You need to add these IOS image in GNS3 in order to simulate these IOS for Networking LABS. For creating topologies in GNS3 you are required the Cisco real IOS images. So GNS3 provide you the economical way for testing your networking skills at home. GNS3 is one of best and my favorite graphical network simulator use for simulating network topologies and network Labs virtually in your personal computer. Layer 3 IOS image for GNS3 with Switching Layer 2 switching is hardware-based, which means switches use application-specific integrated circuit. How to add Layer2 Switch IOS on GNS3| Switch IOS vIOS-L2 Download| Cisco IOS Add in GNS3.
