Discover the key features and benefits of the ‘augmented’ SDN framework, a powerful approach to implementing software-defined networking while leveraging existing network infrastructure. Become an expert in the Cisco 400-007 certification exam.
Table of Contents
Question
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?
A. replace
B. augmented
C. hybrid
D. distributed
Answer
B. augmented
Explanation
The solution described in the question utilizes the “augmented” SDN framework model. In this model, the existing network infrastructure and protocols are extended with additional software components that provide programmatic control and visibility into the network.
The key characteristics of the “augmented” SDN framework model are:
- Existing network devices and protocols are retained, but supplemented with additional software components that expose APIs to the network state and control plane.
- The SDN controller or applications can interact with the routing table and forwarding engine directly through these APIs, without fully replacing the underlying routing protocols.
- This allows for a gradual migration to SDN capabilities, leveraging the investments in existing network infrastructure.
- The “augmented” model provides a middle ground between the “replace” model, which completely replaces the network, and the “hybrid” model, which maintains a separation between the SDN and traditional network control planes.
In the given scenario, the vendor’s SDN solution exposes an API to the Routing Information Base (RIB) and potentially the forwarding engine, allowing off-box processes to interact with the routing table. This is a characteristic of the “augmented” SDN framework, where the existing network functionality is enhanced with programmatic control and visibility.
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