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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. The recommended Cisco images to use with GNS3 are those from Cisco VIRL (IOSv, IOSvL2, IOS-XRv, ASAv).It is good for basic CCNA type topologies, but has a number of limitations such as only supporting older Cisco IOS versions (12.X) which are also not supported or actively updated by Cisco. Dynamips is an older technology that emulates Cisco hardware.Remember: Don’t worry too much about the difference between simulation and emulation except for the following points: GNS3 emulates the hardware that VIRL images require to run You are now able to run Cisco VIRL images which are images of real Cisco operating system images which run on standardized virtual hardware. The lines between simulation and emulation blur a bit these days.

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If you decide to use the GNS3 VM (recommended), you can either run the GNS3 VM locally on your PC using virtualization software such as VMware Workstation, Virtualbox or Hyper-V or you can run the GNS3 VM remotely on a server using VMware ESXi or even in the cloud. Additional processes such as Dynamips will also be running on your PC: If for example you are using a Windows PC, both the GNS3 GUI and the local GNS3 server are running as processes in Windows. The local GNS3 server runs locally on the same PC where you installed the GNS3 all-in-one software. You have a few options for the server part of the software: When you create topologies in GNS3 using the all-in-one software GUI client, the devices created need to be hosted and run by a server process. This is what you usually see show in screenshots such as the following:

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You install the all-in-one software on your local PC (Windows, MAC, Linux) and create your topologies using this software. This is the client part of GNS3 and is graphical user interface (GUI). GNS3 consists of two software components:

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Recommendation: If you are using an older version of GNS3, it is recommended that you upgrade to the current stable release of GNS3.

You are now able to test interoperability between many vendors and even try out esoteric setups using network technologies with SDN, NFV, Linux and Docker. However, many other commercial and open source vendors are supported today in GNS3. Cisco is often discussed because that is what most network engineers are interested in learning about. GNS3 does not only support Cisco devices. Go here to see a list of appliances available: 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 vRouters, Cumulus Linux switches, Docker instances, HPE VSRs, multiple Linux appliances and many others. GNS3 has allowed network engineers to virtualize real hardware devices for over 10 years. Because of that original work, you can today use to help you do the same without paying for expensive hardware. Jeremy Grossman, the original developer of GNS3 originally created the software to help him study for his CCNP certifications. GNS3 can help you prepare for certification exams such as the Cisco CCNA, but also help you test and verify real world deployments. GNS3 is used in companies all over the world including Fortune 500 companies. By joining the GNS3 community you will be joining fellow students, network engineers, architects and others that have downloaded GNS3 over 10 million times to date. It is actively developed and supported and has a growing community of over 800,000 members.

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GNS3 is open source, free software that you can download from 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 used by hundreds of thousands of network engineers worldwide to emulate, configure, test and troubleshoot virtual and real networks.

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