for the mapping information that it keeps in the filling system

Question 2

What internal files do computers use in windows to map to an IP address?

Answer 2

Hosts files

Question 3

What are top level domain nodes?

Answer 3

.com,.org, .net etc

Question 4

What are domain nodes (aka domain zones)

Answer 4

.google.com

Question 5

What is a sub domain?

Answer 5

play.google.com

Question 6

What does DNS use to make the service quicker?

Answer 6

Delegation. Some DNS servers may be delegated as .com, some as .org etc

Question 7

What does an A record and an AAAA record do?

Answer 7

(Address records)
A - provides mapping between an ipv4 address and host name.
AAAA- Same as above but for IPV6

Question 8

What does a CNAME record do?

Answer 8

Canonical record is correct and proper name for a server. Records alias so can be directed to correct site eg: goole.com to .i.goole.com

Question 9

What does a MX record do?

Answer 9

Mail exchange record. Records a list of mail servers for that domain

Question 10

What is a PTR record?

Answer 10

Opposite of an A record. If you provide IP address it will map to name. Used for reverse lookups

Question 11

What is an NS record?

Answer 11

Name server record. NS records map a domain name to a list of DNS servers which are authoritative for that domain.

Question 12

What is a SOA record?

Answer 12

Start of authority record. Indicates that this DNS server is the best source of information for the data within the DNS

Question 13

What does a SOA record contain?

Answer 13

• Email address of the person responsible for administering the domain zone file.
• Name of host where the file was created