GNS3

What is GNS3? GNS3 is used by hundreds of thousands of network engineers worldwide to emulate, configure, test and troubleshoot virtual and real networks. GNS3 allows you to run a small topology consisting of only a few devices on your laptop, to those that have many devices hosted on multiple servers or even hosted in the cloud. Architecture GNS3 consists of two software components the GNS3-all-in-one software GUI client and the server.