Unit 4

Question 1

What is the purpose of DNS?

Answer 1

Translate domain names into IP addresses

Question 2

What three components make up DNS?

Answer 2

1. Resolvers
2. Resource Records
3. Name Servers

Question 3

What is any host or client on the internet needing to look up domain information
(can be software as well).

Answer 3

a Resolver

Question 4

What entry in the DNS database contains information regarding the domain names?

Answer 4

Resource Records

Question 5

Resource records are contained in files called ______

Answer 5

Zones

Question 6

What are the name server roles?
(3)

Answer 6

1. Primary name server (Master Name Server when sharing zone files)
2. Secondary name server
3. Caching-only name server

Question 7

What zone in the DNS name space resolves a host name to an IP address?

Answer 7

Forward Lookup Zone

Question 8

What zone in the DNS name space resolves IP addresses to host names?

Answer 8

Reverse Lookup Zone

Question 9

A DNS query is also known as a _______

Answer 9

Lookup

Question 10

What are the three types of DNS queries?

Answer 10

1. Recursive Query
2. Iterative Query
3. Non-Recursive Query

Question 11

What type of query occurs when a DNS client provides a host name and the DNS resolver “must” provide an answer?

Answer 11

Recursive Query

Question 12

In a Recursive query which DNS server does the resolver start the query processes from?

Answer 12

Local DNS Server

Question 13

What type of DNS query occurs when a DNS client provides a host name and the DNS
resolver returns the “best” answer it can?

Answer 13

Iterative Query

Question 14

What type of DNS query occurs when a response is immediately returned to the client
because the record is stored in a local cache?

Answer 14

Non-Recursive Query

Question 15

How many root domain name servers are there worldwide?

Answer 15

13