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
正确答案:B
答案解析:有

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