Quality Control for a projector is lamps and lenses and knowing how to keep the management system working.
Quality Control for a network is knowing how people will break into it, and knowing where it will break. So in that regard we need to know things in the same manner as a plumber knows what goes on in the pipes.
Wireshark does some of that. Being able to break into the system does some of that. Because if you can, someone who smells a perfect digital print worth millions certainly will be able to.
Good luck.
