Question 560
A controller fails but a switch continues forwarding packets using tables last programmed before the outage. Which separation is demonstrated?
Explanation
Correct Answer
Forwarding hardware can continue matching packets against existing programmed tables even when management-plane connectivity is temporarily lost. New policy or topology changes may not be applied until the controller recovers, depending on the platform. This illustrates separation of control and data functions rather than a universal zero-impact failure claim.
Incorrect Answers
The observed continued delivery implies the switch still has usable local forwarding entries. Removing all state would not explain this behavior.
A powered-off controller cannot forward every user packet in this scenario. The distributed dataplane explains continuity.
Time synchronization cannot replace switching ASICs or forwarding tables. Local dataplane state is responsible.