When I was a young lad learning networking (informallly in the late '80s and early '90s, and formally in the mid '90s), your could start from scratch and get a somewhat whole picture in a 12 week 2x90min sessions per week term.

Nowadays, It takes 2~3 14 week terms to work through the full stack. And, to top it off, many lazy professors (the older the more common this behaviour, perhaps us a burden to make new powerpoints) dedicate ample swathes of time to dead-wood topics (like 10base2 Eth and the intricacies of the crossover cable), and little to no time to modern topics (like 2.5Gbps and up Eth and the intriciacies of the 64b-66b cookbook of some 10Gbps (and up) Eth). I saw (and heard) this with my own eyes (and ears) when I was teaching networks at undergrad level between 2009~2016.

I've always advocated for a scheme in which you dedicate the first part of the first term by runnig up the stack fast by analyzing only a few SIMPLE components in each layer (say, 802.11b + IPv4 + RIPv2 + UDP + Some apps that use UDP), so that the students get a picture of a whole stack as fast as possible, and the reminder of the 2 + Chage terms to go through the model layer by layer (application to phy like cisco or phy to application like classic, does not matter)...

And to drop all the dead wood.