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To enable high availability across subnets, which mode must be enabled on the Citrix ADC?

SyncVLAN

Fail-safe mode

HA monitoring on all Interfaces

Independent Network Configuration (INC) mode

High availability across subnets requires the two Citrix ADCs to operate with independent network configurations while still participating in the same HA pair. Independent Network Configuration (INC) mode makes this possible by removing the requirement that both units share a single Layer 2 domain. With INC enabled, each ADC can reside in its own subnet (different NSIP/gateway settings) and still exchange HA state and coordinate failover, so the active device can hand off to the standby even across routed networks. This is why INC mode is the mode that enables cross-subnet HA.

The other features relate to synchronization or failover behavior but do not by themselves enable cross-subnet operation: a dedicated Sync VLAN helps with config synchronization paths, while HA monitoring on interfaces or a fail-safe setting affects detection or protective actions but not the fundamental cross-subnet HA capability.

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