A Cisco FTD has two physical interfaces assigned to a BVI. Each interface is connected to a different VLAN on the same switch. Which firewall mode is the Cisco FTD set up to support?

Active/active failover is a high availability configuration for redundancy, not a primary firewall operating mode like routed or transparent.

In transparent mode, the FTD acts as a Layer 2 bridge; while BVIs are used, if the FTD is intended to handle traffic between different VLANs as a Layer 3 device (routing), it implies routed mode with the BVI providing L3 termination.

When a Cisco FTD has two physical interfaces assigned to a Bridge Virtual Interface (BVI), and each interface connects to a different VLAN, the FTD is configured for routed mode. In this setup, the BVI acts as a Layer 3 interface for the bridge group, allowing the FTD to route traffic between the different VLANs while performing security inspection.

High availability clustering is a feature for redundancy and scaling, not a primary firewall operating mode.