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Software-Defined WAN (SD-WAN) is the second “software-defined” marketing attempt (after the original SDN) to dress a conglomerate of old technologies into shiny new clothes. Even Wikipedia article promotes some of the usual software-defined hype, quoting Network World claim that:

SD-WAN simplifies the management and operation of a WAN by decoupling the networking hardware from its control mechanism. This concept is similar to how software-defined networking implements virtualization technology to improve data center management and operation.

I firmly believe that you cannot be a good networking engineer¹ without a firm grasp of the networking fundamentals, and I couldn’t resist pointing that out a few times (see also certifications-related posts):

• When You Find Yourself on Mount Stupid
• Appreciating the Networking Fundamentals
• Grasp the Fundamentals before Spreading Opinions
• Learning Networking Fundamentals at University?
• You Must Understand the Fundamentals to Be Successful

Regardless of how far down this page you’ll get, these blog posts are a must-read: