In the OSI model, at which layers do WANs operate at?（）
- A、Applicationlayer
- B、Presentationlayer
- C、Sessionlayer
- D、Transportlayer
- E、Networklayer
- F、Datalinklayer
- G、Physicallayer
正确答案:F,G
答案解析:有
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In the OSI model, at which layers do WANs operate at?（）
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