In the MAC address 0000.0c07.ac03, what does the “03” represent?
A.
HSRP router number 3
B.
Type of encapsulation
C.
HSRP group number
D.
VRRP group number
E.
GLBP group number
Explanation:
Each router keeps a unique MAC address for its interface. This MAC address is always associated
with the unique IP address configured on the interface. For the virtual router address, HSRP
defines a special MAC address of the form 0000.0c07.acxx, where xx represents the HSRP group
number as a two-digit hex value. For example, HSRP Group 1 appears as 0000.0c07.ac01, HSRP
Group 16 appears as 0000.0c07.ac10.
Reference: Cisco Hot Standby Router Protocol (HSRP)
(http://tools.ietf.org/html/rfc2281#page-13)