IS-IS

IS-IS (Intermediate System to Intermediate System) is a protocol used by network devices to communicate and share routing information within large networks. Think of it as a GPS system for data, helping computers and routers find the best paths to send information efficiently. It organizes network devices into a structured hierarchy, enabling quick updates and stable connections, especially in complex or large-scale environments like the internet backbone or enterprise networks. Essentially, IS-IS ensures data reaches its destination accurately and efficiently by dynamically mapping the network's topology.