Overview of the DNS Namespace

How easy DNS namespace DNS resolver fined a computer. That Namespace hierarchy organization Distribution of information to multiple servers.

Root Domain

Dot (.) Represents the root domain, but did not enter it in the Web browser. That suppose dot (.). Next time, you Type the address of a computer; try to add at the end of the period (for example, www.google.com). A total of 13 vessels Global domain server.

Top-Level Domain

The first top-level domain (TLD) DNS name space. Examples of top-level domain Internet including .COM, .NET, .ORG, .BIZ and Biz. Most recognized domain name .com, .net and .org, and .gov, this is the US government. There are several domain names at this level, and each country has top-level domain. For example, Canada's .CA TLD, and is used in combination with TLD Kingdom .uk. A method of fixing the domain organization, referred to as the Internet Corporation for Assigned Names and Numbers (ICANN), occasionally adds a new top-level domain.

Second-Level Domain

Appeared before the domain name portion of the secondary domain name TLDs. An example of two domain names in the field of Microsoft www.microsoft.com. That second domain name registration organization to control them. Anyone can sign up for a two Internet domain name registration services. Many second- level domain only rules What kind of individual or organization can register a domain name. For example, only non-profit organizations

Use .ORG.

Subdomain
Subdomain before the second and top- level domain. An example WWW subdomain domain name is www.google.com . Subdomain DNS servers specified the second level of the DNS server to save the organization.
Fully Qualified Domain Name
Fully qualified domain name (FQDN) is a computer specific DNS name Subdomains and root domain name. For example, if the computer is designated as server 1 Thesales.south.contoso.com FQDN of domain computers server1.sales.south.cambodia.com.