Part of my responsibilities as a Network Programmer early in my career included supporting an enterprise implementation of Novell NetWare. It was the mid-1990s, and Novell had a dominant hold on the network operating system market. I decided it would be in my best interest to become a Certified Novell Engineer (CNE). A few months and several intense examinations later, I obtained my very own version of this certificate:
The most demanding examination in the series focused on networking concepts and the OSI model, which provides seven layers for computer systems to use when communicating over a network.