How is the Spanning Tree Protocol defined in terms of network paths?

The Spanning Tree Protocol (STP) is designed to create a loop-free network topology by defining a single active path between each pair of devices in a network. This is crucial in Ethernet networks, where multiple switch connections can lead to loops, potentially resulting in broadcast storms and network outages. By identifying and blocking redundant paths, STP ensures that there is one designated active path for data to travel between devices, which maintains network stability and efficiency.

While STP can technically recommend alternative paths in case the active path fails, it does not support multiple simultaneous paths between devices as a means of normal operation. This characteristic is fundamental as it directly addresses the issue of network loops, ensuring that there is organized traffic flow without causing any disruptions across the network.