In Apple's Network framework, one of the nw_path_status_t enum values is nw_path_status_satisfiable:
The path is not currently available, but establishing a new connection may activate the path.
What exactly does this mean? At first, I thought it represented the case where Wi-Fi is enabled but not connected to any network. However, after disconnecting from my Wi-Fi network (but leaving Wi-Fi enabled) and running my program, the status was revealed to be nw_path_status_unsatisfied.