SD-WAN, SDN, NFV, and VNFs all share similar principles and goals but with so many acronyms and each one building on another, it can be confusing about how they work together. A clear understanding of the terms and underlying principles will illuminate the power achieved by implementing these architectures and technologies in your wide area network (WAN). This Technical Brief Guide to SDN, SD-WAN, NFV, and VNF from CBTS describes the difference and provides a tailored cloud solution.