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．

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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

参考答案和解析

正确答案：B

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