When APIC is down on cluster device … What is the minimum number of APICs requirement for a production ACI Fabric to continue to operate?

A.
1

B.
2

C.
3

D.
4

Explanation:
The Cisco Application Policy Infrastructure Controller (Cisco APIC) is the unifying point of automation and management for the Application Centric Infrastructure
(ACI) fabric. The Cisco APIC provides centralized access to all fabric information, optimizes the application lifecycle for scale and performance, and supports flexible
application provisioning across physical and virtual resources.
The Appliance Director is responsible for formation and control of the Cisco APIC appliance cluster. A minimum of three controllers are initially installed for
control of the scale-out Cisco ACI (Figure 9). The ultimate size of the Cisco APIC cluster is directly proportionate to the Cisco ACI size and is driven by the
transaction rate requirements. Any controller in the cluster is able to service any user for any operation, and a controller can be seamlessly added to or removed
from the Cisco APIC cluster. It is important to understand that unlike an OpenFlow controller, none of the Cisco APIC controllers are ever in the data path.