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Mininet is an emulator for deploying large networks on the limited resources of a simple single Computer or Virtual Machine. Mininet has been created for enabling research in Software Defined Networking (SDN) and OpenFlow. Mininet emulator allows running unmodified code interactively on virtual hardware on a simple PC. It provides convenience and realism at very low cost. The alternative to Mininet is hardware test beds which are fast, accurate but very expensive and shared. The other option is to use simulator which is very cheap but sometimes slow and require code modification. Mininet offers ease of use, performance accuracy and scalability.