Network + Study Notes: Open System Interconnection (OSI) Network Model
Computers have a very particular way of communicating with each other. For example, before widespread computer networks and the internet, people shared files by “sneakernet”: wearing a comfortable pair of sneakers and putting the info on the storage media and travelling to the destination computer to copy the data. This is not a very effective way to share files, and large companies soon realised this was a huge market and started developing various network protocols. The problem was that many of these protocols were proprietary and incompatible with each other. ...