1. Internet :
The network formed by the co-operative interconnection of millions of computers, linked together is called Internet. Internet comprises of :
- People : People use and develop the network.
- Resources : A collection of resources that can be reached from those networks.
- A setup for collaboration : It includes the member of the research and educational committees worldwide.
2. Intranet :
It is an internal private network built within an organization using Internet and World Wide Web standards and products that allows employees of an organization to gain access to corporate information.
3. Extranet :
It is the type of network that allows users from outside to access the Intranet of an organization.
Difference between Internet, Intranet and Extranet :
|Point of difference||Internet||Intranet||Extranet|
|Accessibility of network||Public||Private||Private|
|Availability||Global system.||Specific to an organization.||To share information with suppliers and vendors it male the use of public network.|
|Coverage||All over the world.||Restricted area upto an organization.||Restricted area upto an organization and some of its stakeholders or so.|
|Accessibility of content||It is accessible to everyone connected.||It is accessible only to the members of organization.||Accessible only to the members of organization and external members with logins.|
|No. of computers connected||It is largest in number of connected devices.||The minimal number of devices are connected.||The connected devices are comparable with Intranet.|
|Owner||No one.||Single organization.||Single/ Multiple organization.|
|Purpose of the network||It’s purpose is to share information throughout the world.||It’s purpose is to share information throughout the organization.||It’s purpose is to share information between members and external, members.|
|Security||It is dependent on the user of the device connected to network.||It is enforced via firewall.||It is enforced via firewall that separates internet and extranet.|
|Users||General public.||Employees of the organization.||Employees of the organization which are connected.|
|Policies behind setup||There is no hard and fast rule for policies.||Policies of the organization are imposed.||Policies of the organization are imposed.|
|Maintenance||It is maintained by ISP.||It is maintained by CIO. HR or communication department of an organization.||It is maintained by CIO. HR or communication department of an organization.|
|Economical||It is more economical to use.||It is less economical.||It is also less economical.|
|Relation||It is the network of networks.||It is derived from Internet.||It is derived from Intranet.|
|Example||What we are normally using is internet.||WIPRO using internal network for its business operations.||DELL and Intel using network for its business operations.|