An network engineer is configuring HSRP group 15 on a Cisco router interface that has been assigned the primary IPv4 address . Which requirement must be met when defining the HSRP virtual IPv4 address for this interface?
- The virtual IPv4 address must belong to the subnet and cannot match the physical IPv4 address of any router in the group.Answer
- BThe virtual IPv4 address must match the physical IPv4 address assigned to the active router interface.
- CThe virtual IPv4 address must be assigned from a distinct IPv4 subnet that is separate from the physical subnet of the interface.
- DThe virtual IPv4 address can be set to any valid host IPv4 address because HSRP relies exclusively on MAC address translation.
Answer
The HSRP virtual IPv4 address must be in the same IPv4 subnet as the interface's physical IP address (), but it cannot be identical to the physical IPv4 address configured on any router participating in the HSRP group.
In HSRP (v1 and v2), the virtual IP address configured via the command `standby <group> ip <ip-address>` must reside within the same IP subnet as the router interface's physical IP address so local LAN clients can reach it as their default gateway. However, Cisco IOS explicitly blocks assigning a virtual IP address that matches any physical IP assigned to a router interface in the group.
Step-by-Step Solution
Key Concept
HSRP Virtual IP Address Assignment Requirements