For network administrator abilities I would say, Anything that has to do with electronics you should knowhow to fix. It may sound crazy but a friend of mine was always asked to fix phones, televisions, projectors and everything else electronic.
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Mike,
I must ask. As you had to deal with Cisco routers and the various. In everything you have seen. Is Cisco the most used in networks?
I had to drop out of my Networking Course but the only course I missed was Cisco and I am in question weither I should put down 2000$ and do Cisco till CCIE