The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs a

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问题 The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72)control functions.In(73)data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74)by the primary station, interprets received commands and (75) responses to be transmitted.

选项 A、produces
B、creates
C、generates
D、makes

答案C

解析 数据站通常指一种功能单元,它为传输提供数据,接受发送来的数据,并完成与另一功能单元进行通信所必需的全部功能。从控制功能的角度来看,数据站分为初级站和次级站两种。在高级数据链路控制中,初级站是支持对数据链路的初级控制功能,生成要发送的命令,并判读收到的响应的数据站。分派给初级站的具体职责包括:对控制信号交换加以初始化,对数据流进行组织,以及就差错控制与出错排除采取动作。次级站按初级站的指令执行数据链路控制功能,判读收到的命令,并生成要发送的响应。
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