Here's a good summary of reference what networking and application models are, and what are examples of them at each of OSI layers.    

This is a next article in series about OSI layer 1 - in previous articles we looked  at Introduction to OSI Layer 1, then

Back in the day for Layer1, there were 10Base-2 (Thinnet) and 10BaseT (Thicknet). These types of layer one technologies used coaxial cable on shared bus systems. Really - just to repeat the layer one

This article is a next logical in a series of our Networking 101 article series, and we still continue discuss OSI Layers - without this, you can't really get into more complicate topics.