Thanks for that! 
I did a quick scan through, less than a handful of posters seem to have any real data networking expertise. Among them, Simon-in-Suffolk seems to semi-plausible explanations; suggesting that any improvement might have to do with the analogue noise carried over the Ethernet cables from the Cisco switch to the Streamer/DAC. While technically possible, it’s very easily mitigated with a fibre-optic media converter, with a proper linear PSU at the streamer/DAC end. No need for any special Cisco switch.
Some of the other technical discussions revolve around Ethernet frames and broadcast traffic isolation in order to “reduce consequential processing noise” etc. But that betrays a fundamental lack of understanding of how modern Ethernet chipsets work - those from the handful of suppliers like of Broadcom, Marvell, Realtek etc. - extraneous Ethernet frames have ZERO impact on the end-point re-assembled data streams (audio or otherwise), they are discarded without prejudice.
As they say, a little knowledge can be a dangerous thing.
Pay attention to codacrome’s post though, he’s spot on 
If bits aren’t being changed, and analogue noise is taken care of, than would you care to elaborate what are some of these other factors in play? Give me examples please, or point me to a specific post by someone’s explaining what you believe. 
There are many reasons why the likes of Google and Apple use Ethernet switches from Cisco, Arista, Juniper, etc. Primary among them is the need for Data Center network scaling, and to meet the needs of top-of-rack spine-leaf architectural requirements. I can assure you none of the reasons are even remotely related to what the Audiophile community of late seem to be preoccupied with in respect to Ethernet switches.
Think about it for a moment, these Audiophiles are suggesting that Ethernet switches have a “day & night” impact on sonics when it comes to Audio streaming at home, but for all other applications in the world, these Ethernet switches work perfectly fine and can reproduce data perfectly without any such tweaks necessary.
How absurd is that??! Maybe they should check their bank accounts, their balance could be off since the Bank’s don’t use tweaked Ethernet switches 
By the way, for a good laugh, check out Uptone’s Whitepaper on the EtherRegen! Debunking each of the b.s technical points in the paper probably belongs in a separate thread. The paper is not only absurd, it’s downright hilarious. I wonder whether they genuinely believe the nonsense or they’re faking it just to make money.