While it is running, the GNS3 installer will identify any pre-existing copies on your machine. If it does, a notification will ask if you want to cancel or force the installation. If none are discovered, the installation will proceed to the next phase.
The installation will also show you a list of components that you can select or deselect. Choose whatever ones you need, then get rid of the rest. If you are unfamiliar with the elements and are unsure of which ones to keep and which ones to eliminate, you may just leave it as is by using the Next button.
The remaining gns3 ios images for router 7200 download components are suggested, although some of the elements are optional and some are required. Automatically, the necessary ones are picked, and these include but are not limited to WinPCAP, which serves as a bridge between GNS3 and your network; Dynamips, which allows GNS3 and Cisco routers to run simultaneously; Wireshark, which is optional; VPCS, which is recommended; and Cpulimit, which stops QEMU from consuming the CPU excessively.
The installation files by default need some free space. This size changes in one of two ways, depending on the components you decide to keep. The overall file size in the installation window changes in real-time as you select and deselect components.
Why gns3 download
After installing GNS3, you can select the gns3 download for windows equipment you'll use to set up your laboratory. You need to be aware of GNS3's drawbacks. It cannot distribute Cisco IOS images owing to legal restrictions, so you must provide your own IOS images.
The Cisco IOS images can only be downloaded after you have registered for a CCO account. Using this account, you will be able to download the IOS images from the Cisco website. You could also download them from other websites if you're willing to accept the risks.