Which of the following statements is false about BFD?
A.
The asynchronous mode is the primary BFD operating mode.
B.
In asynchronous mode, two systems periodically exchange BFD Control packets at the negotiated interval. If one system does not receive any BFD Control packets from the other within the detection interval, the BFD session is declared down.
C.
The asynchronous mode does not support the echo function.
D.
In demand mode, after a BFD session is set up, the system does not periodically send BFD Control packets.
In asynchronous mode, two devices exchange BFD Control packets to monitor connectivity. However, this mode does support the echo function, which tests bidirectional paths by sending packets that loop back to the origin. This statement is incorrect. Demand mode, on the other hand, minimizes the control packet exchange, relying on periodic echo packets if configured. Huawei's BFD configuration guides emphasize these distinctions .
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