I recently checked my home network and noticed that one socket I had was accidentaly set up so it made a cross connection (with pins 3-1 and 2-6) being crossed.
I fixed my mistake but my network also worked fine before doing that. My Setup is basically
Router → Wall Socket (which was cross wired) → Switch -> PC
and before that
Router → Wall Socket → PC
Both configurations worked fine with the wall socket being wired regular or crossed. Now I'm curious why this wrong wiring did not cause any problems?