At which layers of the OSI model do WANs operate (Choose two.)()。 A.application layerB.session layerC.transport layerD.network layerE.datalink layerF.physical layer
At which layers of the OSI model do WANs operate (Choose two.)()。
A.application layer
B.session layer
C.transport layer
D.network layer
E.datalink layer
F.physical layer
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