Which protocol forms the Cisco SD-Access fabric data plane?
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Correct answer: VXLAN.
Why this is the answer
VXLAN (Virtual Extensible LAN) is the correct answer because it encapsulates user traffic (data plane) over the underlay network in Cisco SD-Access. It provides the necessary overlay for extending Layer 2 segments over a Layer 3 infrastructure, enabling network virtualization and segmentation. LISP (Locator/ID Separation Protocol) is incorrect because it forms the control plane, mapping endpoints to their locations. Cisco TrustSec is incorrect as it provides policy-based access control and segmentation, not the data plane encapsulation. IS-IS is incorrect because it is an interior gateway protocol used for routing in the underlay network, not for the SD-Access fabric data plane.
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