Yesterday, I had to take a "network administration" test for a job I applied for. It was almost all OSI layer, IPv4 math, and IP protocol questions. Simple, basic, Net + stuff, not anything that really applies to net admin stuff. Anyway, It gets me every time I study for this stuff or take a test - the only time I have ever needed to know the OSI layers has been on tests! Outsid of being a product developer, has anyone here ever really needed to know this information?