Network Discovery is a feature of SolarWinds NPM that allows you to automatically discover and add network devices to the Orion Platform for monitoring. You can use Network Discovery to query Domain Controllers in your company domain and then select the Organizational Units (OUs) with the registered devices you want to scan. This way, you can add entities from NPM to monitor for all registered devices in your company domain in a single discovery. The other options are not as efficient or accurate as Network Discovery, as they either require manual addition of each device, or rely on the Domain Controllers to provide the list of registered devices, which may not be up-to-date or complete. References:
Discover your network devices and add them to the Orion Platform
Discover devices on your network using Active Directory