If you are not an authorized Cisco employee or trusted partner, usage of Cisco IOU is potentially a legal gray area. However, the legality of the source of Cisco images for GNS3 is questionable. One key advantage that Cisco IOU has is that it does not require nearly as much resources as GNS3 and VIRL would require. IOU was built as a native Solaris image and runs just like any other program.
It is a fully working version of IOS that runs as a user mode UNIX (Solaris) process. Cisco IOS on UNIX (IOU) is another option for running Cisco routers in a virtual environment. GNS3 is a well-known free network simulation platform that has been around for many years. Until a few years ago it was the only option available, or you had to rent lab hours through one of the training companies. I have seen people spend hundreds or thousands of dollars (myself included) buying used networking equipment in order to build a home Cisco lab to gain practical experiences and study for certification exams. Whether you are studying for Cisco certification or just wanting to test certain network behaviors in a lab, no one would argue that practicing is the best way to learn. One of the most difficult things for people who are starting out in a networking career is getting their hands on the equipment.
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