Company X has a primary and a backup Cisco Unified Communications Manager instance. The administrator had to do maintenance on the primary node and did a shutdown, which resulted in a failover to the backup node.
What happens when the primary node comes back online?
A. The primary node becomes the backup node.
B. Endpoints detect that the primary is back and reregisters automatically.
C. The backup node must be shut down first to allow the endpoints to realize that the primary node is online again.
D. Nothing, the endpoints only failover when the node they lose connection to their registered node.
When a failed primary Cisco Unified Communications Manager comes back into service, it takes control of the group again, and the devices in that group automatically reregister with the primary Cisco Unified Communications Manager
B see page 2
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmsys/CUCM_BK_SE5FCFB6_00_cucm-system-guide-100/CUCM_BK_SE5FCFB6_00_cucm-system-guide-100_chapter_0111.pdf
Answer is B. Questions says “which resulted in a failover to the backup node.” So the Endpoints detect that the primary is back and reregisters automatically
Inaccurate. The answer here is D