Ethernet cables


So I've been streaming for just over a year (I'm really an analog guy, listen about 75% to my TT set-up). Been listening to Roon/QoBuz via my MacBook Pro thru a Bricasti. The Bricasti is hooked-up via a Ethernet cable to an Xfinity "POD"  which works well. Yesterday got in a Roon Nucleus and what a great sonic improvement! Very happy. But here's the question. I'm using a very good Ethernet cable from the Bricasti to POD but how important is the Ethernet cable from the Nucleus to the switch? Personally I haven't done much comparisons with Ethernet cables. 
(Dealer disclaimer) 
sksos
Check Network Acoustic. I have the Eno system and the result are phenomenal.....everything more natural.....top
Hi sksos: I found this review article helpful  http://www.audiodrom.net/en/special-edition-reviews/104-ethernet-rj-45-cables-shootout  In the conclusion section they determined that the cable from the modem to router wasn't important. I had a combination of Supra Cat8 and SOTM Cat7 in my system. I recently replaced the Supras with the Viablue cables. https://tritonaudiocables.com/Digital-Cables_c_23.html  They are a bit more money, but they are a definite upgrade in sound quality from the Supras (better frequency extension and the highs really sparkle without edginess). The SOTMs are for sure the best, but at a price. Good listening. Jeff
Hi yoby, I have the same via blue cable from my router to the SotM switch se with master clock inside. But from the switch I can only strongly recommend the ENO system from network Acoustic !!!!!
I also saw a big difference when you put a linear power supply to your router/modem.
I'm about to pull the trigger on a  Bricasti M3 with their optional Network Interface. 
I have concerns about a difficult ethernet cable installation from the white Xfinity xFi Router/Modem located in another room after reading this FAQ.   

https://www.bricasti.com/en/consumer/network.php

I have an xFi Pod with the two ethernet jacks but isn't that ultimately still a WiFi connection?

Not very digital source savvy from over ten years with just a Mac Mini WiFi to a Squeezebox Touch and a Metrum NOS Mini.

M