Cisco DNA Center is a management and automation platform. Although it is part of the overlay, the term "overlay" usually refers to the network devices that operate in the logical plane, not the management platform. Cisco DNA Center is more of an orchestration platform that acts as the "controller" of the SD-Access network.
A. border node
A border node is a component of the Cisco SD-Access overlay architecture. It serves as the gateway between the SD-Access fabric domain and the rest of the network, including external Layer 3 networks. Border nodes handle communication between the fabric domain and networks outside the fabric, making them essential for the overlay architecture.
Border Node is part of the overlay. Check figure 5 on https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html#OverlayNetwork
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
Border Nodes are shown as members of the overlay network, thus answer A must be correct.
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
Border Nodes are shown as members of the overlay network, thus answer A must be correct.
Answer is A, unless they are splitting hairs between "Border Node" and "Fabric Border Node"
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