Option C is correct - Even though HSRP version 2 uses the new IP multicast address 224.0.0.102 to send hello packets instead of the multicast address of 224.0.0.2, used by HSRP version 1; when the HSRP version is changed, each group will reinitialize because it now has a new virtual MAC address.
Correct, from cisco directly; "When the HSRP version is changed, each group will reinitialize because it now has a new virtual MAC address.?"
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/xe-3s/fhp-xe-3s-book/fhp-hsrp-v2.html#:~:text=Version%201%20is%20the%20default,the%20multicast%20address%20of%20224.0.&text=HSRP%20version%202%20permits%20an,MAC%20address%20range%200000.0C9F.
HSRP version 1, virtual router’s MAC address is 0000.0c07.ACxx , where xx is the HSRP group.
HSRP version 2, virtual MAC address is 0000.0C9F.Fxxx, where xxx is the HSRP group.
Note: HSRP for IPv6, MAC address range from 0005.73A0.0000 through 0005.73A0.0FFF.
Ref: First Hop Redundancy Protocols Configuration Guide, Cisco IOS Release 15M&T
“…
Information About HSRP Version 2
HSRP Version 2 Design
…
When the HSRP version is changed, each group will reinitialize because it now has a new virtual MAC address.
…”
A. No changes occur because the standby router is upgraded before the active router.
Wrong answer.
B. No changes occur because version 1 and 2 use the same virtual MAC OUI.
Wrong answer.
C. Each HSRP group reinitializes because the virtual MAC address has changed.
Correct answer.
D. Each HSRP group reinitializes because the multicast address has changed.
Wrong answer.
Confirm that the correct option is C, following the next text:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/xe-3s/fhp-xe-3s-book/fhp-hsrp-v2.html
"When the HSRP version is changed, each group will reinitialize because it now has a new virtual MAC address."
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