“…Hence, the emulators must be discrete-event driven, open source, Emulab uses NS topology specifications to define network topology that is then emulated using the NS emulator[56]. Despite the time and space shared nature of Emulab, A.Perez-Garcia et al in[57] claim that the emulation results on Emulab are repeatable to a given extent. Emulab does have ample amounts of documentation and different kinds…”