Figure 4
From: Motivating students’ participation in a computer networks course by means of magic, drama and games
Shots taken during the dramatic presentations of computer network protocols. (a) Token Ring: messages are transmitted over the ring (wire) while the token (student on the left) holds an alarm-clock to keep the token holding time, (b) Acknowledgements arrive at transmitter’s site and packets (numbered boxes on the desk) wait for their turn during a presentation of the Go-Back-N protocol.