I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Network hardware, software and specifications, as well as the expertise of network management personnel are important in ensuring that data follows the most efficient route, and upstream connections work reliably. A tradeoff between cost and efficiency is possible.[citation needed]"? 

What factor in data flow would ultimately be the decision maker for how to balance cost and efficiency?