网络路由器（ ）。
- A.可以连接不同的子网
- B.主要用于局域网接入I n t e r n e t
- C.主要起分隔网段的作用
- D.工作在数据链路层
正确答案及解析
正确答案
解析
路由器有多个端口，用于连接多个IP子网。每个端口的IP地址的网络号要求与所连接的IP子网的网络号相同。不同的端口为不同的网络号，对应不同的IP子网。路由器转发IP分组时，只根据IP目的IP地址的网络部分，选择合适的端口，把ip分组送出去。同主机一样，路由器也要判定端口所接的是否是目的子网，如果是，就直接把分组通过端口送到网络上；否则，也要选择下一个路由器来传送分组。
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