That's a pretty good way to teach a concept like that. Take me for example, who fails at networking more than anybody Even I could follow the Bond example. Whoever wrote that is rather good at teaching and explaining things. Makes even the most complicated concepts (well, not that the 7 layer concept is probably complicated compared to some other things) and breaks them down in an easy to understand manner. Kinda like the book "The Elegant Universe", which makes superstring theory (Read: WTF Crazy Complex) understandable to someone who's only had the most basic scientific education.