Hello, in this post we are going to present something that is very important so that you can do all your laboratories on GNS3 without any problem, and this are the Operating System images of the network devices, called commonly IOS images. These are images of the real Operating Systems that are used on physical network devices such as routers, switches, firewalls, and so on, they can be from CISCO or from other vendors like Juniper (Juniper images). So once you get GNS3 installed, the next step is to download the images of the devices you are going to use for your practices and then implement them onto the GNS3 emulator. (If you do not know how to do it, visit the GNS3 tutorials on this link: ). There are many IOS images of different networks devices on the web, but some of them are the most used on GNS3, to do the networking exercises to practice or prepare CCNA, CCNA or even CCIE and real Labs of networking as if you were working with real network devices, since the images come with all the features supported, for example by a physical router or switch.

Jun 24, 2016 - In order to perform CCNA and CCNP hands-on lab exercises, either you need. Since arranging physical devices, such as Cisco routers and switches. However, you need to download IOS images for GNS3 before you can.

Therefore is important to have this images and in this post you will get the links to download therefore following we are going to list all the ISOs that are useful for GNS3 and using in your networking studies. Feel free to use them for your Cisco certification studies, specially CCNP, CCIE and from other vendors like: Juniper, JNCIA, JNCIS and JNCIE. (But you can also practice CCNA with GNS3, although to start your studies, packet tracer is recommendable). Here the links to download. According to some articles, there are some specific IOS images, that are recommended because they are the most stable in GNS3, without any RAM issue. So the: c3640, c3660, c3725, c3745 and c7200 IOS images are the ones you can download and use to practice without any further problem in GNS3. Do you want more IOS images?

Don't worry, here we have a good website called 'srijit.com' where you can search and download more IOS. These images were even tested and checked with the latest version of GNS3, in order to have stable IOS, you can check out the website on the following link.

Cisco IOS GNS3 – Srijit’s Blog All the IOS, IOU, Nexus and other images has been updated, checked and verified with latest GNS3 & GSN3 VM. Download here – Feel free to download them and use them for your Cisco certifications studies. Old ones are kept intact for your reference- • 1700 – • 2600 – • 2691 – • 3640 – • 3660 – • 3725 – • 3745 – • 7200 (v15) – • 7200p (v15) – Mirror Links: 1. If you face any problem setting it up with GNS3 drop me a message and I will get back to you asap. GNS3 is an open source (GNU GPL) software that simulates complex networks while being as close as possible from the way real networks perform, all of this without having dedicated network hardware such as routers and switches. GNS3 provides an intuitive graphical user interface to design and configure virtual networks, it runs on traditional PC hardware and may be used on multiple operating systems, including Windows, Linux, and Mac OS X.

In order to provide complete and accurate simulations, GNS3 actually uses the following emulators to run the very same operating systems as in real networks: • Dynamips, the well known Cisco IOS emulator. • VirtualBox, runs desktop and server operating systems as well as Juniper JunOS.