Question

A network engineer enables OSPFv2 on a router's Loopback0 interface (192.168.10.1/24) using the 'network 192.168.10.0 0.0.0.255 area 0' command. After the adjacencies form, a neighboring router shows the loopback prefix in its routing table. How does OSPF advertise this loopback network by default, and why?

Accepted Answer

As a /32 host route (192.168.10.1/32) because OSPF treats loopback interfaces as the loopback network type by default

Answer

As the full /24 network (192.168.10.0/24) because OSPF always advertises the configured interface mask

Answer

It is not advertised at all because loopback interfaces cannot participate in OSPF

Answer

As a /24 route with an infinite metric because loopbacks are treated as stub links only