Network audio relies on error free bulk data transfer. When the musical data is transferred from the source to the destination the data is broken up into thousands of small data packet/frames. Each chunk of data has an associated checksum. If timing or phase errors occur causing one or more bits to be received incorrectly the checksum will fail, the packet will be discarded and eventually re-transmitted. Once a packet/frame is received at the destination it will be copied and moved around in system memory multiple times. The data will eventually be reassembled in system memory and then the process of generating an analog signal will begin.
Some one on the internet ran an experiment where he/she wrapped an electrical cable around an Ethernet cable and measured a small 60 Hz signal coming out the DAC. When the electrical cable was removed the 60 Hz signal disappeared. Maybe some one here can reproduce that experiment.