What occurs when HSRP is changed from version 1 to version 2?
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Correct answer: Each HSRP group reinitializes because the virtual MAC address has changed..
Why this is the answer
When HSRP is changed from version 1 to version 2, each HSRP group reinitializes because the virtual MAC address format changes. HSRPv1 uses a virtual MAC address in the format 0000.0C07.ACxx, where xx is the group number. HSRPv2 uses the format 0000.0C9F.Fxxx, where xxx is the group number. This difference in MAC address format forces a reinitialization as devices on the network will need to learn the new virtual MAC. The statement about the standby router being upgraded first is irrelevant to the technical change. While the multicast address does change (from 224.0.0.2 to 224.0.0.102), the primary reason for reinitialization is the virtual MAC address change, which directly impacts Layer 2 forwarding.
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