Is optical mostly a waste of time versus Ethernet?

@yyzsantabarbara oh wow. You are special! Can’t even admit you have no idea what your are talking about after your vendor of choice throws it in your face.

UDP is not broadcast. It is a stateless L3 protocol. And no, it is not just Roon. You still don’t get it, if you lose a packer when you send a compressed stream, you can’t uncompressed that part of the stream at all. In addition, DRM requires at least digitally signed music, so, the entire song must be received in its entirety for it to work for downloads, and larger chucks of the stream that is digitally signed. The only thing you have proven is that your really have no clue, which I don’t blame you for, it is infinite more complex than a speaker cable, except that you keep saying you know something about it, which you absolutely  do not.
 

from Wikipedia “ The Internet Protocol Version 4 (IPv4), which is the primary networking protocol in use today on the Internet and all networks connected to it, supports broadcast, but the broadcast domain is the broadcasting host's subnet, which is typically small; there is no way to do an Internet-wide broadcast. ”

but hey, you “program this stuff”. 
 

This thread has become a waste of time. There are some really good answers included here but some of the tangents really disappointing.

In summary it’s all about the noise passing through the ethernet cable and dealing with it. Network switches help by not adding noise, maybe canceling out some of it, and offer clocking benefits. Enough said

@jumia  No clocking benefits, if noise is entering your streamer/DAC through Ethernet, you have some serious other issues. 
 

so the take away is that you should not waste your money. Like I have pointed out and proven, the likes @sns ​​​​and @yyzsantabarbara have no clue about how networking works. 

A router and a switch are two different components of a network. The router is actually a computer that assigns the IP address to a Mac Address (network card) so that multiple MAC addresses can use the connection at the same time. The switch is a different component that reads the packets destination and sends them to the correct endpoint.

WIFI is a separate component that uses radio frequencies instead of hard wire to transmit and receive ethernet packets. As WIFI is now so prominent it’s built in but you can still purchase routers without WIFI.

https://www.amazon.com/MikroTik-Gigabit-Ethernet-Router-RB760iGS/dp/B07F7HDRKX/ref=sr_1_5?keywords=Non+Wireless+Router&qid=1660763397&sr=8-5

Routers can do a lot of cool things like separate groups of users to share / hide resources from each other for instance creating a departmental printer that can only be used by assigned users or limiting access to the payroll computer only to the payroll department.

Everyone should look at the routers admin pages to see what can be accomplished BUT DON’T MAKE CHANGES UNLESS YOU KNOW WHAT YOU ARE DOING AS IT’S EASY TO DOWN THE WHOLE NETWORK WITH A SINGLE SETTING!!!

So maybe a router that is Wi-Fi free should be used to connect all the audio stuff and you can then connect a router with a Wi-Fi daisychained to the first router, because everyone needs Wi-Fi.

Does this seem like a really good idea?

To me the Wi-Fi free router looks like a switch. Maybe connect an audiophile Grade switch directly to the modem and then connect a router to the switch for all those non-audiophile related item. And then connect all the audio equipment stuff to the first switch that is connected to the modem. Does this solve anything?

Of course excluding gear from a router may impair security concern issues.