What is the criteria for a probe to be triggered?

A probe in ServiceNow Discovery is a tool used to gather information about various devices within a network. The successful triggering of a probe is contingent upon the presence of a classifier. Classifiers serve as the logical mapping between the probe and the devices that are being scanned. They define what type of information the probe will seek and how it will interact with the devices discovered.

The classifier is essential because it determines the discovery method and the data that will be collected. Without a classifier, the probe would lack the necessary parameters to correctly identify the devices and the specific data to be gathered, rendering it ineffective. This underlines the importance of having a classifier present for probes to operate successfully.

The other options address different aspects of ServiceNow Discovery but do not directly influence the initiation of a probe. User-defined permissions pertain to access control rather than the mechanics of triggering probes. System-predetermined criteria and manual approval processes are also not specifically related to the fundamental functionality that links probes and classifiers in the context of ServiceNow Discovery.