What function does the control-plane node provide in a Cisco SD-Access fabric?
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Correct answer: to run a mapping system that manages endpoint to network device relationships.
Why this is the answer
The control-plane node in Cisco SD-Access, typically implemented by a Cisco Identity Services Engine (ISE) or a dedicated device, acts as a mapping system. It maintains the Host Information Protocol (HIP) database, which stores the location of endpoints (their IP addresses and MAC addresses) and their corresponding network devices (e.g., access switches). This allows for efficient forwarding of traffic within the fabric without requiring traditional MAC address learning across the entire network. Incorrect options: "to implement policies and communicate with networks outside the fabric" describes the function of the policy plane (often handled by Cisco DNA Center) and the border node, respectively. "to connect external Layer 3 networks to the SD-Access fabric" describes the function of the border node. "to connect APs and wireless endpoints to the SD-Access fabric" describes the function of the fabric edge node.
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