A network operations engineer is documenting the architectural changes associated with migrating an enterprise infrastructure from a traditional distributed routing model to a software-defined controller-based network architecture. Which of the following statements correctly describe operational or structural differences introduced by controller-based networking? (Select TWO.)
- Control plane intelligence is centralized within the software controller, relieving individual underlying network devices from calculating global topology maps independently.Answer
- BPuppet and Chef deploy agentless SSH connections managed directly by the SDN controller to provision Northbound REST interfaces on network devices.
- Southbound APIs enable the centralized controller to dynamically communicate with and program forwarding behaviors on network infrastructure devices.Answer
- DNorthbound REST API calls rely primarily on HTTP POST requests to retrieve and read network telemetry metrics without altering system configuration state.
Answer
The correct statements are that control plane intelligence is centralized within the software controller to relieve individual devices from computing global topology maps independently, and that Southbound APIs enable the controller to dynamically program network infrastructure devices.
In controller-based networking, the centralized controller aggregates control plane logic, freeing individual routers and switches from executing distributed control algorithms individually. To push changes down to the infrastructure layer, the controller uses Southbound protocols and APIs (such as OpenFlow, NETCONF, or RESTCONF).
Step-by-Step Solution
Key Concept
Centralized vs. Distributed Control Planes & SDN Interfaces (Southbound vs Northbound)
Estimated Time:1m 30s