How would you answer an interview scenario involving circuit breaker pattern?

In an interview, I would first define circuit breaker pattern and the problem it solves, then explain how I would combine the breaker with sensible timeouts, use failure thresholds based on real behavior, define fallback expectations, instrument state transitions, and avoid retry storms around the protected dependency. I would also call out the main failure mode: using a circuit breaker without timeouts or with thresholds that ignore normal traffic patterns can either fail too slowly or open unnecessarily. Finally, I would describe how I would test, monitor, and safely roll back or recover the solution.