Sfuller

Hi, Apologies if this has been covered but wonder if anyone can assist? I live in a newish build flat. I have a bedroom and living room which I believe is separated by a plasterboard wall. I want to install a couple of ethernet cables through the wall to the switch in the living room. It probably is a silly question but can you simply cut a hole either side of the wall and fit a faceplate. Is this a really bad way of doing it or not recommended for any rules or regulations? Regards, Simon