What is the function of an Area in OSPF?

The function of an Area in OSPF (Open Shortest Path First) is indeed to reduce routing overhead by segregating networks into manageable sections. OSPF uses a hierarchical network design which breaks a large routing domain into smaller, more manageable areas. This approach helps in limiting the number of routing entries each router must handle, which in turn improves performance and simplifies network management.

By defining areas, OSPF enables routers to maintain detailed information about the networks within their area while summarizing routes to other areas. This means that routing updates are only propagated within the area, thereby reducing unnecessary traffic and decreasing the overall load on the routers. Furthermore, it helps in maintaining an efficient OSPF topology by minimizing the size of the routing tables, leading to faster convergence and enhanced scalability of the network.

The other options do not accurately reflect the primary role of areas in OSPF, as areas are not used to increase the number of routers, manage IP address ranges, or enforce security policies. Instead, their main purpose is primarily aligned with managing routing efficiency and reducing the complexity of routing information in larger networks.