Which protocol protects Cisco SD‑WAN control-plane communication?
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Correct answer: DTLS.
Why this is the answer
DTLS (Datagram Transport Layer Security) protects the control plane communication in Cisco SD-WAN by providing encryption and authentication for the OMP (Overlay Management Protocol) sessions between vSmart controllers and WAN Edge devices. This ensures the integrity and confidentiality of routing and policy information exchanged across the overlay. While IPsec is used for data plane encryption between WAN Edge devices, it does not secure the control plane. OMP is the protocol being secured, not the security mechanism itself. STUN (Session Traversal Utilities for NAT) is used for NAT traversal, not for securing control plane communication.
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