There are a few other virtual labs that I use for this book and other purposes. The GNS3 tool is one of them:
As mentioned previously in this chapter, GNS3 is what a lot of us used to study for certification tests and to practice for labs. The tool has really grown up from the early days of the simple frontend for Dynamips into a viable commercial product. Cisco-made tools, such as VIRL, DevNet, and dCloud, only contain Cisco technologies. Even though they provide ways for virtual lab devices to communicate with the outside world, they are not as easy as just having multi-vendor virtualized appliances living directly in the simulation ...
