In Cisco SD-Access, which protocol does an extended node use to connect to a single edge node?
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Correct answer: 802.1Q.
Why this is the answer
An extended node in Cisco SD-Access uses 802.1Q (VLAN tagging) to connect to a single edge node. This allows the extended node to carry multiple VLANs over a single physical link, enabling the segmentation and policy enforcement provided by SD-Access. VXLAN is used for overlay encapsulation between fabric nodes, not for the connection between an extended node and an edge node. IS-IS is a routing protocol used within the underlay network, not for extended node connectivity. CTS (Cisco TrustSec) is used for policy enforcement and security group tagging, but not as the underlying link protocol for extended node attachment.
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