The source code is available on GitHub if you are interested in taking a peek at the code. Today, you have multiple choices when studying and testing networks:Īs mentioned, GNS3 is open source software which you can download and use for free. A lot of this is down to personal preference with all solutions providing some benefits and having some disadvantages.īad old days: The world today is much better than the past! In the old days, network engineers studying for their CCNAs, CCNPs or CCIEs only had limited choices: Buy or rent physical Cisco equipment for your studies. Questions often arise about which software is the best. The images support current releases of the Cisco IOS (15.X) and provide the best scale and user experience. This images are supported and are actively updated by Cisco.
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