单项选择题

VLAN tag在OSI参考模型的哪一层？（）

A.应用层
B.表示层
C.会话层
D.传输层
E.网络层
F.链路层
G.物理层

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While troubleshooting a network connectivity problem, a...

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B.It is used to route between autonomous systems.
C.It confines network instability to one area of the network.
D.It increases routing overhead on the network.
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CCNA系列认证综合练习

VLAN tag在OSI参考模型的哪一层？（）