Since arranging physical devices, such as Cisco routers and switches is probably not possible for everyone. One of the great features of GNS3 simulator is that it allows you to perform real-life hands-on lab exercises.
We assume that you have already downloaded and installed the GNS3 simulator on your system. If you have not yet worked with GNS3, we would highly recommend you to visit the following links that will guide you how to download and use GNS3. Using GNS3 is not as difficult as people think. We assume you follow the legal license terms. Note: Some of the above-mentioned links may not work because it might be possible that their URLs are changed or the IOS images are removed from the hosting server.
Take a quick look at the following step by step GNS3 tutorials and start to learn from the beginning to advance GNS3 configurations. Please drop your queries in the comment box, if you face any issues. If you are the network engineer you must aware with the most famous network simulator that is GNS3. GNS3 can emulate a number of different Cisco router models, but we have found Cisco and series to be the most stable in GNS3.
We will use the IOS image cadventerprisek9-mz. 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.
Step 5: Now assign the amount memory RAM to this device and press next, MB memory would be enough for simple operations. Note: You can run any number of instances of a single router installed on gns3. In gns3 GUI application windows click on browse all device menu button it would look like this.
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