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Beginner

HSRP Question

Hi guys,


I am doing practice questions to make sure what i have learnt is enough for my ccnp switch exam, and i may be wrong in this one.

But from what i learnt in HSRP v1, that the the last 2 hexi decimal is the HSRP group
And in one of the questions it mentions:

 

"Which virtual MAC address does HSRP group 37 USE with default configuration?
A. 00:00:c:07ac:25
B. 00:00:c:07ac:37
C. 00:00:c:37:00:00
D. 00:00:c:25:00:00
Answer: A"


Now i am confused as to why the answer is A and not B.
Please advise 


Thanks

 

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3 REPLIES 3
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Advocate

Re: HSRP Question

Hi AFO99,

The mac address numbers are in hex. But HSRP groups are defined in Decimal.

so Decimal HSRP group 37 = 25Hex

37/16 = 2R5 = 25Hex.

"A" is correct

Regards, Alex. Please rate useful posts.
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Beginner

Re: HSRP Question

hi afo99,

As you know that HSRP uses this virtual MAC address, 0000.0C07.ACxy, where xy is the HSRP group number in hexadecimal.

so your HSRP group no is 37 which is in a decimal format so we need to change it into hexadecimal

37 = 0010 0101 binary

0010 0101 = 25 hex

so by this process, for HSRP Group 37 the  Mac address will be : 00:00:c:07ac:25

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Beginner

Re: HSRP Question

 
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