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Internet OverviewInternet Overview
Internet
Internet
Internet is defined as an Information super Highway, to access information over the web. However, It
Internet is defined as an Information super Highway, to access information over the web. However, It
can be defined in many ways as follows:
can be defined in many ways as follows:
Internet is a world-wide global system of interconnected computer networks. Internet is a world-wide global system of interconnected computer networks.
Internet uses the standard Internet Protocol (TCP/IP).
Internet uses the standard Internet Protocol (TCP/IP).
Every computer in internet is identified by a unique IP address. 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
IP Address is a unique set of numbers (such as 110.22.33.114) which identifies a computer
location.
location.
A special computer DNS (Domain Name Server) is used to give name to the IP Address so
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.
that user can locate a computer by a name.
For For example,example, aa DNSDNS serverserver willwill resolveresolve aa namename http://www.tutorialspoint.comhttp://www.tutorialspoint.com toto aa
particular IP address to uniquely identify the computer on which this website is hosted.
particular IP address to uniquely identify the computer on which this website is hosted.
Internet is accessible to every user all over the world.
Internet is accessible to every user all over the world.
Evolution Evolution
TheThe conceptconcept ofof InternetInternet waswas originatedoriginated inin 19691969 andand hashas undergoneundergone severalseveral technologicaltechnological &&
Infrastructural changes as discussed below:
Infrastructural changes as discussed below:
The origin of Internet devised from the concept of
The origin of Internet devised from the concept of Advanced Research Project Agency
Advanced Research Project Agency
Network (ARPANET). Network (ARPANET).
ARPANET
ARPANET
was developed by United States Department of Defense.
was developed by United States Department of Defense.
Basic purpose of ARPANET was to provide communication among the various bodies of Basic purpose of ARPANET was to provide communication among the various bodies of
government.
government.
Initially, there were only four nodes, formally called
Initially, there were only four nodes, formally called Hosts.
Hosts.
In 1972, the
In 1972, the ARPANET
ARPANET
spread over the globe with 23 nodes located at different countries
spread over the globe with 23 nodes located at different countries
and thus became known as
and thus became known as Internet.
Internet.
By the time, with invention of new technologies such as TCP/IP protocols, DNS, WWW, 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
browsers, scripting languages etc.,Internet provided a medium to publish and access
information over the web.
information over the web.
Advantages
Advantages
Internet covers almost every aspect of life, one can think of. Here, we will discuss some of the
Internet covers almost every aspect of life, one can think of. Here, we will discuss some of the
advantages of Internet:
advantages of Internet:
Internet allows us to communicate with the people sitting at remote locations. There are
Internet allows us to communicate with the people sitting at remote locations. There are
various apps available on the wed that uses Internet as a medium for communication. One various apps available on the wed that uses Internet as a medium for communication. One
can find various social networking sites such as:
can find various social networking sites such as:
Facebook
Facebook
Twitter
Twitter
Yahoo
Yahoo
Google+
Google+
Flickr
Flickr
Orkut
Orkut
There are always chances to loose personal information such as name, address, credit card
There are always chances to loose personal information such as name, address, credit card
number. Therefore, one should be very careful while sharing such information. One should
number. Therefore, one should be very careful while sharing such information. One should
use credit cards only through authenticated sites.
use credit cards only through authenticated sites.
Another disadvantage is the
Another disadvantage is the Spamming
Spamming .Spamming corresponds to the unwanted e-mails in
.Spamming corresponds to the unwanted e-mails in
bulk. These e-mails serve no purpose and lead to obstruction of entire system.
bulk. These e-mails serve no purpose and lead to obstruction of entire system.
Virus Virus can easily be spread to the computers connected to internet. Such virus attacks maycan easily be spread to the computers connected to internet. Such virus attacks may
cause your system to crash or your important data may get deleted.
cause your system to crash or your important data may get deleted.
Also a biggest threat on internet is pornography. There are many pornographic sites that can
Also a biggest threat on internet is pornography. There are many pornographic sites that can
be found, letting your children to use internet which indirectly affects the children healthy be found, letting your children to use internet which indirectly affects the children healthy
mental life.
mental life.
There are various websites that do not provide the authenticated information. This leads to
There are various websites that do not provide the authenticated information. This leads to
misconception among many people. misconception among many people.
