CCDE: Cisco Certified Design Expert (Practical) — Question 198

A software-defined network can be defined as a network with an API that allows applications to understand and react to the state of the network in near real time. A vendor is building an SDN solution that exposes an API to the RIB and potentially the forwarding engine directly. The solution provides off-box processes with the capability to interact with the routing table in the same way as a distributed routing process. Which SDN framework model does the solution use?

Answer options

• A. replace
• B. augmented
• C. hybrid
• D. distributed

Correct answer: C

Explanation

The correct answer is C, hybrid, because this model combines both centralized and distributed elements, enabling off-box processes to manage the routing table similarly to a distributed routing process. Option A, replace, suggests a complete substitution of models, which is not the case here. Option B, augmented, implies enhancements to an existing model without the direct interaction described. Option D, distributed, does not encompass the direct API interaction with the RIB and forwarding engine that characterizes a hybrid approach.