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In GUI mode, you have graphic interface which allows the user to interact with the system in a much better and easy way.

CLI is the basic text-based environment, where you can configure your Cisco device by using different commands. Users can interact with Cisco hardware through the command line interface (CLI) or the graphical user interface (GUI). By default every Cisco device have a installed IOS images but you can change and reinstall the new version IOS anytime. With new GNS3 you have IOU and GNS3 appliances available for different virtual networking labs.Ĭisco IOS image is a collection of network operating functions and systems used in Cisco network appliances and these IOS images allow the users to interact with the hardware of Cisco devices. These are the working Cisco IOS images, which are tested and verified with the latest version of Gns3. Or if you have a server, download the CML on the server and make sure the server is able to handle it.In this article i will share you the list of NEW Cisco IOS Images which are available for download. The only think you need to think about is you need a solid computer with x amount of RAM (the more nodes, the more RAM and storage is required) and storage. You can download bunch of stuff, like Nexus, Fortigate, ASA, routers, switches, servers and so on. You can even download the images and use it offline so it is not that you need to pay $199 every year. You can purchase CML from Cisco website and it will cost you $199/year and I will highly recommend you to invest in it. You also have EVE-NG (which is not Cisco) and I personally have not used it but it’s looks much nicer than GNS3. What I (and most of the people) recommend is Ciscos own virtual lab, CML (Cisco Modeling Lab) that is equivalent to GNS3 but a little bit better. There are free IOS images but would not recommend you to download those.