Explain the term Domain Name Space.

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 Solution :-

 1. A domain namespace is a name service provided by the Internet for Transmission Control Protocol networks/Internet Protocol (TCP/IP). 

2. DNS is broken up into domains, a logical organization of computers that exist in a larger network.

3. The DNS database hierarchical naming scheme is called a domain name space. 

4. Each node in the hierarchy represents a partition of the DNS database. 

5. The nodes are known as domains, and each of them must have a name as the DNS database is indexed by name. When you add domains to the hierarchy, the name of the parent domain is appended to the domain, which becomes a child domain or subdomain.

6. The hierarchical structure of the domain name space consists of a root domain, top-level domains, second level domains, subdomains, and host names.

  • The Root Domain is at the top of the hierarchy and is represented by a period (.).
  • Top-Level Domains are two or three-character name codes, representing organisation type or geographic location, eg: .com, .gov, .edu, .uk, .es etc. Top-level domains can contain second-level domains and host names.
  • Second-Level Domains are registered to individuals and organisations for use on the Internet. A second-level name has two name components: a top-level name and a unique second-level name, eg: coatbank.com.
  • Subdomains are created when organisations extend their DNS tree to represent departments, divisions, or other geographic locations. Subdomains have three name components: a top-level name, a unique second-level name, and a unique name representing the department or location, eg: admin.coatbank.com.

7. Below is an example of the hierarchy of domain naming on the Internet.

8. In the above example, all websites are broken into regional sections based on the TLD (top-level domain). In the example of http://support.computerhope.com it has a ".com" TLD, with "computerhope" as its second level domain that is local to the .com TLD, and "support" as its subdomain, which is determined by its server.

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