I'm using GNS3 for a few weeks now and I find it one of the best pieces of software I've ever used. In the beginning I found it very frustrating to find a decent IOS version without bugs and finding a good IDLE value. But now everything is up and running, I'm using the software everyday to practice my lab. I first used Cisco Packet Tracer but the functions of that simulator are limited to CCNA. GNS3 gives a much better real life experience as well. I detected some shortcomings in GNS3 but overall it's a very good piece of software. Thanks for sharing this software for free :)

Hey! I am currently studying for my CCNA Security 640-554 this is self-study and I don't work for an IT employer yet and need help obtaining a copy of a Cisco IOS image for first use with GNS3 please assist.