Domain Name System (DNS) is a hierarchical naming system for computers, services, and other resources connected to the Internet. Each host on the Internet is assigned a unique name, which is known as a domain name, using the Domain Name System.
The DNS protocol enables systems to locate resources by name.
A DNS zone is a collection of one or more authoritative DNS servers that are responsible for managing a particular set of DNS zones. A DNS zone is a logical subdivision of the global DNS namespace.
A DNS server can be configured to answer queries for any domain name in its zone, or it can be configured to selectively answer queries for specific domain names.
A domain is a logical subdivision of the global DNS namespace. A domain is the equivalent of a physical network segment in the world of computers. A domain name is the name assigned to a host on a network. A domain name is composed of a top-level domain (TLD) and a second-level domain (SLD). A TLD is a category of domain names under the control of the International Organization for Standardization (ISO). There are currently over 190 TLDs in use.
A SLD is a category of domain names under the control of the National Organization for Standardization (NISO). There are currently over 190 SLDs in use. For example, the domain name www.google.com is a SLD.
A DNS server can be configured to answer queries for any domain name in its zone, or it can be configured to selectively answer queries for specific domain names.
