单选题:在路由器互联的多个局域网中,通常要求每个局域网的(  )。

题目内容:
在路由器互联的多个局域网中,通常要求每个局域网的(  )。 A.数据链路层协议和物理层协议必须相同
B.数据链路层协议必须相同.而物理层协议可以不同
C.数据链路层协议可以不同.而物理层协议必须相同
D.数据链路层协议和物理层协议可以都不相同

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