问题
单项选择题
LANs can be connected by using bridges, which operate in the ( )。
A． physical layer
B． data link layer
C． network layer
D． transport layer
答案
参考答案：B
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LANs can be connected by using bridges, which operate in the ( )。
A． physical layer
B． data link layer
C． network layer
D． transport layer
参考答案：B
