Communicating On The Internet

TCP/IP is the only protocol  used to send data all around the Internet. TCP/IP is really two individual sections,(Tcp) a set of communication protocols and (Ip) a unique address. Every machine connected to the internet must have an address by which it can be located on the internet.This is called the IP address of the machine.

Domain
A unique IP address therefore points to an actual computer connected via a gateway to the internet.This computer is known as a domain i.e.a place where information is available.This is a physical domain on the Internet.

Virtual Domain
           Virtual Domain are identified by a name(e.g. www.microsoft.com). Virtual Domain names need to be unique on the internet.All virtual domain names must be registered with interNIC.

Multiple Virtual Domains hosted on a Single Physical Domains
           A single computer having a permanent IP address and connected to the internet can host multiple virtual domains on its hard disk drive. Host servers offer several additional services such as multiple e-mail boxes,web site creation,web site creation tools and so on.

Internet Domains:
          Each computer that has a permanent IP address,runs server software and offers information to clients,is considered to be a Physical Domain.

The Physical Domain
          All internet servers are connected to the internet via an internet gateway.