Which protocol is the default for control-plane connections?
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Correct answer: DTLS.
Why this is the answer
DTLS (Datagram Transport Layer Security) is the default protocol used for securing control-plane connections in Cisco SD-WAN. It provides security for UDP-based communications, which is essential for the real-time nature of control-plane traffic. HTTPS is an application-layer protocol primarily used for web traffic. TLS (Transport Layer Security) is the secure version of TCP, but control-plane connections often utilize UDP for efficiency. IPsec is a suite of protocols for securing IP communications, but DTLS is specifically chosen for its UDP compatibility in this context.
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