Which controller delivers the centralized policy to the fabric?

A.

In a Cisco SD-WAN solution, the vSmart controller is responsible for providing centralized control plane and management functions. It's a key component that provides policy and topology information to the WAN Edge routers (also called vEdge routers), which use this information to make forwarding decisions.

When it comes to influencing network route advertisement, a centralized policy can be defined on the vSmart controller using the Policy feature. This policy can specify what routes are allowed or denied, what routing protocol to use, and other conditions based on different criteria such as source/destination address, application, or quality of service (QoS).

Once the policy is defined on the vSmart controller, it's pushed to the WAN Edge routers using the Control plane, which is managed by the vSmart controller. The Control plane distributes the policy to the appropriate WAN Edge routers based on their location and role in the network. This allows the WAN Edge routers to enforce the policy by controlling the flow of traffic and selecting the best path based on the defined criteria.

Therefore, the correct answer to the question is A. vSmart, since it's responsible for delivering the centralized policy to the fabric. vBond is responsible for device onboarding and authentication, vManage is responsible for providing a centralized management interface, and WAN Edge routers are responsible for forwarding traffic based on the policy received from the vSmart controller.