What type of routers can be found within a single OSPF area?

In OSPF (Open Shortest Path First), routers within a single area must maintain a consistent view of the network topology to ensure efficient routing. When routers have the same link-state information, it means they all have the same understanding of the network's layout and can generate identical link-state databases. This consistency is critical because OSPF uses this information to compute the shortest path to each destination, ensuring that all routers within that area can make accurate routing decisions based on a unified dataset.

Having routers with differing link-state information would lead to mismatches in routing tables and possible routing loops, undermining OSPF's reliability. Routers using different routing protocols would naturally contain different routing tables and methodologies for exchanging routing information, which would prevent OSPF from functioning properly within those networks. While it is true that any routers can exist in a broader network, only those that share similar link-state information will effectively work together within the confines of an OSPF area, ensuring a cohesive and accurate routing infrastructure.