What command provides operational status of the system?

The command that provides the operational status of the system is "show system status." This command is designed to give real-time information about the system's current state, including key parameters such as CPU utilization, memory usage, and the health of the various components within the device. By using this command, network engineers can effectively monitor system performance and identify any potential issues that may affect network operation.

In contrast, the other commands may serve different purposes. For instance, "show version" typically displays the version of the Junos operating system and details about the hardware, rather than the operational status. "display system health" is not a standard command in the Junos OS, and "check system performance" is also not a recognized command within the Junos command-line interface. Therefore, focusing on the specific command that delivers the operational status ensures that users can obtain the relevant information needed for effective network management and troubleshooting.