在局域网中，划分广播域的边界是（ ）。
- A.HUB
- B.Modem
- C.VLAN
- D.交换机
正确答案及解析
正确答案
解析
本题考查网络设备的基本知识。
HUB 也叫集线器，是一种总线型的网络连接设备，工作于 OSI 模型的物理层，使用集线器所连接的网络拓扑为总线型网络，它是一个广播域，同时也是冲突域。
Modem是调制解调器，主要为实现在传统模拟线路上传输数字信号的一种设备。
VLAN 是一种通过逻辑地在交换机上根据一定的规则分隔广播数据包的方式，通过为进入交换机的数据帧标记不同的 vlan tag，只有带有与接口相同的vlan tag 的数据帧才能够被转发和通信。
交换机在默认情况下，所有的接口均处于同一个广播域中，因此它不具备划分广播域边界的功能。
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