Working the CCNA exams with GNS3 software is a great way. But, you need Cisco IOS images for GNS3.
You can use many Cisco IOS images on GNS3, but most of them may be problematic.
I would recommend reading the related article to download Cisco IOS images running in GNS3.
thanks a lot, but I'm looking for any of these if available (c3550, c3650, 3750, 3850). I hope it's.
thanks in advance