300-415 · Question #80
Which VPN connects the transport-side WAN Edge interface to the underlay/WAN network?
The correct answer is C. VPN 0. VPN 0 is the transport VPN in Cisco SD-WAN that carries all underlay WAN connectivity, connecting WAN Edge transport interfaces directly to the WAN or internet.
Question
Options
- AVPN 1
- BVPN 511
- CVPN 0
- DVPN 512
How the community answered
(39 responses)- A3% (1)
- B5% (2)
- C90% (35)
- D3% (1)
Why each option
VPN 0 is the transport VPN in Cisco SD-WAN that carries all underlay WAN connectivity, connecting WAN Edge transport interfaces directly to the WAN or internet.
VPN 1 is the default service-side VPN used for LAN-facing traffic and user data forwarding; it is not the transport VPN.
VPN 511 is not a standard reserved VPN in the Cisco SD-WAN architecture.
VPN 0 is the designated transport VPN where all WAN-facing interfaces are placed in Cisco SD-WAN. It carries the underlay routing (static routes or dynamic protocols toward the ISP) and is the VPN within which DTLS/TLS control tunnels to controllers and IPsec data plane tunnels to other WAN Edge routers are initiated.
VPN 512 is the out-of-band management VPN used to reach device management interfaces such as SSH; it is not the WAN transport VPN.
Concept tested: SD-WAN VPN 0 as the designated transport VPN
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/system-interface/ios-xe-17/systems-interfaces-book-xe/system-interface.html
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