问题

What protection method is used in 4F B

What protection method is used in 4F BLSR networks?（）

A Each fiber has half of its SONET capacity reserved for protection.
B Two fibers in the span carry working traffic, while the other two fibers in the span are reserved for protection.
C The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.
D The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.

参考答案

参考解析：

分类：CCNP(642-311)题库

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