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Go to this link

http://www.geocities.com/baristhasharma/mimicvlab.html

I have tried it and benefitted a lot.
So wanted to share my experience.
It is just $99 and worths many hundreds dollars.
Has hundreds of Cisco IOS commands. Has lot of configurations
supported, e.g., RIP, OSPF, EIGRP, Access lists, BGP, eBGP, NAT, VLAN,
Frame Relay, IS-IS, ISDN, LAN, WAN, Serial links, TFTP and on and on...
MIMIC Virtual Lab creates a real world lab environment with a network
of Cisco Routers and Switches. It gives hands-on learning experience
without buying expensive equipment.