Audio is transmitted via a protocol called UPNP. This is different from the TCP/IP protocol which makes use of a type of error correction that can make up for data loss by interpolation. UPNP data, once lost, is lost. It can be heard as dropouts, and jitter. It is important to have a high quality router, switches power supplies, and ethernet cables to reduce the chances of lost data as well as maintain accurate timing of the data packets. That is what makes ethernet cables important if you are streaming your audio.