The "behaviour performance map" (figg. 3-4) is something (a performance indicator?) that deals with training students in cybersecurity; what exactly is it?

As far as I understand, the concept of Mobile Target Defense is a cornerstone of the work; at the same time, it is not completely cleared (or, possibly, it is referred to a preparatory technical background). The question aims exactly to a clarification of such key-concept.

As far as I could understand, the concept of "optimization" is used in a peculiar way in the paper. The optimization of the "finite numbers" recorded online unbeknownst to final users appears to be something negative but the reason of it is not clear as well as the peculiar meaning of "optimization" in such sense.