Internet works, Intranet and Extranet
An internet work can be defined as two or more computer networks, which are connected together,using network routers.
Each network in an internet work has its own network address, which is different form other networks inside from other networks inside the internet works.Network address is used to identify the networks inside a internet works.
INTRANET AND EXTRANET
An internet is privet network that is contained within an enterprise.It may consist of many interlinked local area networks and use any wide area networks and use any technologies for networks connectivity.The main purpose of internet is so share company information and computing resources among employees.
An extranet can be viewed as part of day-to-day of a company internet that is extended to user outside the company like suppliers, vendors , partners, customers or other business associated.
Extranet is required for normal day-to-day business activities.For example vendors billing &invoices,payment , Discounted price lists for partners etc…