Which overlay transport protocol carries encrypted control and data traffic between WAN Edge devices?

Study for the CCNP Software-Defined Wide Area Network (SD-WAN) Exam. Master key concepts with flashcards and multiple choice questions, each complete with hints and explanations. Gear up to ace your exam!

Multiple Choice

Which overlay transport protocol carries encrypted control and data traffic between WAN Edge devices?

Explanation:
The overlay transport protocol used to carry encrypted control and data traffic between WAN Edge devices is DTLS/TLS. In SD-WAN, the overlay tunnel must secure both control-plane messages (routing, signaling, policy) and data-plane traffic. TLS provides mutual authentication and encryption for control communications, while DTLS brings the same security to datagram (UDP) traffic, which many overlays use for efficiency and NAT traversal. This setup ensures confidentiality, integrity, and authenticity across the entire overlay between WAN Edges. The other options aren’t suited for this role: CAPWAP is for wireless AP management, STP is a layer 2 loop-prevention protocol, and SNMP is a management protocol.

The overlay transport protocol used to carry encrypted control and data traffic between WAN Edge devices is DTLS/TLS. In SD-WAN, the overlay tunnel must secure both control-plane messages (routing, signaling, policy) and data-plane traffic. TLS provides mutual authentication and encryption for control communications, while DTLS brings the same security to datagram (UDP) traffic, which many overlays use for efficiency and NAT traversal. This setup ensures confidentiality, integrity, and authenticity across the entire overlay between WAN Edges. The other options aren’t suited for this role: CAPWAP is for wireless AP management, STP is a layer 2 loop-prevention protocol, and SNMP is a management protocol.

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