题目内容
设某单总线LAN，总线长度为1000m，数据率为10Mb/s，数字信号在总线上的传输速度为2C/3(C为光速)，则每个信号占据的介质长度为 (47) m。当采用CSMA/CD (非噩EE用802.3标准)访问方式时，如只考虑数据帧而忽略其他一切因素，则最小时间片的长度为 (48) μs，最小帧长度是 (49) 位。
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网络安全控制的主要工作不含 (54) 。
IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.
用户布线时，究竟采用光缆还是铜缆， (64) 不是主要考虑的因素。
计算机网络布线系统可分为 (65) 两大子系统．
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