[单选] 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.

CPU CASE 根据不同文化在文化系统中的地位和作用，可以把文化分为（）主流文化、亚文化、反文化。科技、规范、语言、价值。文化元素、文化丛、文化模式。文化区、文化区域、文化圈和边际文化。 Refer to the exhibit. Assume Router A is configured for split tunneling. If the Internet Service provider was asked by the customer to provide a guarantee of at least 60 percent of the WAN link between Router A and Router C for encrypted traffic, what would be the best means of identifying this traffic to their QoS Service Policy?（） permit esp any permit udp any eq 500 any eq 500。 permit udp any eq isakmp any eq isakmp。 permit ip 10.81.7.0 0.0.0.7 any。 tcp any any eq 22。相平衡 What protection method is used in 4F BLSR networks?（）

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

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