300-420 Question 308
Single answerAn organization has implemented a controller-based network using Cisco SDN architecture. They want to optimize the network's performance by only notifying subscribed clients when a configuration change occurs, rather than sending periodic updates. Which feature of on-change publication should the organization leverage to achieve this behavior?
- A
Event-driven notifications
- B
Polling-based updates
- C
Time-based updates
- D
State synchronization
Show answer and explanation
Correct answer: A
Explanation
On-change publication is designed to notify subscribers only when specific changes occur in the network state, rather than sending updates at regular intervals or based on client polling. This is achieved through event-driven notifications, which improve network performance and scalability by reducing unnecessary updates.
- A. Correct.
Event-driven notifications are the core of on-change publication, where updates are sent only when a specific event or change occurs, reducing unnecessary communication and improving efficiency.
- B. Incorrect.
Polling-based updates involve clients periodically requesting updates, which contradicts the on-change publication model. This approach is less efficient and not relevant to the scenario.
- C. Incorrect.
Time-based updates send updates at regular intervals regardless of changes, which does not align with the on-change publication methodology described in the question.
- D. Incorrect.
State synchronization refers to the process of aligning the client and server states but does not directly pertain to the on-change publication mechanism.