Then it’s not standard compliant. I would stick with standard compliant cables to avoid surprises or performance degradation.
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Indeed. Before going to SFP/fiber with the Cisco switch and 2021 Klimax support, I was using standard CAT6 patch cables.
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Yes, but readily available (at least in the US) refurbished, at the link I shared earlier and elsewhere. I know Linn recommends the GS105, it works reliably, but what I described sounds a bit better, at least with the 2021 Klimax streamers I own.
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I also have a Linn Klimax DSM/3, and I am using Cisco WS-C2960G-8TC-L Catalyst 2960 8-Port 10/100/1000 Ethernet Switch with optical ethernet out. However, this Cisco switch also works great with copper ethernet, it has a very good built-in power supply.
For cable, I recommend Blue Jeans CAT 6A.
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@QuinnT - Is the “Cat 6a Patch Cords–BJC C6AP - Bonded Pairs, Cat 6a, 500 MHz; Rated CMR for installation” a CAT6a U/UTP cable?
THX 
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Per Blue Jeans:
The Cat 6 is not shielded. The 6A is a special case: it has an absorptive shield for minimizing alien crosstalk. In this type of shield configuration, the shield is not grounded at the plug ends – rather, noise currents in it attenuate and cancel in the shield itself rather than being shunted to ground. So the 6A appears unshielded from the outside – it has unshielded plugs at each end – but it does have this unusual type of shielding underneath the jacket.
So in short maybe you want CAT 6 (as opposed to CAT 6A).
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This is something I wish I realized much ealier. Switched to unshielded CAT6 UPT cables almost a year ago and my network streamer sounds a lot better since then. Shielded cables are a no go for audio applications.
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@iliketohideincloset - THX Some thing like this:
So " Cat 6 Patch Cords–BJC C6P" would be better?
I just got a cheap 5,- EUR 5m CAT6 UTP off of Amazon.
If one (or both) RJ-45 socket is plastic/isolated all this talk about screened or not patch cables is irrelevant.
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„Better“? Better for what? These special cables are made for very specific applications.
Per @mikeb said.
By the way - I did ask Blue Jeans what they would recommended = CAT6
Thanks for all your great comments. I will try CAT6 from Blue Jeans.
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If you get the chance of lending an Audioquest Vodka Ethernet cable - give it a try and see the difference you hear.
Not cheap - 599 € 1.5 Meter 
And CAT7.
Do you use it between your Roon Core and DAC?
I would advise against it, personally I think these kind of cables are some kind of snake oil, but this is only my personal opinion. Others think otherwise.
Sometimes, psychoacoustics can play a significant role on how we hear and listen.
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This has the shield not grounded at the plug ends so not connecting grounds of both devices.
Yes use it in the most important spot which is streamer and DAC.
@QuinnT So you did listen/compare to the Vodka cable?!
Been there, done that (including the ER), not sounding better, maybe worse.
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Then you are one of the rare lucky users in the HiFi world who get their satisfied output from standard / cheap components.