To enable high availability across separate subnets, which setting is required?

To enable high availability across separate subnets, which setting is required?

• A. Configure SyncVLAN
• B. Turn on fail-safe mode.
• C. Turn on HA monitoring on all Interfaces
• D. Turn on Independent Network Configuration (INC) mode.

Answer: (D)

When you need high availability across separate subnets, you must configure Independent Network Configuration mode. This setting allows the two HA units to operate with separate networks and routing between them, so heartbeat and failover communications can occur even when the devices aren’t on the same Layer 2 network. INC mode effectively decouples the HA network paths from a single shared subnet, enabling reliable failover across multiple subnets. Other options address different aspects—such as keeping config synchronized on a shared VLAN or monitoring interfaces for failures—but they don’t enable cross-subnet HA by themselves.

When you need high availability across separate subnets, you must configure Independent Network Configuration mode. This setting allows the two HA units to operate with separate networks and routing between them, so heartbeat and failover communications can occur even when the devices aren’t on the same Layer 2 network. INC mode effectively decouples the HA network paths from a single shared subnet, enabling reliable failover across multiple subnets. Other options address different aspects—such as keeping config synchronized on a shared VLAN or monitoring interfaces for failures—but they don’t enable cross-subnet HA by themselves.