There is no question that the software-defined networking (SDN) arena is a hotbed of new ideas, well-funded startups, and established vendor SDN architectures. However, there is a significant question about how much future revenue the SDN market can create. Relatively small revenue streams in 2012 show that SDN needs to increase its acceptance to truly impact the broad IT market. This report focuses on the market for the enterprise adoption of SDN. This includes businesses of all sizes and SDN implementations in their branch, campus, and data center networks. The report tackles the key issues with regard to SDN taxonomy, forecast assumptions, and market segmentation.