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Cisco IOS (originally Internetwork Operating System) is software used on most Cisco Systems routers and current Cisco network switches. (Earlier switches ran CatOS.) IOS is a package of routing, switching, internetworking and telecommunications functions integrated into a multitasking operating system.
The IOS command line interface provides a fixed set of multiple-word commands. The set available is determined by the “mode” and the privilege level of the current user. “Global configuration mode” provides commands to change the system’s configuration, and “interface configuration mode” provides commands to change the configuration of a specific interface. All commands are assigned a privilege level, from 0 to 15, and can only be accessed by users with the necessary privilege. Through the CLI, the commands available to each privilege level can be defined.
I use these new IOS images with GNS3. Its always better to use 12.4 IOS as they provide full command support. If you can’t buy original routers and switches, GNS3 is your rescue. Although nothing beats practicing on original equipment but if anything stands close to original gear, that is GNS3.
You can download latest GNS3 Network Emulator from gns3 website. It is a free-ware software.
http://www.gns3.net