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单项选择题You are the Cisco Network Designer in Cisco.com. Which statement is correct regarding NBAR and NetFlow?()

A、NBAR examines data in Layers 1 and 4.

B、NBAR examines data in Layers 3 and 4.

C、NetFlow examines data in Layers 3 and 4.

D、NBAR examines data in Layers 2 through 4.

  • B
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