How The Web Works (THM)

Question 1

What is DNS?

Answer 1

Domain Name System
System that replaces IP Addresses with Names that are easy to remember and use.

Question 2

How are IP Addresses written?

Answer 2

4 sets of numbers ranging from 0-255 seperated by periods.

Question 3

Why does DNS exist?

Answer 3

Hard to remember IP Addresses in their original form.

Question 4

What is DNS divided into?

Answer 4

Domain Hierarchy.

Question 5

What are the 3 levels of Domain Hierarchy?

Answer 5

Root
TLD
SLD

Question 6

What is the Root Domain represented by?

Answer 6

. (period)

Question 7

What is TLD?

Answer 7

Top Level Domain

Question 8

What are the 2 types of TLD?

Answer 8

gTLD (General Top Level Domain)
ccTLD (Country Code Top Level Domain)

Question 9

What is the most common TLD?

Answer 9

.com

Question 10

What is SLD?

Answer 10

Second Level Domain

Question 11

What are the rules for SLDs?

Answer 11

a-z
0-9
cannot start or end with hyphens
cannot have consecutive hyphens
Maximum 63 characters

Question 12

What is a Subdomain?

Answer 12

SDL attached to SDL

Question 13

Where is a Subdomain located?

Answer 13

To the left of the SDL

Question 14

What are the rules for Subdomains?

Answer 14

a-z
0-9
Cannot start or end with a hyphen
Cannot have consecutive hyphens
0-253 characters (including SDL and other Sub-SDLs)
Can attach as many as you want to SDL

Question 15

What is a DNS Record Type?

Answer 15

The type of IP Address the Domain Names resolve to.

Question 16

What are the DNS Record Types?

Answer 16

A
AAAA
CNAME
MX
TXT

Question 17

What is the “A Record” DNS?

Answer 17

Resolves to IPv4

Question 18

What is “AAAA Record” DNS?

Answer 18

Resolves to IPv6

Question 19

What is “CNAME Record” DNS?

Answer 19

Resolves to another Domain Name

Question 20

What is “MX Record” DNS?

Answer 20

Resolves to address of servers that store backup email data for the website being queried

Question 21

What is “TXT Record” DNS?

Answer 21

Resolves to Text-Based Data