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At which of the following layers does the UDP protocol operate?（）
- A、Layer 1
- B、Layer 4
- C、Layer 6
- D、Layer 7
参考答案
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In the OSI model, which of the following layers would be the cause of a session time－out while browsing the web?()
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Which three of the following OSI model layers also belong to the TCP／IP model?()
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单选题Which statement is correct regarding NBAR and NetFlow？（）A
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单选题Which of the following layers is associated with the physical hardware address of a network node?（）A
Layer 1B
Layer 2C
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单选题Which of the following OSI model layers is used for logical addressing?（）A
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