DNS

Question 1

What is DNS?

Answer 1

protocol to resolve names and ip addresses

- IPv4&6

Question 2

DNS should be configured for?

Answer 2

High availability (HA)

Question 3

what is DNS namespace?

Answer 3

World wide unique naming architecture with distributed administration
- Top level domains on root server
- second level domains and lower are maintained by registered owners
(known as delegations)

Question 4

What are the 4 domain levels?

Answer 4

• top level domain - “.local”
• second level domain - “ drost.local “
• sub domain - “mail.drost.local”
• hosts - “pc15.mail.drost.local”

Question 5

What is DNS authority?

Answer 5

registered owner authoritative for domain name
– maintains domain name zones
forward lookup zones - name to IP
Reverse look up zones - ip to name
- zone is also a database (file) containing records

Question 6

What are the different DNS record types?

Answer 6

• Start of Authority (SOA)- required for all zones
• Name server (S) - Name of the DNS server authoritative for domain- require for all zones
• Host (A or AAAA)- host name and IP for forward look up in domain
• Mail Exchange (MX) - domain smtp server
• Alias (CNAME) - alternative name for host
• Pointer (PTR) host name and ip for reverse lookup zones
• Server resource (SRV) - location of network services critical to AD

Question 7

What are the two types of DNS resolution?

Answer 7

iterative

recursive

Question 8

What is the benefit of External Name Resolution?

Answer 8

They dont expose AD DNS zones to the internet

Question 9

What is dns Ha- AD integrated

Answer 9

• zone data stored in ADDS database
  DNS servers- are AD domain controllers
  AD integrated zones are stored and replicated with Active Directory, and can be configured to replicate to all DNS servers in the domain or the forest. That provides high availability, fault tolerance, and easy setup when running DNS on domain