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Which of the following statements about BFD operating modes are true?

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Which of the following statements about BFD operating modes are true?

A.

In demand mode, once a BFD session is set up, the system no longer periodically sends BFD Control packets.

B.

Asynchronous mode does not support the Echo function.

C.

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 time, the BFD session is declared down.

D.

Asynchronous mode is the primary BFD operating mode.

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