image. Unlike the heavy resource-hogging images Alex had tried before, this IOU binary was lean. It didn't need a full virtual hardware stack to run; it lived directly on the Linux subsystem of the GNS3 VM. With this specific image, Alex was able to:
: This means it is an L3 (Layer 3/Router) image compiled to run on Linux (x86 architecture). i86bi-linux-adventerprisek9-ms.154-1.t-antigns3.bin
: Instead of just 3 routers, Alex built a topology of 20 routers. Study Advanced Features i86bi-linux-adventerprisek9-ms.154-1.t-antigns3.bin