What does the command 'diagnose test application ipsmonitor 99' do?

The command 'diagnose test application ipsmonitor 99' is specifically designed to control the operation of the Intrusion Prevention System (IPS) on Fortinet devices. When this command is executed, it effectively restarts all IP engines and monitors. This is crucial when you want to apply changes made to the IPS configuration or when you're troubleshooting and need to reset the state of the IPS components.

When the command is run, the implementation typically involves clearing any existing monitors and processes related to the IPS engines, starting them fresh. This can help in cases where the IPS may not be functioning correctly, or when modifications have been made and you need to ensure they are applied successfully.

Understanding this command is essential for managing and maintaining IPS functionality within a Fortinet environment, making it a valuable tool for network security administrators. This emphasizes the operational and procedural aspect of managing intrusion prevention rather than merely viewing or altering configurations, which is captured in the correct choice.