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单项选择题Which statement is correct regarding NBAR and NetFlow?()

A、NetFlow uses five key fields for the flow

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

E、NetFlow examines data in Layers 2 through 4

  • B
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