At which layers of the OSI model do WANs operate?（）A、application layerB、session layerC、transport layerD、network layerE、datalink layerF、physical layer
At which layers of the OSI model do WANs operate?（）
- A、application layer
- B、session layer
- C、transport layer
- D、network layer
- E、datalink layer
- F、physical layer
相关考题：
The X.25 standard specifies three layers of functionality.Which layers of the OSI model correspond to the X.25 layers?A．the Physical, Network, and Session LayersB．the Physical, Data Link, and Network LayersC．the Physical, Data Link, and Transport LayersD．the Physical, Session, and Presentation layers
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