题目内容

网络安全控制的主要工作不含 (54) 。

A. 定期关闭网络
B. 查找并消除病毒
C. 管理局域网外部权限和连接
D. 管理用户注册和访问权限

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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.

A. loop
B. find
C. search
D. query

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。

A. 价格
B. 重量
C. 性能
D. 网络规模

计算机网络布线系统可分为 (65) 两大子系统.

A. 布线配线子系统、户外子系统
B. 户外子系统、户内子系统
C. 布线配线子系统、平面楼层子系统
D. 平面楼层子系统、户内子系统

<base>标记的属性target=“_blank”表示 (51) 。

A. 在屏幕上出现一行空格
B. 被链接的文件内插入一个空格
C. 被链接的文件放在一个预先设定的窗,中
D. 被链接的文件放在一个未预先设定的窗口中

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