Detail GNS3 INFO
GNS3 is used by hundreds of thousands of network engineers worldwide to emulate, configure, test, and troubleshoot virtual and real networks. GNS3 allows you to run a small topology consisting of only a few devices on your laptop, to those that have many devices hosted on multiple servers or even hosted in the cloud.
GNS3 is open source, free software that you can download from GNS3 Official
GNS3 can help you prepare for certification exams such as the Cisco CCNA, but also help you test and verify real-world deployments. Jeremy Grossman, the original developer of GNS3 created the software to help him study for his CCNP certifications. Because of that original work, you can today use it to help you do the same without paying for expensive hardware.
GNS3 has allowed network engineers to virtualize real hardware devices for over 10 years. Originally only emulating Cisco devices using software called Dynamips, GNS3 has now evolved and supports many devices from multiple network vendors including Cisco virtual switches, Cisco ASAs, Brocade routers, Cumulus Linux switches, Docker instances, HPE VSRs, multiple Linux appliances, and many others. Go here to see a list of appliances available: marketplace appliances
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