This SD-WAN Overview and Ordering Guide (“Guide”) is intended to assist Federal agency telecommunications customers seeking to implement Software-Defined Wide Area Network (“SD-WAN”) technologies under Enterprise Infrastructure Solutions (“EIS”) contract task orders. The primary target audience of the Guide is Federal agency customers considering whether and how to incorporate SD-WAN into their telecommunications networks. This Guide incorporates information from the industry’s first voluntary SD-WAN standard – SD-WAN Service Attributes and Services (MEF 70) – published by the MEF Forum in July 2019 (hereafter “MEF 70”). SD WAN is a virtual WAN network architecture that utilizes various data transport technologies and a centralized control function to securely and intelligently connect users to applications. Unlike traditional WAN, SD-WAN decouples the transport service from its applications and software control function, resulting in a more agile, reliable and cost-effective network architecture.