GNS3 is free network simulator software. It emulates and simulates routers, switches, and other networking devices. Cisco uses proprietary software for its routers and switches. This software is known as Cisco IOS. GNS3 can run Cisco IOS. Since Cisco IOS is protected by copyright laws, GNS3 does not include any Cisco IOS in its default installation. It only provides a platform to use Cisco IOS, but it does not provide any Cisco IOS itself. To use a Cisco device in GNS3, you need to download and import its IOS to GNS3.
IOS image is software or Operating System used in most Cisco routers and switches. IOS images support different packages like routing, switching, and inter-networking, etc. You can use these IOS images with GNS3. Gns3 is one of the famous network simulators and its hot feature is that it can run the real Cisco IOS image, as compared to another network simulator like packet-tracer which performs all functions based on programming. If you are a beginner then learn more here:Cisco Switch Basic Configuration, how to use or configure GNS3
Working Cisco Ios For Gns3
Set console password: Router#config terminal Router(config)#line console 0 Router(config-line)#password cisco Router(config-line)#login Router(config-line)#exit
Set vty (virtual terminal lines) password: Router#config terminal Router(config)#line vty 0 4 Router(config-line)#password cisco Router(config-line)#login Router(config-line)#exit 2ff7e9595c
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