Which of the following defines a BACnet network?

A BACnet network is defined as a group of devices communicating through the BACnet protocol. BACnet, which stands for Building Automation and Control Network, is a communication protocol specifically designed for building automation and control systems. It facilitates communication among various devices such as HVAC equipment, lighting systems, access control, and fire detection systems, allowing them to work together seamlessly.

This definition highlights the protocol's emphasis on interoperability among diverse devices from different manufacturers, which is one of its key advantages. By focusing on the communication capabilities of the devices rather than the specific systems they control or the physical connections between computers, this answer encapsulates the purpose and function of a BACnet network effectively.