Packetlife.net offers some “cheat sheets” with useful information. This are like very small handbooks with the most useful informations about BGP, EIGRP, IPsec, Multicast, IS-IS, OSPF, Spanning-Three, TCPdump and more. I found this very useful during my preparations for Cisco exams and not only, so I want to share them here. Of course any copyrights goes to the owner of packetlife.net. And if you are worry about the “cheat” word, look what the owner of packetlife.net is saying:

“Are these for cheating?

No. The term “cheat sheet” is a slang term for a small collection of notes or a quick reference guide (my apologies if this isn’t a familiar term in your locale). I don’t condone cheating of any sort, and you’re only doing yourself a disservice if you decide to take that path.”

You can check this materials at: http://packetlife.net/cheatsheets/