...Do we need to know anything beyond reverse, forward bias configuration and their energy diagrams, as well as switch conditions for ON/OFF?
You need to know the concepts up to the end of the switch material in today's lecture. There may be a qualitative problem involving descriptive words and/or sketches, but you will not not to do calculations, since we have not had a homework problem on this material yet.
Small-signal models and AC equivalents will not be covered on the midterm.