This is again a pretty straight-forward lab where I set up simple four-node IGP networks (EIGRPv4, OSPFv2, OSPFv3) and then turn on authentication between the neighbors. It's something you should definitely be doing in your own production network to obfuscate your routing updates and keep unauthorized members from joining your IGP hive-mind.
I'll do something interesting on this one (and maybe on future labs). I'll post both the completed lab, like I've been doing previously, as well as an incomplete one with basic topology setup so you can complete it yourself.
The topology follows and you can find the download links below it.
Find both the incomplete and complete download here: http://1drv.ms/1s1g0hp