[pdimitar]

Have in mind that newer HDMI cables also allow Ethernet through them. Make sure to get no more than 1.4 (or 1.3, can't remember now) if you want your HDMI-connected device to never request (and get) internet from the host (which is often a PC).

[0xcde4c3db]

That would require support on both HDMI ports (it's a negotiated protocol, not something that can just be passively wired), and I've never heard of any mass-market hardware that actually supports Ethernet over HDMI, despite actively searching for it on multiple occasions. Discrete graphics cards on PC don't even support CEC, which would actually be useful for some people.

[cesarb]

The HDMI standard has it (and the cable generation shouldn't matter, as long as it has all pins connected), but does anything actually implement that Ethernet channel?

[0xcde4c3db]

The pair used by Ethernet was optional until it was repurposed for eARC (high-bandwidth audio backhaul to a receiver/soundbar). Early-version HDMI cables were available in both "with Ethernet" and "without Ethernet" flavors.