In OSPF, what type of router is responsible for summarizing routes?

In OSPF (Open Shortest Path First), the router responsible for summarizing routes is the Area Border Router (ABR). ABRs serve as a connection point between different OSPF areas and can perform route summarization, which allows them to consolidate multiple contiguous networks into a single summary route when advertising to other areas. This capability is crucial for reducing the size of routing tables and improving the efficiency of route advertisements across the OSPF network.

When an ABR summarizes routes, it can help minimize the amount of routing information exchanged between areas, facilitating better network performance and reducing overhead. The summary routes that ABRs generate provide a simplified view of the network's topology, making it easier for routers in other areas to learn about networks without having to manage extensive details about every single subnet in the area.

In contrast, other types of routers, such as Autonomous System Boundary Routers (ASBRs), design routers (DRs), and designated internal routers (DISs), have different roles within the OSPF routing environment. ASBRs typically connect OSPF to non-OSPF networks and are responsible for importing and exporting routing information but not summarizing routes. DRs and DISs are part of the OSPF electing