How can one identify the high-output port of an unbalanced 3-way splitter when studying a network map?

Identifying the high-output port of an unbalanced 3-way splitter on a network map is typically indicated by a specific mark or symbol that conveys its functionality. The correct choice emphasizes that a dot on the map symbol serves as the indicator for the high-output port. This means that within the design of the network map, distinct visual cues are used to represent various components and their functions, facilitating easier identification for those studying or analyzing the network.

Options that suggest alternative methods of identification, like a colored dot or size of the symbol, may not consistently apply across different maps or systems, which could lead to confusion. Additionally, labeling could provide direct information, but relying solely on that without considering the symbolic representation could miss the standardized method often used in engineering designs. Thus, the presence of a dot on the specific symbol is the recognized and most accurate method to identify this particular port.