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Cisco Digital Network Architecture: Intent-based Networking for the Enterprise, First Edition by Simone Arena, Matthias Falkner, David Zacks, Tim Szigeti

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Chapter 9

Protocol Innovations

Let’s discuss protocols. Specifically, network protocols, and how they are evolving as the future of networking takes shape.

To begin with, what is a protocol? And more specifically, what is a communications protocol?

In a nutshell, communications protocols basically govern how systems, including devices, users, and applications, talk to each other. Networking protocols govern how the network is created, how it is maintained, and how systems communicate using it.

Networking protocols date back to the very dawn of the network age. The very first modern computer network created was ARPAnet, in 1969. It used a series of protocols (1822 and NCP) to deliver datagrams between hosts. As time progressed, the ARPAnet moved ...

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