A few months ago, I wrote ',' and the second suggestion I listed for improving your abilities was to use a simulator. However, while simulators are useful, there's something even better that you can get for free — an emulator. What's the difference? A simulator attempts to re-create the Cisco IOS using a programming language, but an emulator takes the real IOS router code, which you supply, and emulates the hardware behind it so you can run the real IOS on your PC. With a simulator, there are always missing commands and programming errors, and it can never really be as complete as the real IOS. However, because an emulator runs the IOS, you get every feature that the real IOS has (based on the limitations of the emulated hardware, of course). For example, if your emulated hardware has a Gig Ethernet interface, and the IOS supports a Gig Ethernet interface on that platform, then you can use the Gig Ethernet interface.

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If, however, your emulated hardware doesn't have a VoIP FXS card, then you wouldn't be able to configure one in the Cisco IOS, even if the IOS supported it. What is Dynamips? You can use the for training purposes and testing configurations. You can create configurations and later deploy them to real routers. The Dynamips Emulator can boot IOS images from 7200, 3600, 3700, and 2600 series routers, even including the latest and greatest 12.4T IOS (something that my old 2600 router can't do because it doesn't have enough RAM). One caveat is that you must supply the IOS for any router that you're going to emulate. It is, of course, illegal to distribute the IOS and only legal to obtain it by purchasing and downloading it from Cisco.