OSI model layer task

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Layer Task

=>A network is a combination of hardware and software that send data from one location to another.
=>The hardware consists of physical equipment that carries signals from one point of the network to another.
=>The software consists of instruction sets that make possible the services that we expect from a network.

Layer Task (Example)

For example let us consider who communicate through postal mail.
=>The process of sending a letter to a friend would be complex if there were no services available from the post office.
=>The following figure shows the tasks involved in sending a letter.

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