Hello Dan
According to Cisco’s blueprint of the CCNP ENCOR exam topics, SD_WAN appears in the following topics:
1.4 Explain the working principles of the Cisco SD-WAN solution
1.4.a SD-WAN control and data planes elements
1.4.b Traditional WAN and SD-WAN solutions
Because the blueprint says “explain the working principles”, this usually means that you must know what the technology is and how it works at a theoretical level. This lesson sufficiently describes this, including the subsections which include the control and data planes, as well as SD-WAN solutions. The various components, as well as packages that Cisco provides for such services are also described in detail.
Based on the blueprint, as well as on Cisco’s certification guides, this lesson covers all of the stated concepts for SD-WAN.
I hope this has been helpful!
Laz