Friday, 9 March 2018

Overview of Internet

Overview of Internet.

Internet is defined as an Information super Highway, to access information over the web. However, It can be defined in many ways as follows:
Internet is a world-wide global system of interconnected computer networks.
Internet uses the standard Internet Protocol (TCP/IP).
Every computer in internet is identified by a unique IP address.
IP Address is a unique set of numbers (such as 110.22.33.114) which identifies a computer location.
A special computer DNS (Domain Name Server) is used to give name to the IP Address so that user can locate a computer by a name.
For example, a DNS server will resolve a name http://www.tutorialspoint.com to a particular IP address to uniquely identify the computer on which this website is hosted.
Internet is accessible to every user all over the world.

Evolution
The concept of Internet was originated in 1969 and has undergone several technological & Infrastructural changes as discussed below:
The origin of Internet devised from the concept of Advanced Research Project Agency Network (ARPANET).
ARPANET was developed by United States Department of Defense.
Basic purpose of ARPANET was to provide communication among the various bodies of government.
Initially, there were only four nodes, formally called Hosts.
In 1972, the ARPANET spread over the globe with 23 nodes located at different countries and thus became known as Internet.
By the time, with invention of new technologies such as TCP/IP protocols, DNS, WWW, browsers, scripting languages etc.,Internet provided a medium to publish and access information over the web.

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Type of Website

PORTAL A web site that offers variety of internet services from single, convenient location. Example : Yahoo.com, MSN.com ...