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TCP/IP communication protocol contains four layers. From bottom to top, the four layers are ( ).
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B.internet layer, network interface layer, transport layer and application layer
C.network interface layer, transport layer, network interface layer and application layer
D.application layer, transport layer, internet layer and network interface layer
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ATM (Asynchronous Transfer Mode) technology combines connection oriented mechanism and () mechanism.
A.circuit switching
B.packet switching
C.message switching
D.voice switching