Chapter 9 - DNS Basics

Question 1

What two files are used for local DNS resolution and configuration?

Answer 1

/etc/hosts and /etc/resolv.conf

Question 2

What is a recursive lookup?

Answer 2

A lookup from the client to the name server is recursive

Question 3

What is an iterative lookup?

Answer 3

A lookup from one name server to another is iterative

Question 4

What is the primary difference between domains and zones?

Answer 4

Domains are groups of hosts and subdomains, zones are groups of hosts but not subdomains

Question 5

True or False: A Primary master DNS server (master name server) also can be a Secondary DNS server (slave name server)

Answer 5

True

Question 6

Other than primary and secondary name servers what other types of name servers can you create?

Answer 6

Caching Name Servers

Question 7

Describe the benefits of negative record caching (negative TTL’s).

Answer 7

Negative TTL will caching “negative” responses

Question 8

How are reverse lookup zones organized in the DNS hierarchy?

Answer 8

They are organized by their IP addresses under the in‐addr.arpa subdomain.