Static routes work for small networks, but they fail at scale. If you have routers and a link fails, you'd manually update routes on every affected device. That takes hours.
Dynamic routing protocols let routers discover neighbors, share network information, and calculate paths automatically. When a link fails, routers detect the change and recalculate routes within seconds.
In this section, I'll cover major protocols: RIP, OSPF, and EIGRP. You'll learn how each one shares information, calculates best paths, and handles failures. By the end, you'll know when to use each protocol.