ITF Block 4: Unit 4 Domain Name System (DNS)

What are the name server roles?

- Primary name server - Secondary name server - Master name server - Caching-only name server

What is the purpose of Domain Name System (DNS)?

- Provide name resolution for objects located in the Active Directory domain

What are the three types of DNS queries?

- Recursive Query - Iterative Query - Non Recursive Query

What three components make up DNS?

- Resolvers - Resource Records - Name Servers

How many root domain name servers are there worldwide?

13

Which name server role does not contain any zone information?

Caching-only name server

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

DNS Root Server

What zone in the DNS namespace is used for fault tolerance and to reduce network traffic. It is often used to keep copies of DNS domain information on more than one server?

DNS Zone Synchronization

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

Forward lookup zone

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

Iterative Query

A DNS Query is also Know as a _________.

Lookup

Which name server role provides zone information to secondary name servers?

Master name server

DNS has a hierarchical inverted tree structure. The DNS hierarchical inverted tree structure is called the DNS _________.

Namespace

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

Non-Recursive Query

What is the master copy of the zone database file, It is located on the primary DNS server for a particular zone and is stored as a standard file.

Primary Zone Database

Which name server role contains the master copy of the zone file for the zones it has authority over?

Primary name server

For DNS Zone synchronization the __________ and _________ zones are traditionally used to automatically synchronize DNS information between DNS servers.

Primary, secondary

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

Recursive Query

A ________ is a software running on a TCP/IP host that enables the host to query a name server to resolve a host name into its associated IP address.

Resolver

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

Resolver

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

Resource Records

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

Reverse lookup zone

What is a copy of the primary zone database. It is stored as a read-only text file on a secondary DNS server and can only be updated by the primary DNS server through a process known as a zone transfer.

Secondary Zone Database

Which name server role obtains its zone files using a zone transfer from a master name?

Secondary name server

(True/False) The resolver client is built into TCP/IP applications such as: - HTTP (Hypertext Transfer Protocol) - Web browsers (Google Chrome) - Email Clients (Outlook) - Programs requiring name to IP address resolution to enable communication on the network and the internet

TRUE

Resource records are contained in files called ________.

Zones