CCDE: Cisco Certified Design Expert (Practical) — Question 227

A software-defined networking (SDN) controller learns network topology information by using BGP link-state sessions with the route reflectors of an MPLS-enabled network. The controller then uses the topology information to apply on-demand traffic policies to the network through a protocol that is supported from all Layer 3 routers. Each policy is represented as a RIB entry in the control plane of the router. Which SDN model has been implemented?

Answer options

• A. SDN centralized
• B. SDN traffic engineering
• C. SD-WAN
• D. SDN hybrid

Correct answer: D

Explanation

The SDN hybrid model is correct because it combines centralized control with distributed data plane functionality, allowing the controller to utilize the RIB entries for applying traffic policies. The other options do not fully encompass the use of BGP link-state sessions and the integration of Layer 3 routers in this context.