What command applies a distribute list specifically to OSPF?

The command that specifically applies a distribute list to OSPF is "distribute-list 1 out." This command is used to control the distribution of routing information in OSPF by filtering the routes that the OSPF process advertises to its neighboring routers.

When you apply a distribute list in this context, the number "1" refers to an access list number or a prefix list identifier that has been defined elsewhere in the configuration. By using "out," the command specifies that the filtering should apply to the routes being sent out of the router to its OSPF neighbors. This functionality is crucial for managing which routes are advertised, helping to ensure that only relevant or desired routes are shared with neighboring routers, thus controlling the routing table size and preserving bandwidth.

In contrast, the other options do not appropriately fit the context of OSPF. For instance, using "network distribute-list 1 in" is not a valid command syntax for OSPF; OSPF does not use the "network" keyword in this manner. The third option, "distribute-list prefix-list," lacks the necessary context such as "in" or "out" to define the direction, making it incomplete for the specific application in OSPF. Lastly