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Ethernet speeds historically were measured in 10/100. In my past life I worked for an a small rural isp. And part of my learning I was taught that cat5 was 8 strands of wire, or 4 twisted pairs. I got very familiar with crimping patch cables. If one strand were cut a network card would negotiate down to its lowest speed and still work at 10mbps. Operating on 4 wire or two pairs. It’s possible with those numbers you had a bad connection, or a broken strand in the cable and it auto negotiated down to 10mbps. To this day I still crimp my own cables, and I own a cheap cable tester to make sure the crimps and cables are good.
Woah there. You’re using about 25% more of your brain than the rest of the internet. We’re gonna need you to tone that reasonability down a bit.
I look forward to setting up my next polyamorous network connection. I can wait for the commands nmcli con choke me daddy ens1 thrupple0