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350-401 Practice Question: Which two statements about SD-WAN architecture…
Which two statements about SD-WAN architecture are true? (Choose two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The vSmart controller is responsible for distributing routing and policy information to the WAN edge routers.
In Cisco SD-WAN, the vSmart controller is responsible for centralized control and policy distribution, while the vBond orchestrator handles authentication and NAT traversal. The vManage is the management plane. vEdge routers establish OMP sessions with vSmart, not with each other. Control plane traffic between vSmart and vEdge is secured with DTLS or TLS, not IPsec. The vBond is not involved in forwarding data traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The vSmart controller is responsible for distributing routing and policy information to the WAN edge routers.
Why this is correct
Correct because vSmart acts as the control plane, using OMP to distribute routes and policies to vEdge/cEdge routers.
- ✓
vEdge routers establish IPsec tunnels directly with each other for data plane traffic.
Why this is correct
Correct because vEdge routers form direct IPsec tunnels (also called secure tunnels) between themselves for forwarding user data.
- ✗
The vBond orchestrator is responsible for forwarding data traffic between branch sites.
Why it's wrong here
Incorrect because vBond only performs authentication, NAT traversal, and orchestration; it does not forward data traffic.
- ✗
vEdge routers establish OMP sessions with each other to exchange control plane information.
Why it's wrong here
Incorrect because OMP sessions are established between vEdge routers and the vSmart controller, not between vEdge routers directly.
- ✗
Control plane communication between vSmart and vEdge is secured using IPsec.
Why it's wrong here
Incorrect because control plane communication uses DTLS or TLS, not IPsec. IPsec is used for data plane tunnels.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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Last reviewed: Jun 18, 2026
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