Which OSPF data structure is consistent across all routers in the same area?

The correct response is that the link-state database (LSDB) is consistent across all routers in the same OSPF area. This is fundamental to how OSPF (Open Shortest Path First), a link-state routing protocol, operates.

Each OSPF router within the same area maintains an identical link-state database, which contains information about all the links (or interfaces) and their states within that area. When OSPF routers first come online or when changes occur, they exchange link-state advertisements (LSAs) to ensure that each router has an accurate and up-to-date LSDB. This consistency allows all routers in the area to compute a common shortest path tree for routing packets, ensuring efficient and reliable communication across the network.

This synchronization is crucial for OSPF as it helps maintain a loop-free logical topology and enables routers to make informed routing decisions based on the same set of data about the network topology.