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I have been using GNS3 for years for routing and switching. This is versatile and best simulator just like Cisco Packet Tracer. I really very like to work in both simulators. Nowadays a new release of GNS3 has been released. GNS3 1.5.0 RC2 Released! This is the latest version of the GNS3 and some more features are there in this release which should be discussed before start working on this. So here are some of those features.
The major new features of 1.5 are:
Docker containers...