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Communication network based on point-to-point communication

In a short period of time computer networks have become an indispensable part of business, industry, entertainment as well as a common-man's life
. These applications have changed tremendously from time and the motivation for building these networks are all essentially economic and technological
. Initially, computer network was developed for defense purpose, to have a secure communication network that can even withstand a nuclear attack
. After a decade or so, companies, in various fields, started using computer networks for keeping track of inventories, monitor productivity, communication between their different branch offices located at different locations
. For example, Railways started using computer networks by connecting their nationwide reservation counters to provide the facility of reservation and inquiry from any where across the country
. And now after almost two decades, computer networks have entered a new dimension; they are now an integral part of the society and people
. In 1990,s computer network started delivering services to private individuals at home
. These services and motivation for using them are quite different
. Some of the services are access to remote information, person-person communication, and interactive entertainment
. So, some of the applications of computer networks that we can see around us today are as follows: Marketing and sales: Computer networks are used extensively in both marketing and sales organizations
. Marketing professionals use them to collect, exchange, and analyze data related to customer needs and product development cycles
. Sales application 

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