In Cisco ACI, a single firewall or two firewalls deployed as an HA pair are configured as a ________.

In Cisco ACI (Application Centric Infrastructure), when a single firewall or two firewalls deployed as a high-availability (HA) pair are configured as a Device Cluster, it allows for seamless integration and management of these firewall devices within the ACI fabric.

A Device Cluster in ACI acts as a logical grouping of network devices, enabling them to work together cooperatively while presenting themselves as a single logical entity to the ACI fabric. This is beneficial for consistency and reliability, especially in HA configurations, where one firewall can take over in case the other fails, thus ensuring continuous protection and support for applications.

The concept of a Device Cluster is critical in simplifying the management of multiple firewalls and allows for features such as load balancing, failover, and redundancy, which enhances security and availability for the deployed services. It streamlines the way in which services such as firewalls are deployed and utilized in the overall ACI architecture.

Other options do not convey the same meaning in the context of Cisco ACI firewalls and their configurations. For instance, a Dataflow refers to the movement of data through the network, a Service Graph denotes the logical representation of the network services and their connectivity, and a Device Package is typically used for the packaging