Per the ENSLD 300-420 book, page 278-279... Metro Ethernet should be "same technology that is used in the LAN" and "bandwidth increased dynamically without installing new equipment".
SD-WAN : large-scale IoT and mobile global enterprises deployments
Through the vManage dashboard, you can monitor cloud-native applications and employee devices alongside the IoT devices in your network so that you never miss a beat.
https://blogs.cisco.com/networking/cisco-sd-wan-the-crossroads-of-enterprise-and-iot
Metro Ethernet is Ethernet, typically delivered over fibre to get the range needed for metropolitan areas. Ethernet=LAN technology. SD-WAN characteristics in the answer above are accurate. Answer as shown is correct.
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