Week 4 Name Resolution

Question 1

Domain name system (DNS)

Answer 1

A global and highly distributed network service that resolves strings of letters into ip address for you

Question 2

Domain name

Answer 2

A term used for something that can be resolved by DNS

Question 3

Name resolution

Answer 3

Process of using DNS to turn a domain name into ip address is known as name resolution

Question 4

There are five primary types of DNS servers

Answer 4

1. Caching name servers
2. Recursive name servers
3. Root name servers
4. TLD name servers
5. Authoritative name servers

Question 5

Caching and recursive name servers

Answer 5

Is to store known domain name lookups for a certain amount of time

Question 6

Recursive name servers

Answer 6

Performs full DNS resolution requests

Question 7

Time to live (TTL)

Answer 7

A value, in seconds, that can be configured by the owner of a domain name for how long a name server is allowed to cache an entry before it should discard it and perform a full resolution again

Question 8

Anycast

Answer 8

Technique used to route traffic to different destinations depending on factors like location, congestion, or link health

Question 9

Top level domain(TLD)

Answer 9

Represents the top of the hierarchical DNS name resolution system

(.com)

Question 10

How many root servers are there?

Answer 10

13

Question 11

What are the benefits of using DNS?

Answer 11

1. Allows administrative changes to happen seamlessly.
2. Easier for humans to remember websites names.