SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietio

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问题 SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the(71)protocol called NRM is essentially the same as SDLC.
SDLC is(72)protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of(73)that controls all communications, and(74).It is capable of(75).operation, but almost all practical applications are strictly half duplex.

选项 A、a primary station
B、one or more primary stations
C、a secondary station
D、one or more secondary stations

答案D

解析

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网络工程师上午基础知识考试

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