It is essential that you start with the basics... and I would suggest to know IPv4 inside and out as it's here with us for another 25 years by some analysts estimates.
Here is THE book that did it for me and also allowed me to pass the Cisco entry-level CCNA exam:
http://www.amazon.com/exec
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by: -Leo-Posted on 2005-03-12 at 02:48:52ID: 13523930
The best way to start is to attend networking basics courses first and then get some hands-on experience.
If you short on the budget, buy some networking essentials books (try Amazon.com or local shops), get 2 x PC's wired into the LAN, get second use switch and couple of routers, you can buy all this stuff for $1 - $1,5K but these expences will help you to get a job in the future. 3 monthes should be enough for this ... if you looking for free CBT manuals you can try Emule or Edonkey but this is illegal by the way :)