nothing
Its net network
How much do they make
They make over 48,000.00 yearly
Cisco offers network security certification. Podcasts like Security Now! with Steve Gibson and Leo Laporte offer a lot of free, current information on the subject of network security.
About 120,000
80000
its free to make an account
The costs of certification courses will be much depends on what kind certification it is, as there are much kinds of certifications. You can check more detail and cost about a certification based on company who hold it. As an example, for Microsoft Certification, you can check it here: http://www.microsoft.com/learning/en/us/certification/cert-overview.aspx
750,000-1000000
one million dollars
Network administrators make around 80,000 dollars per year. Not much, but it's still a good salary. If you go back into college, you may be able to make much more than that.
Certification for a piece of artwork is easily obtained for free by the artist if they are alive, if dead you can have the work appraised and that will serve as certification. To be an artist there is no certification or degree necessary.