Networks

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A computer network is a system of interconnected computers or terminals. It helps in sharing resources such as computers, peripherals, and terminals, and also helps in sending data from one place to a…

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The three essential elements are sender, medium, and receiver. The sender creates the message, the medium carries the message, and the receiver gets the message.

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Sender creates the messages to be transmitted. Medium carries the transmitted messages to the destination. Receiver gets the messages from the source. Example: in a telephone call, one person speaks a…

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A communication system helps different communication networks work together so that effective communication can take place between the source and the destination.

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Transmission media is the path used to send data from one point to another. It can be wire-based, such as cables, or wireless, such as radio waves and microwaves.

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Wire-based transmission uses a cable to connect devices. Wireless transmission uses no wires and sends signals through the air as electromagnetic waves. Examples of wire-based media include coaxial ca…

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An analog signal is a continuously varying signal. It is shown as a sine wave. Examples include human voice in the air, radio transmission waves, and TV transmission waves.

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A digital signal works on discrete data and has only two states, such as true and false or high and low. Its pattern is shown as a square wave. Computer data is digital in nature.