DNS Basics

Question 1

What does DNS stand for?

Answer 1

Domain Name Service

Question 2

From a high level, what does DNS do?

Answer 2

Provides lookup services to translate a URL into an IP address.

Question 3

What is gTLD?

Answer 3

gTLD - generic top level domains (such as .com, .net, .org, .guru)

Question 4

True or false: DNS is a hierarchical and distributed system?

Answer 4

True

Question 5

Who controls top level domains?

Answer 5

IANA (Internet Assigned Numbers Authority)

Question 6

what are top-level domains that are country specific?

Answer 6

ccTLD - country code top-level domains

Question 7

from where are ccTLDs managed?

Answer 7

Organizations within their respective country

Question 8

top-level domains that are reserved for specific purposes or members of a group are called what?

Answer 8

sTLD - sponsored top-level domain. for example, the .aero TLD is reserved for organizations in the aerospace industry.

Question 9

What is a DNS root server?

Answer 9

It answers client requests in the domain name system’s root zone.

Question 10

What is the DNS root zone?

Answer 10

The top-level DNS zone in a hierarchical namespace of the DNS, or the TLD (.com, .org, .guru, .aero) This includes all types of TLDs such as country code, sponsored, etc.

Question 11

Who controls Root Zones?

Answer 11

IANA - Internet Assigned Numbers Authority

Question 12

Roughly how many root-zone servers exist around the globe?

Answer 12

over 300

Question 13

What is an authoritative server

Answer 13

One that contains a zone file for a domain. It contains additional information for that domain.

Question 14

What is a non-authoritative server

Answer 14

One that only caches details of that domain