6.5 Pt 1

Question 1

How do Domain Name Service (DNS) queries resolve host names and domains to IP addresses?

Answer 1

Check Cache
THEN
Check Recursive Resolver -> Root -> TLD -> Authoritative

Question 2

What is the role of the root servers in the DNS hierarchy?

Answer 2

Either gives IP address or refers request to next lvl down

Question 3

In DNS, what is the difference between a zone and a domain?

Answer 3

Zone is a collection domains

Question 4

What is the difference between a forward lookup zone and a reverse lookup zone?

Question 5

What functions do different record types have, such as A records and PTR records?

Question 6

What methods can be used to ensure the security of name queries?

Question 7

What’s a host name?

Answer 7

Assigned to PC by admin

Question 8

What’s a FQDN?
What are the 2 parts of it?

Answer 8

Fully Qualified Domain Name
Unique ID for host on a network
.
Host name / Domain Suffix

Question 9

nut.widget.example
What’s the host name?
What’s the domain name?

Answer 9

Host name: nut
Domain name: widget.example

Question 10

FQDN rules (4)

Answer 10

Unique name
Length < 63 characters
DNS uses letter, digit, hyphens
Not case sensitive

Question 11

DNS Hierarchy (6)

Answer 11

Root
TLD: Top Lvl Domain
CCS: Country Code Sub
D: Domain
SD: SubDomain
RS: Resource Record

Question 12

https://mail.example.co.uk/info.html
Break down each lvl

Answer 12

Root: .
TLD: uk
CCS: co
Domain: example
Subdomain: mail
Resource Record: /info.html

Question 13

https://www.brainscape.com/l/dashboard/

Answer 13

Root: .
TLD: com
Domain: brainscape
Subdomain: www
Resource Record: /l/dashboard/

Question 14

What is a recursive lookup?

Answer 14

If queried server is not authoritative, queries other name servers