300-420 Question 304
Single answerAn enterprise network is using a periodic publication model with its SDN (Software-Defined Networking) controller to distribute network topology updates to edge devices. Which statement accurately describes the behavior of periodic publication in this context?
- A
The SDN controller sends updates to edge devices only when there is a change in the network topology.
- B
The SDN controller sends updates to edge devices at regular, predefined intervals regardless of topology changes.
- C
The SDN controller waits for edge devices to request updates before responding with the latest topology information.
- D
The SDN controller sends updates to edge devices based on a combination of event-driven triggers and periodic intervals.
Show answer and explanation
Correct answer: B
Explanation
Periodic publication in SDN involves distributing updates at fixed, predefined intervals to ensure devices have the latest information, even if there are no changes in the network. This is different from event-driven or request-response models, which rely on triggers or device requests. Option 2 accurately describes the nature of periodic publication.
- A. Incorrect.
Incorrect: This describes an event-driven publication model, not a periodic publication model, where updates are sent only on changes in the topology.
- B. Correct.
Correct: A periodic publication model operates by sending updates at regular intervals, regardless of whether the topology has changed or not.
- C. Incorrect.
Incorrect: This describes a request-response model, where updates are provided only when the edge devices request them, which is not periodic publication.
- D. Incorrect.
Incorrect: This describes a hybrid model that combines event-driven and periodic updates, but it is not purely periodic publication.