This isn't a straw-man (or at least wasn't when I took an undergraduate networking class in 2003 at Purdue[1]). We were taught the mappings from the OSI model

This isn't a straw-man (or at least wasn't when I took an undergraduate networking class in 2003 at Purdue[1]). We were taught the mappings from the OSI model to Ethernet/IP pretty much like TFA says, along with some hand-waving for the top 3 models with too many holes for the professor to address whenever anyone raised questions about it. 1: It was an off semester and it wasn't taught by Doug Comer, but we did use his book.