@JonathanLee
That Mac network might have been AppleTalk. (Do Apple computers have Mac addresses? 😉 )
MTU is something that should be discussed, otherwise we'll be stuck with 1500 forever. 16 Mb token ring could go almost 18K bytes. I doubt most people even know why 1500 was picked for Ethernet. Back in those days, networks weren't reliable and collisions were expected. So it became a trade off between efficiency and retransmitting lost frames. It became locked in with early Ethernet NICs that were hardware limited and also when 802.3 was introduced and the Ethertype/Length field was used to determine whether it was an Ethernet II or 802.3 frame.
These days, with switches, collisions are history and networks are both much faster and more reliable, so the 1500 MTU has become a bottleneck. I have a cheap TP-Link switch that can handle 16K frames and 9K are often used in data centres, etc.. It's time to move on.
BTW, my first Ethernet experience was with DECNet over 10base5 "Thicknet" and I'm probably the only one here who has ever hand wired an Ethernet controller.