What does the term Master Node refer to In the Avaya Surge™ lot Controller deployment model?

Which Avaya Surge™ Administration user interface sub interface can be used to perform the software upgrades for ONA and HyperSec Gateway?

To monitor Avaya Surge™ IoT Controller, which Avaya Surge™ IoT Controller port is used to communicate between ONA and ODL?

When administrators deploy the Avaya Surge™ IoT solution using a single VSP switch, if ONAs are connecting to VSP, in which mode do you need to configure the VSP switch ports?

A customer is using an end-to-end Avaya Fabric Connect network solution for Surge IoT implementation.
Which Avaya technology is most useful for IoT deployment automation at the Access Layer?