In which scenarios would an HSRP router become active while also detecting a duplicate IP address?
A) HSRP version mismatch
B) ACL blocking HSRP packets
C) Routers configured with different virtual IPs
D) HSRP group number mismatch
A, D
Explanation: A) When HSRP routers have mismatching versions or group numbers, they will ignore each other's HSRP communications, but they will detect a duplicate IP address being used by the other router. When these communications are blocked from each other, they would not detect each other at all, including any IP conflict. If the devices are configured with different virtual IP addresses, there wouldn't be a conflict, so it wouldn't be detected.
D) When HSRP routers have mismatching versions or group numbers, they will ignore each other's HSRP communications, but they will detect a duplicate IP address being used by the other router. When these communications are blocked from each other, they would not detect each other at all, including any IP conflict. If the devices are configured with different virtual IP addresses, there wouldn't be a conflict, so it wouldn't be detected.
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