I've always believed that you need to teach your students (more so if they are engineers) how things work, so they'll be able to understand why they do things they way they do them. It seems to me, though, that the training courses I'm seeing veer ever more toward overviews and recipes ... but there are a few things you can do on your own.
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.