Hi All, I did this lesson AND the "How Routers Learn" optional lesson.
My students have been moving through the lessons pretty fast (or I haven't been providing enough time for discussion... one of the two). Last year when I did this lesson it got a little goofy with students writing bizzare things (to inappropriate things) in the traffic. I am fine with a little silliness, but learning stopped so this year I combined the two lessons and it worked really well. We were still talking about routers and redundancy, but it gave students something new to do.
Students commented "this is the most fun class" #TeacherWin
Also, a little sad that more classes can't be that fun... but I'll take it!