Valid HSRP Virtual Mac Address

A

HSRP (Hot Standby Router Protocol) is a Cisco proprietary protocol that provides redundancy for IP networks by allowing two or more routers to share a virtual IP address. The routers work together to present the appearance of a single virtual router and provide a default gateway for hosts on a LAN.

In HSRP, the virtual router MAC address is used to represent the virtual IP address of the group. This MAC address is a unique value that identifies the virtual router on the LAN. The virtual MAC address for HSRP is 0000.0C07.ACxx, where xx is the HSRP group number in hexadecimal.

Now, let's look at the options given in the question:

A. 0000.0C07.AC15 This is a valid HSRP virtual MAC address. The xx value is 15, which is the HSRP group number in hexadecimal.

B. 0000.5E00.01A3 This is not a valid HSRP virtual MAC address. The first three bytes (0000.5E00) indicate a multicast MAC address, not a virtual MAC address for HSRP.

C. 0007.B400.AE01 This is not a valid HSRP virtual MAC address. The first two bytes (0007.B4) indicate an OUI (Organizationally Unique Identifier) assigned to a specific company, not a virtual MAC address for HSRP.

D. 0007.5E00.B301 This is not a valid HSRP virtual MAC address. The first three bytes (0007.5E00) indicate a multicast MAC address, not a virtual MAC address for HSRP.

Therefore, the only valid HSRP virtual MAC address among the options given is A. 0000.0C07.AC15.