（ ）实现物理层和数据链路层协议转换。
- A.网桥
- B.路由器
- C.网关
- D.中继器
正确答案及解析
正确答案
解析
网络互连设备有中继器（实现物理层协议转换，在电缆间转换二进制信号）、网桥（实现物理层和数据链路层协议转换）、路由器（实现网络层和以下各层协议转换）、网关（提供从最底层到传输层或以上各层的协议转换）和交换机等。
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