Using the OSI Model as a Troubleshooting Model

By Russell Lindsay, VP of Engineering, Trusted Network Solutions

One of the first things we learn when we started working in the field of computer networking, is the OSI model.  The OSI model is used to describe how data should pass across a network.  It is broken up into 7 layers, starting with layer 1 as the lowest layer and moving up to layer 7.  The 7 layers are labelled, starting with layer 1 at the bottom, 1-Physical, 2-Data Link, 3-Network, 4-Transport, 5-Session, 6-Presentation, and 7-Application. Continue reading