Added another cheat sheet to the pile, this one on Multiprotocol Label Switching, or MPLS. I have to admit that although I was a bit skeptical of its application when first reading about MPLS, I've grown to love the technology for its simplicity and for the very interesting approaches it offers to common problems. One such solution is described in an earlier post, Getting to know MPLS, which discusses how MPLS can be used to transport customer traffic across a provider's network without the P routers having to maintain customer routes (a very common scenario).
As always, write in with any errors you find and I'll correct them ASAP. Comments and constructive criticism are also welcome. Nonconstructive criticism should be sent in the form of cash.