In that era you had to load the network drivers before windows, it was all DOS based. It wasn't until windows for workgroups that windows based networking was a thing.

Netware, I also worked with Microsoft's SMB and a few other lesser known things. 3Com something or other. There were some interesting network types around then too - unfortunately alot of coax networks (a disconnected cable would bring the whole network down), Banyan Vines, some IBM token ring which had some weird cables and connectors. Cat 5 networking came in not long after.

Back then there were all sorts of protocols flying over the network. IPX/SPX, XNS mainly. The one protocol NOT present on our systems was TCP/IP.