The X.25 standard specifies three layers of functionality.Which layers of the OS
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 Layers
B．the Physical, Data Link, and Network Layers
C．the Physical, Data Link, and Transport Layers
D．the Physical, Session, and Presentation layers
正确答案：B
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