Saturday, 1 October 2011

Internet is known as a Network of Networks. Every Computer that is connected to the Internet is a part of a Network, even the one in your home. For example , you may use a modem and dial a local number to connect to an Internet Service Provider (ISP). At work, you may be part of a Local Area Network (LAN), but you most likely still connect to the Internet using an ISP that your company has contracted with. When you connect to a larger network and become a part of their network. The Internet is simply a network of Networks.

Most large communications companies have their won dedicated backbones connecting various regions. In Each region, the company has a Point of Presence (POP). The POP is a place for local users to access the company’s Network, often through a local phone number or dedicated line. The amazing thing here is that there is no overall controlling network. Instead, there are several high level networks connecting to each other through Network Access Point or NAP s
When you connect to the Internet, Your computer become a part of a network.
In the real internet, dozens of large internet providers interconnect at NAPs in various cities, and trillions of bytes of data flow between the individual networks at these point. 
The internet is a collection of huge corporate networks that agree to all intercommunicate with each other at the NAPs. In this way every computer on the internet connects to every other.
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