In a source-based network, how does a trace interact with device terminals?

In a source-based network, the functioning of traces is specifically defined by how they navigate through the network's topology. In this case, the correct statement is that a trace cannot travel from upstream to non-upstream terminals. This is an essential aspect of the network’s logical behavior because upstream terminals typically represent points in the network where resources are generated or flow into the system, while non-upstream terminals may represent points where the flow is either terminated or diverted.

The restriction enforced on traces regarding upstream and non-upstream terminals ensures that the flow directionality and the integrity of resource distribution within the network are maintained. This directionality is crucial when analyzing the network since it helps in accurately modeling and interpreting the connectivity and relationships between network nodes.

The idea that a trace must always start from a terminal is a separate concept, as traces can begin from various points within a network depending on the operation. Similarly, while terminals might restrict how a trace can proceed through the network, the notion that traces are unrestricted by terminal pathways contradicts the fundamental flow principles of source-based networks. Understanding these constraints is fundamental for working effectively within utility networks and interpreting their operational designs.