The young'uns today spoiled with their Ethernet and TCP/IP! I have this T-Shirt (this is the one at the CHM), but it reminds me what internetworking was all about in the 90's. I remember listenening to the clicks in the Token Ring MSAU's and learning all about DEC LAT at 0200 on a Friday morning while in the SBC office in London...
https://www.computerhistory.org/revolution/networking/19/376...