We just did this one. It is probably a better exercise in person. You can hand out strings and then walk around with a pair of scissors to test their designs for fault tolerance.
In person you could even extend the concept with monopoly money and have them pay for string segments to get that cost concept.
One of our groups created a network with an extra node by just joining all the line segments together. So we did see some confusion. But that is a general problem with any metaphor you might come up with and try to implement in digital form.