Absolute Free H12-821_V1.0 Exam Practice for Comprehensive Preparation 

When preemption is enabled, a backup device preempts the master role if it has a higher priority than the current master.

When preemption is disabled, a backup device does not preempt the master role even if it has a higher priority than the current master, provided that the current master is working properly.

The master periodically sends VRRP Advertisement packets in the VRRP group to advertise its configurations such as the priority. 

Even if the VRRP device is the IP address owner, it still needs to participate in the election and does not directly transition to the Master state when receiving a message indicating that the interface goes Up.

OSPF does not have an acknowledgement mechanism. Therefore, OSPF relies on the upper-layer protocol, TCP, for acknowledgement.