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1.1 ! markd 1: GNS3 is a graphical network simulator that allows you to design complex ! 2: network topologies. You may run simulations or configure devices ranging from ! 3: simple workstations to powerful Cisco routers. It is based on Dynamips, an IOS ! 4: emulator which allows users to run IOS binary images from Cisco Systems and ! 5: Pemu, an PIX firewall emulator based on Qemu.