That really depends. My college major was criminal justice, and yet I've been a systems, network, and security administrator for 13 years.
If your desire is to go to college for network administration, you will need at least 2 years to get up to speed and feel comfortable in a real world environment, and should most likely have 4 years if you wish to work for a larger company like Google, Yahoo, or Cisco.
If you have already been to college and are just into computers and want to have a job as a network admin, you'll need to follow a different path.
In any event, what you'll want to do is:
Start working at a smaller company doing close to what you'd like to do. Even if it's in sales or support, it will get you started and near other administrators that you may be able to mentor under in off time.
Study a lot. Learn how configure routers, wire ethernet cables, install computers into racks, configure switches, and SNMP.
Once you get more comfortable, see if you can transfer departments, or look for a larger company and see if you can get in as a level 1 network administrator.
Basically, try to learn as much as you can be it in college or in the real world. When it comes to many carers (and computers are no exception to this), 1 year of real world experience is like 2 years of college.
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B.E or DEGREE with good networking concepts and ability to maintain a group of systems.
Especially can solve any problem associated with system (computer )problems