In a Cisco SD-WAN network, which VPN Identifier is reserved as the transport VPN, carrying control traffic?

Question

Options

• AVPN 0
• BVPN 1
• CVPN 512
• DVPN 514

• A
  91% (53)
• B
  2% (1)
• C
  5% (3)
• D
  2% (1)

Explanation

Cisco SD-WAN Transport VPN

VPN 0 is reserved as the Transport VPN in Cisco SD-WAN, serving as the underlay network that carries all control plane traffic, including OMP (Overlay Management Protocol), BFD, and DTLS/TLS tunnels between vEdge/cEdge routers and the SD-WAN controllers (vSmart, vBond, vManage). Without VPN 0, the SD-WAN fabric cannot establish or maintain its control plane.

The distractors are incorrect because: VPN 1 is simply the first default service-side VPN used for data traffic (not reserved for transport); VPN 512 is reserved as the Management VPN, used for out-of-band device management; and VPN 514 is not a standard reserved VPN in Cisco SD-WAN architecture.

Memory Tip: Think of VPN 0 as "Zero = Foundation" - just like zero is the starting point of numbers, VPN 0 is the foundational transport layer that everything else in SD-WAN is built upon. Also remember the pair: VPN 0 = Transport (underlay), VPN 512 = Management - two reserved "special" VPNs to memorize for the exam.

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