Which data structure is maintained on each OSPF router to store link-state information?

• A. Routing Table
• B. Link-State Database
• C. Forwarding Information Base
• D. Neighbor Table

Answer: (B)

OSPF routers keep a Link-State Database that holds all the topology information described by link-state advertisements. Each router floods these advertisements to neighbors, and every router stores them in its LSDB to maintain a complete, synchronized view of the network topology. With this shared view, the router runs the SPF algorithm to compute shortest paths and builds the routing table for forwarding. The Forwarding Information Base is the actual forwarding structure used by the data plane, derived from the routing table, while the Neighbor Table tracks adjacency status with neighbors. So the data structure that stores the link-state information is the Link-State Database.