早期的网桥、协议转换器和路由器都是简单的专用硬件设备，通常是通过直接连接到该设备本身串口的终端来配置的。
Early network Bridges, protocol converters, and routers were simple dedicated hardware units typically configured through a terminal directly connected to a serial port on the unit itself.
另一个选择是设置系统，以将其中一个网络设备作为通向服务器外部网的网桥。
The other option is to set up the system so that one of the network devices ACTS as a bridge to the server external network.
网桥可以拒绝服务并且丢弃数据包，以阻止未授权设备对网络的访问。
Bridge may deny service and discard frames to prevent network access by unauthorized devices.
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