What is the role of the virtual IP address in first-hop redundancy protocols?

• A. It is the actual device's IP address.
• B. It is a shared address used by hosts as their default gateway.
• C. It is a broadcast address for ARP.
• D. It is used for management only.

Answer: (B)

First-hop redundancy protocols provide a single, shared virtual IP address that acts as the default gateway for hosts on the subnet. Each router in the group has its own physical IP, but the virtual IP is the gateway IP that hosts configure as their default route. The routers coordinate so that one device currently owns the virtual IP and responds to ARP for it, effectively forwarding traffic. If the active device fails, another router in the group takes over the virtual IP and its associated MAC, so hosts continue to send to the same gateway IP without any change in configuration. This makes the gateway highly available and seamless for end hosts.

The virtual IP isn’t the actual device’s own IP, it isn’t a broadcast ARP address, and it isn’t limited to management traffic—it's the shared gateway address that keeps user traffic flowing when a router fails.