![]() ![]() For instance, routers and switches physically connect to each other with cables, and with wireless, to create networks. What does a router do? What does a switch do? ![]() Stop and think about what networking devices do. Then this section explains how some centralized controller software, called a controller, creates an architecture for easier programmatic control of a network. It starts by breaking down some of the components of what exists in traditional networking devices. This first major section explains the most central concepts of SDN and network programmability. At the end of that rearrangement, the devices in the network still forward messages, but the how and why have changed. Network programmability and Software Defined Networking (SDN) take those ideas, analyze the pieces, find ways to improve them for today’s needs, and reassemble those ideas into a new way of making networks work. You have learned about how switches and routers do that forwarding for the entire length of preparing for the CCNA exam. Networking devices forward data in the form of messages, typically data-link frames like Ethernet frames.
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