单选

●网桥是一种常用的网络互联设备，它工作在OSI的 (25) 上，在L

AN中用桥接少量以太网网段时，常用的网桥是&n
bsp;(26) 。从网桥的基本原理可知网桥 (27) ，因此使用网桥有两个显著优点，其一是 (28) ，其二是利用公共通信链路实现两个远程LAN的互联。 (25) A．物理层
B．数据链路层
C．网络层
D．传输层 (26) A．封装网桥
B．源路径选择桥
C．转换桥
D．透明桥 (27) A．无选择地转发数据帧
B．有选择地转发数据帧
C．可将其互联的网络分成多个逻辑子网
D．以地址转换方式实现互联的网络之间的通信 (28) A．能再生和放大信号，以便扩展LAN的长度
B．具有差错检测和流量控制功能
C．适用于复杂的局域网互联
D．可把一个大的LAN分段，以提高网络性能

试题出自试卷《2011年网络管理员考试考前密卷（一）-上午试题》

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