Most prominently, it translates more readily memorized domain names to the numerical IP addresses needed for locating and identifying computer services and devices with the underlying network protocols.
By providing a worldwide, distributed directory service, the Domain Name System is an essential component of the functionality on the Internet, that has been in use since 1985.
The Timeline is an interactive visualization chart to visualize data in time.
The data items can take place on a single date, or have a start and end date (a range).
It defines the DNS protocol, a detailed specification of the data structures and data communication exchanges used in the DNS, as part of the Internet Protocol Suite.
Historically, other directory services preceding DNS were not scalable to large or global directories as they were originally based on text files, prominently the HOSTS. The Internet maintains two principal namespaces, the domain name hierarchy The Domain Name System maintains the domain name hierarchy and provides translation services between it and the address spaces.
This mechanism provides distributed and fault tolerant service and was designed to avoid a single large central database.
The Domain Name System also specifies the technical functionality of the database service that is at its core.
In such a deployment, a partition of the DNS namespace is set aside for Active Directory, where a DNS domain name such as corp.is used support the Active Directory forest root domain, and then subdomains of this name are created to suit additional Active Directory domains as needed.
Active Directory is dependent on DNS as a domain controller location mechanism and uses DNS domain naming conventions in the architecture of Active Directory domains.
In Windows 2000 Server and Windows Server 2003, the directory service is named Active Directory.
In Windows Server 2008 and Windows Server 2008 R2, the directory service is named Active Directory Domain Services (AD DS).
The A group represents 10 to 20% by number of items, and 50 to 70% by projected dollar volume.