Which Cisco IOS command is used to prevent a configured OSPF interface from forming a neighborship with any potential neighbors?

The command used to prevent a configured OSPF interface from forming a neighborship with any potential neighbors is "passive-interface interface." When this command is applied to an OSPF-enabled interface, it tells the OSPF process to treat that interface as passive. This means that OSPF will not send hello packets out of that interface, nor will it listen for hello packets from other routers, thereby preventing the establishment of neighbor relationships.

This command is commonly used in scenarios where you want to limit OSPF to certain interfaces (for example, to prevent unnecessary neighbor formation on interfaces connected to end devices such as workstations or servers). It provides a control mechanism to optimize OSPF adjacency formation while still allowing the router to advertise its routes over that interface without establishing OSPF adjacencies.

Other commands listed do not serve the same purpose. The "no neighbor" command is not a recognized OSPF command for preventing neighborships; instead, it would be used in other routing protocols. "Disable-interface" is also not a valid command in Cisco IOS syntax, and "shut down" relates to administratively shutting down an interface, which is far more disruptive than simply making an OSPF interface passive.