Ok, totally bamboozled. I get it's some kind of software defined WAN tech that sounds awesome on the face of it, but what relevance is it to the CCNA? I see NOTHING in the exam objectives about it, and nothing on any forums? It just seems to be a totally out of context, random couple of pages in Todd Lammle's book, but with a hell of a lot of intricacies that are...worrying me especially if detail is required. There's no config or anything, just a hell of a lot of new concepts, buzz words and acronyms.