Most HDMI cables you'll use in a home theater or computer setup will just transfer audio and video, but there are ones that can also transmit Ethernet.
I have a Dell U2720Q monitor that accepts HDMI 2.0, DisplayPort 1.4 and USB-C. I use USB-C because the monitor acts as a hub for a range of peripherals (keyboard, mouse, webcam, speakers, etc.etc) and ...
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