By default, which virtual MAC address does HSRP group 25 use?
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Correct answer: 00:00:0c:07:ac:19.
Why this is the answer
HSRP (Hot Standby Router Protocol) uses a specific virtual MAC address format: 00:00:0C:07:AC:XX, where XX is the HSRP group number in hexadecimal. For HSRP group 25, the hexadecimal equivalent of 25 is 19. Therefore, the virtual MAC address for HSRP group 25 is 00:00:0C:07:AC:19. The other options do not follow the standard HSRP virtual MAC address format or use incorrect hexadecimal conversions for the group number.
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