I don't see where the "trick question" comment might come from. As a guitar player you're supposed to be able to play using the whole fretboard, it makes you a complete guitarist. The position of the fretboard is tied to you ability to create certain licks..... for example my brain functions differently when I'm playing from the 12th fret upwards.... don't know why but it does.
So my question was simple. Pay attention to your playing and you'll noticed right away if you have a tendency to "box yourself" into a certain part of the fretboar.
I already explained the string question.