Refer to the exhibit.
Which action should be taken to ensure authentication if the RADIUS servers are unavailable?
Which description regarding the initial APIC cluster discovery process is true?

Refer to the exhibit. Which action should be taken to ensure authentication if the RADIUS servers are unavailable?
An administrator must migrate the vSphere Management VMkernel of all ESXi hosts in the production cluster from the standard default virtual switch to a VDS that is integrated with APIC in a VMM domain. Which action must be completed in this scenario?
Which attribute should be configured for each user to enable RADIUS for external authentication in Cisco ACI?