I'm a recent full-time system admin, I have B.S. in computer science but I've never taken a course dealing with physical implementations of networks. In a given week I: fix computers, do vulnerability remediation, write custom in-house software, and I've started to do a lot of networking. We have a few dozen Cisco switches, lots of SM and MM fiber, 5 subnets for about 400 computers. I know how to configure new switches, setup VLANs, trunks. Would it be worth it to take an intro to cisco night class? Would I find out information that could help at work? Or, are there other free resources that will teach me everything I need to know online?