Research indicates that 79% have already begun the Journey to SD-WAN. After two years of marketing hype, Software-Defined WAN has arrived and is officially poised for widespread market adoption in 2018. Want to know why SD-WAN is heating up? Help yourself to a free download of the 2018 Guide to WAN Architecture and Design, Part 1 by Dr. Jim Metzler. This report evaluates the State of the WAN based on market survey data plus analyst insights.