![]() 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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