Which interface does an IPS sensor use to communicate with a security appliance for management purposes?

Management interface is a generic term, but in IPS architecture the specific interface used for communicating with a security appliance is technically called the command and control interface.

User interface refers to the graphical or command-line interface presented to a human operator, not a network interface used for device-to-device management communication.

The command and control interface is the dedicated interface on an IPS sensor used for out-of-band management communication with the security appliance or management station. This interface handles configuration commands, policy updates, and administrative traffic, keeping management traffic completely separate from inspected network traffic.

The monitoring interface (also called the sensing or promiscuous interface) is used to passively capture and inspect network traffic, not to send management data to a security appliance.