You've learned how dynamic routing protocols automate path selection.
Distance Vector vs Link State:
- Distance vector shares routing tables with neighbors (RIP, EIGRP)
- Link state shares topology information with everyone (OSPF)
RIP: Uses hop count, limited to hops. Too slow for production networks.
OSPF: Open standard, hierarchical areas, fast convergence. Most widely deployed IGP.
EIGRP: Uses DUAL for instant failover when feasible successors exist.
Choosing protocols: OSPF for multi-vendor, EIGRP for Cisco shops, RIP only for legacy.