How about being able to load IOS into a “virtual router” for your training and study purposes? That would be pretty cool right? Read on…..
Check out the following link:
http://dynagen.org/tutorial.htm
From the authors blurb:
“Dynamips is a Cisco router emulator written by Christophe Fillot. It emulates 2691, 3620, 3640, 3660, 3725, 3745, and 7206 hardware platforms, and runs standard IOS images. In Chris’ own words:
This kind of emulator would be useful to:
· Be used as a training platform, with software used in real world. It would allow people to become more familiar with Cisco devices, Cisco being the world leader in networking technologies
· Test and experiment features of Cisco IOS
· Check quickly configurations to be deployed later on real routers.
Of course, this emulator cannot replace a real router, it is simply a complementary tool to real labs for administrators of Cisco networks or people wanting to pass their CCNA/CCNP/CCIE exams.”
I’m sure you will agree, this could be a life saver for those of you studying for CCNA or maybe higher 
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