Which step in the link-state routing process involves a router building a link-state database based on received LSAs?

The correct answer pertains to the process of a router constructing a link-state database using received Link-State Advertisements (LSAs). This is crucial because the link-state database contains the complete information about the network topology, allowing routers to understand the state and cost of each link in the network.

When routers exchange LSAs, they gather information about neighbors and their respective states, which they then use to create a comprehensive view of the network topology. This detailed view is essential for efficient route calculation, as it enables the router to apply algorithms like Dijkstra’s to determine the best path for data packets.

The terminology used in the other options does not align with this specific phase of the link-state routing process. For instance, the adjacency table tracks the routers with which a router has established direct communication (adjacencies), while the routing table contains the best paths to destinations based on the information from the link-state database. The neighbor table also focuses on immediate connections with other routers. Thus, the process of constructing a topology table, which organizes the details supplied by LSAs, is indeed the appropriate step in building the link-state database.