Even you can configure/control the small office network with GNS3 router without using a real router. The main advantage of GNS3 lies in hardware emulation, since you can connect GNS3 devices to real world therefore you can ping/telnet GNS3 router from anywhere even from over the internet.
GNS3 supports devices and IOS of more vendors like Cisco, Juniper, Linux host etc.You can take packet capture with Wireshark between devices which you are simulating in GNS3.One of key advantage of GNS3 is that you can connect the simulated device or network to real world/devices.Some of new commands may not works with Packet Tracer. Whereas the Packet Tracer is software base simulator which only allows the limited commands which are programed. Gns3 uses real IOS software to simulate the different virtual devices, so you enjoy the new features of IOS with using new IOS in GNS3.
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