With GNS3 however, you have to source additional content for studying for exams / certs. F5, Juniper, Windows or Linux boxes etc) in the same topology with your Cisco routers and switches. However, it's very powerful once you get it working and absolutely excellent for emulating a lot of other devices (ex. It takes a little bit more trouble to set up if you're new to it. You can always supplement with GNS3 but be aware that with GNS3 you have to source your own IOS, IOU or vIOS images etc. In order to save the running configuration on a router or a switch, you could issue the copy running-config startup-config command (also known as copy run start ), then use File -> Save As to complete the action. If you don't have the gear and you need to study on the go, I guess you really can't go wrong. Note that NetSim does not store the contents of the NVRAM when it saves files. The ExSim pack is great value for the money - I also found a voucher online for a slight discount on the purchase :) I did purchase the ExSim (exam simulators) for ROUTE and TSHOOT (have already passed switch) because I already had a lot of other study resources purchased before getting more info on NetSim.
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