CCNA (200-301) Exam Practice Questions

HSRP MAC address

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Q18. A virtual router in HSRP has which of the following MAC address?

A. 00.00.0c.07.ac.1e

B. 00.00.0c.77.ac.1e

C. 00.00.0c.07.ad.1e

D. 00.00.0c.17.ac.1e

Correct Answer: A

Explanation:

In HSRP, the MAC address used by virtual router is made up of the following three components:
1. Vendor ID: The first three bytes of the MAC address correspond to the vendor ID.
2. HSRP ID: The next two bytes of the MAC address correspond to HSRP code. It is always 07.ac. Therefore, the virtual router MAC address will have 07.ac in the fourth and fifth bytes.
3. Group ID: The last byte of the MAC address is the group's identification number.
In the choices given, only 00.00.07.0c.ac.1e has 4th and 5th bytes 07.0c and hence a valid HSRP MAC address.

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