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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