Everyone who is preparing for CCIE labs requires full fledge set up of routers & switches. Its a dicey situation where you scare to invest because its not sure whether the lab will going to be cleared or not and looking for return on investment also. The cheap and best solution for the problem is to use dynamips or gns3. But most of the time, the processes used by the computers not bearable and after working some time you would like to get rid from dynamips or gns. The awesome solution provided by in2dwok.Here the administrator has develped a bootable dynamips which is nont resource hungry and will help you to acehive the best results. Its free version and could be used with full swings.