What action must be taken to configure a new identity source in Cisco ISE?

To configure a new identity source in Cisco Identity Services Engine (ISE), the correct action is to add a new identity source through the graphical user interface (GUI). This approach allows for a structured and user-friendly method to input the necessary information required for the identity source.

When configuring identity sources, such as Active Directory, LDAP, or other databases, using the GUI enables administrators to guide themselves through a series of prompts and fields. This facilitates the entry of critical details such as the source's name, type, connection parameters, and authentication settings without needing advanced scripting knowledge or external assistance. Moreover, the GUI provides real-time validation of inputs, helping to reduce configuration errors.

In contrast, the other options do not effectively address the typical processes involved in setting up identity sources. Importing existing identity sources might be useful for migration scenarios but does not apply to creating a new source. Running a command script would not be a standard practice for this specific task, as it detracts from the intuitive management capabilities the GUI offers. Lastly, contacting Cisco support is unnecessary for this process as the GUI provides all the tools required for configuration directly to the administrators.