What is the purpose of vpn 0 in a WAN Edge onboarding template?
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Correct answer: It carries control traffic over secure DTLS or TLS connections between vSmart controllers and vEdge routers, and between vSmart and vBond..
Why this is the answer
VPN 0, also known as the transport VPN, is crucial for establishing the SD-WAN overlay. It carries all control plane traffic, specifically secure DTLS (Datagram Transport Layer Security) or TLS (Transport Layer Security) connections. These connections are essential for communication between vSmart controllers and vEdge routers, allowing vSmart to distribute policies and routing information. Additionally, VPN 0 facilitates the secure communication between vSmart controllers and vBond orchestrators, enabling device authentication and initial onboarding. The other options are incorrect because IPsec is used for data plane encryption in VPNs 1-511, not for the control plane in VPN 0. Out-of-band management traffic typically uses a dedicated management VPN (VPN 512).
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