Refer to the exhibit. Which action should be taken to ensure authentication if the RADIUS servers are unavailable?

An engineer must limit management access to the Cisco ACI fabric that originates from a single subnet where the NOC operates. Access should be limited to SSH and HTTPS only. Where should the policy be configured on the Cisco APIC to meet the requirements?

An organization has encountered many STP-related issues in the past due to failed hardware components. They are in the process of long-term migration to a newly deployed ACI fabric. Senior engineers are worried that spanning-tree loops in the existing network may be extended to the ACI fabric. Which feature must be enabled on the ACI leaf ports to protect the fabric from spanning-tree loops?

Which two components are essential parts of a Cisco ACI Virtual Machine Manager (VMM) domain policy configuration? (Choose two.)

Which endpoint learning operation is completed on the egress leaf switch when traffic is received from an L3Out?