What are two characteristics of Cisco SD-Access elements? (Choose two)

Question

Options

• AThe border node is required for communication between fabric and nonfabric devices.
• BFabric endpoints are connected directly to the border node
• CTraffic within the fabric always goes through the control plane node
• DThe control plane node has the full RLOC-to-EID mapping database
• EThe border node has the full RLOC-to-EID mapping database

• A
  93% (27)
• C
  3% (1)
• E
  3% (1)

Explanation

Cisco SD-Access Elements Explanation

Why A and D are correct: The border node acts as the gateway between the SD-Access fabric and external networks (non-fabric devices like the internet or legacy infrastructure), making it essential for fabric-to-nonfabric communication. The control plane node (based on LISP) maintains the complete RLOC-to-EID mapping database, which maps endpoint identifiers (EIDs) to routing locators (RLOCs), enabling fabric devices to locate any endpoint.

Why the distractors are wrong:

• B is incorrect because fabric endpoints connect to edge nodes, not border nodes - border nodes handle external connectivity
• C is incorrect because data plane traffic flows directly between fabric nodes (edge-to-edge via VXLAN tunnels); the control plane node is only consulted for mapping lookups, not every packet
• E is incorrect because the full RLOC-to-EID mapping database resides on the control plane node, not the border node

Memory Tip: Think of the roles by name - the Control Plane node controls the map (EID-to-RLOC database), the Border node sits at the border between fabric and non-fabric worlds, and Edge nodes connect endpoints at the edge of the fabric. Each name literally describes its function!

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