Which two statements describe Cisco SD-Access fabric elements?
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Correct answer: The border node is required for communication between fabric and nonfabric devices., The control plane node has the full RLOC-to-EID mapping database..
Why this is the answer
The border node is essential for connecting the SD-Access fabric to external networks, allowing communication between devices within the fabric and those outside it. Without a border node, fabric devices cannot reach non-fabric devices, and vice-versa. The control plane node, specifically the LISP Map-Server/Map-Resolver, maintains the complete mapping database of Endpoint Identifiers (EIDs) to Routing Locators (RLOCs). This database is crucial for locating endpoints within the fabric. Traffic within the fabric typically flows directly between fabric edge nodes (data plane) once the control plane has resolved the EID-to-RLOC mapping; it does not always pass through the control plane node for data forwarding. Fabric endpoints connect to fabric edge nodes, not directly to the border node. While the border node participates in the LISP control plane, it does not hold the full EID-to-RLOC mapping database; that is the role of the control plane node.
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