Four Step of Invention of Networking

<aside> 📖 2000 BC

Systems to signal a small set of pre-defined messages, like beacons

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<aside> 📖 1600s

Systems to transmit arbitrary messages, like by encoding the alphabet

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<aside> 📖 1700s

Numeric codes for common words and phrases. “Compression”

</aside>

<aside> 📖 1700s

Codes for control signals. “Protocols”

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