I was reading through the first chapter and looked at the practice questions and came across this:
For each of the following pieces of information, give a reason why a network infrastructure blueprint would contain that information:
...
2. Cable Color
ANSWER: For a network using an external cable installation, matching the cable color to the wall color can help make the cables less visible.
Personally, I would have picked something along the lines of different cable color representing different segments of the network (backbone, WAN, LAN)... But that's just me...