Which command can leak routes of Level-2 areas into Level-1 areas?

The command that can leak routes of Level-2 areas into Level-1 areas is "import-route isis level-2 into level-1." This command is specific in its function to import routing information from Level-2 IS-IS areas into Level-1 areas. By utilizing this command, the router is directed to take the routes that are advertised within Level-2 areas and make them available in Level-1 areas.

This is particularly important in IS-IS routing environments where there are hierarchical divisions between different levels of areas, allowing for better route management and optimization of routing tables. The command ensures that necessary routes from one level can be shared and utilized at another level, improving the overall efficiency of routing within the network.

The precision of this command is crucial because using less specific commands may not achieve the desired outcome of route leakage and could result in routing conflicts or misinterpretations in the network hierarchy. The clear differentiation of commands in IS-IS ensures that network engineers can manage routes effectively between hierarchical levels.