Anypoint MQ circuit breaker closed state begins in which condition?

• A. It begins in Open.
• B. It starts in Half-Open.
• C. It remains in Open.
• D. It starts in Closed state where it retrieves messages normally.

Answer: (D)

Startup behavior of the circuit breaker follows the classic tri-state pattern: Closed, Open, and Half-Open. When Anypoint MQ starts up, the breaker is in the Closed state, meaning everything is allowed to flow as usual and messages are retrieved normally. The idea is to fail fast only after faults are detected. If failures accumulate, the breaker moves to Open to block calls, then after a timeout it goes to Half-Open to test with a limited load, and if those tests pass it returns to Closed. So the initial condition is the Closed state where message retrieval happens normally.