单选题
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 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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