As an electronics engineer, I do believe that noise on the Ethernet connection (really any connection to your audio equipment) could have an audible effect on the sound quality, but trying to fix this at the network switch seems misguided. You're just providing more opportunity for noise to creap back in between the network switch and your audio gear.
It seems to me that you are much better off investing the same effort (dollars) as close to the final conversion to analog as possible. The DAC and/or streamer is a much better place to eliminate noise from the network connection than the network switch.
It seems to me that you are much better off investing the same effort (dollars) as close to the final conversion to analog as possible. The DAC and/or streamer is a much better place to eliminate noise from the network connection than the network switch.