What command is used to fill the network map to all connected clusters and MSUs?

The command used to fill the network map to all connected clusters and Managed Service Units (MSUs) is the command found in the first choice provided. This command effectively updates the network information and ensures that all clusters and MSUs are accounted for in the network map.

When you use this command, it initiates a process that gathers data from all connected components within the network, ensuring comprehensive mapping of the system. This is especially important in a tactical environment where understanding the layout and status of all interconnected elements can significantly affect operational efficiency and responsiveness.

The other options represent different commands or functionalities that do not specifically address the need for filling or updating the network map across connected clusters and MSUs. Each of those commands serves its own purpose but does not achieve the intended mapping of the entire network as effectively as the first command. Thus, the first command stands out as the correct choice for this particular operation within the Tactical Session Controller framework.