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Layer 2 Ethernet switching inside of a GNS3 topology is limited to the switchport modules that can be added to the virtual routers inside of GNS3, which doesn’t support the full layer 2 switching capabilities that a physical switch would provide. As a result, many people want to have interaction between their GNS3 network and live network gear, which they can do by using logical Ethernet connections. Many learners choose to purchase a single physical router, and use the related IOS image in their virtual GNS3 topology. Though GNS3 supports hardware emulation for several models of Cisco routers, it doesn’t provide the actual IOS. It’s easy to add Ethernet connections between the devices, or to add hardware modules to the routers in the virtual GNS3 topology for more complex network designs. But it goes beyond that: users can quickly set up routers and firewalls, using simple drag-and-drop actions on the screen. The primary draw of GNS3 is that it affords anyone with a computer a way to practice network topologies. GNS3 is the front-end for multiple hypervisors, including Dynamips and Qemu, with the latter being used to emulate hardware used by the Cisco Adaptive Security Appliance (ASA) firewall. But more recently, a GUI was added to manage the process of the hypervisor, and the GUI is currently called the Graphic Network Simulator (GNS3). Dynamips was intended to emulate Cisco IOS hardware – and was fairly complicated to implement – which put it out of reach of the average learner.
GNS3 was introduced many years ago, when an open-source hypervisor called Dynamips was written to emulate Cisco routers.
This is because the learner is interacting with the real Cisco IOS operating system that is running on virtualized routers. By running Cisco IOS software on the hypervisor, the user can create complex networking scenarios with the real look and feel of hardware devices. GNS3 is a hardware emulator (called a hypervisor), which creates a virtual environment on a host computer (such as Windows, Linux or Mac). How then does a network engineer or aspiring network engineer get hands-on practice? One solution is GNS3.
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But it can be very challenging for a Cisco student to access live gear to practice the implementation, verification and troubleshooting of both simple and complex network configurations. Study resources, including books, classes, and videos, are easy to find. To become an expert in Cisco technologies or products, you need both study and hands-on practice.
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