What is the primary function of link-state protocols?

The primary function of link-state protocols is to maintain a complete topology of the network for accurate routing information. Unlike distance-vector protocols, which share routing information only with immediate neighbors, link-state protocols collect information about the entire network and share their view of the network topology with all other routers.

When a link-state protocol is in use, each router generates a link-state advertisement (LSA) that contains information about its directly connected neighbors and the state of those links. This information is flooded throughout the network, allowing every router to build a complete and synchronized map of the network. With this comprehensive view, routers can accurately compute the best paths for data packets, contributing to more efficient and reliable routing.

This function is essential for ensuring that routing decisions are based on the current state of the entire network, leading to better route optimization and faster convergence during topology changes. Therefore, maintaining a complete topology is a fundamental characteristic and advantage of link-state routing protocols.