They are highly specific to Cisco hardware, in terms of router/switch configs. I took CCNA classes (all 4) in high school and it was good experience for learnin

They are highly specific to Cisco hardware, in terms of router/switch configs. I took CCNA classes (all 4) in high school and it was good experience for learning some of the underlying principles, but its not exactly heavy on the theory or technology. You can learn almost all of it on your own if you are dedicated. There is a program called "Packet Tracer" that allows you to simulate routers, switches, networks, hosts, etc. but there isn't a real good substitute for hands on experience. You can pick up a cheap home network set for under a few hundred dollars, though. I'd recommend making a home network, rather than paying for classes, if you are dedicated enough, as a home network will be useful for extending your knowledge in security as well. If you key focus is getting a job and career progression, get the cert. Otherwise, I wouldn't bother wasting the money, just for the knowledge.