【名词&注释】
结构化布线(structured cabling system)、子网掩码(subnet mask)、核心作用(key role)、全球经济(global economy)、十进制(decimal system)
[单选题]______now plays a central role in the global economy．
A. Data
B. CPU
C. Information
D. Operation
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举一反三：
[单选题]Flow control is a function that prevents network congestion by ensuring that(66)do not over-whelm(67)with data. There are three commonly used methods for handling network congestion.(68)is used by network devices to temporarily store bursts of excess data in memory until they can be processed.(69)are used by receiving devices to help prevent their buffers from overflowing.(70)is a flow-control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.
A. transmitting devices
B. transmitted devices
C. receiving devices
D. received devices
[单选题]某主机的IP地址为220.117.131.12/21，其子网掩码是(28)。
A. 255.255.248.0
B. 255.255.240.0
C. 255.255.252.0
D. 255.255.255.0
[单选题]E1载波的基本帧由32个子信道组成，其中30个子信道用于传送话音数据，2个子信道( )用于传送控制信令，该基本帧的传送时间为( )。
A. CH0和CH2
B. CHl和CHl5
C. CHl5和CH．16
D. CHO和CHl6
[单选题]结构化布线工程中常采用4对UTP，其对应的I/0信息模块有两种标准，即T568A和 T568B，它们之间的差别只是(37)。
A. “1、2”对线与“3、6”对线位置交换
B. “4、5”对线与“7、8”对线位置交换
C. “1、2”对线与“4、5”对线位置交换
D. “3、6”对线与“7、8”对线位置交换
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