A:Answer I'm sure you COULD connect this to a G5 monitor if you found a USBc to ADC converter, but by the time you do that, you are using a really old low quality monitor that probably won't look good or be comfortable to use with modern Mac OS. You would be better off finding a USBC to HDMI adapter and using it with a more modern monitor or TV, a plus side to that solution would be the 2nd part of your question. If you wish to use an ethernet wired connection there is no port for it on this computer, but they do have network ports on some of the USBc to HDMI adapters out there.