How to add Cisco IOS in GNS3 | Install IOS on GNS3 | GNS3 for Beginners.Cisco IOS for Beginners,GNS3 for Beginners,GNS3 Fundamentals,Install IOS on GNS3,GNS3,GNS3 2.0.3,GNS3 2.0.1,Latest GNS3. Cisco IOS,
Cisco IOS (originally Internetwork Operating System) is a family of software used on most Cisco Systems routers and current Cisco network switches. (Earlier switches ran CatOS.) IOS is a package of routing, switching, internetworking and telecommunications functions integrated into a multitasking operating system.GNS3 offers multiple ways to emulate IOS. For older images, we use and maintain Dynamips; an emulator dedicated to emulate some Cisco hardware. Dynamips can run unmodified IOS images. In the new GNS3 1.4, there is a way to run a second category of switches and routers.IOS images are usually run in Dynamips however R+Svms are housed in a virtual machine.
IOS images are lower in cpu and memory so you can fit more of them in one topology.
R+Svms are all vendor Routing and Switching images that are larger in size but can be imported into GNS3 for real world network emulation

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