Which two protocols are classified as link-state routing protocols?

Link-state routing protocols are designed to efficiently manage and disseminate routing information within an autonomous system by using a more dynamic approach compared to distance-vector protocols. In link-state routing, each router maintains a complete view of the network by exchanging information about their direct connections with neighboring routers. This enables routers to independently compute the best path to all destinations in the network.

The two protocols classified as link-state routing protocols in this context are IS-IS and OSPF. Both of these protocols share several key characteristics that define link-state routing:

1. Complete Network Topology: Both IS-IS and OSPF allow routers to build a complete map of the network topology, helping them make informed routing decisions based on the current state of the network.

2. Hierarchical Structure: OSPF supports a hierarchical network architecture, using areas to optimize routing and reduce overhead, while IS-IS also allows for a hierarchical structure through levels of routers.

3. Fast Convergence: Link-state protocols like OSPF and IS-IS converge more quickly than distance-vector protocols because they react to changes in the network topology by flooding Link-State Advertisements (LSAs) to inform all routers of the changes, which can help improve network efficiency