Somewhere on any given topic:

• I don't know that I don't know (ignorance).
• I know that I don't know (awareness of the existence of knowledge).
• I know that I know (active obtained knowledge).
• I don't know that I know (knowledge now part of the unconscious toolbox).

If I give you a crumb, realize that I may just be in a rush or don't know how to answer it properly.