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350-401 Practice Question: An architect is designing an SD-WAN deployment…
An architect is designing an SD-WAN deployment for a multinational enterprise. The design must ensure that control plane traffic remains separate from data plane traffic and that the solution can scale to thousands of sites. Which architectural component is responsible for maintaining the control plane and distributing routing information?
⚠ Common exam trap
Cisco often tests the misconception that the vBond orchestrator handles control plane functions because of its role in initial authentication and orchestration, but vBond does not distribute routing information—that is exclusively the vSmart controller's role.
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
✓
vSmart controller
The vSmart controller is the centralized control plane component in Cisco SD-WAN that distributes routing information (OMP routes) and policies to all vEdge/cEdge routers. It maintains the control plane by separating route advertisement and policy enforcement from the data plane, which is handled by the vEdge routers. This separation allows the solution to scale to thousands of sites because vSmart controllers can be clustered and do not process actual 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.
- ✗
vBond orchestrator
Why it's wrong here
vBond orchestrator authenticates and authorizes all devices, including vManage, vSmart, and vEdge routers, establishing the cryptographic handshake and identity validation for the SD-WAN overlay. It also directs network components to the correct controllers, but it never participates in route exchange or policy distribution. Thus, while essential for secure onboarding, it is not the routing control plane component.
- ✗
vManage NMS
Why it's wrong here
vManage is the centralized network management system (NMS) that provides a single pane for configuration, monitoring, and troubleshooting of the entire Cisco SD-WAN fabric. It stores configuration templates, collects telemetry, and displays operational status, yet it does not receive or propagate routing information among nodes. Because its role is purely management and visibility, it is not the control plane element for route distribution.
- ✓
vSmart controller
Why this is correct
vSmart controller is the central control plane component that runs the Overlay Management Protocol (OMP) to advertise routes and policies to all vEdge and cEdge devices. It learns reachability information from edge routers, applies centralized policies, and then computes and distributes the necessary forwarding state to maintain an optimized overlay. This makes vSmart the authoritative source for route and policy information, hence the correct answer.
- ✗
vEdge router
Why it's wrong here
vEdge router is a data plane device that resides at branch or campus sites, forwarding user traffic across secure IPsec tunnels in the SD-WAN overlay. It builds data plane connections based on the instructions and policies received from vSmart, and it generates local routing updates for the control plane, but it does not act as a centralized route distributor. Since vEdge focuses on packet forwarding rather than network-wide route control, it is not the right choice.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.