单选题Which one of the following is the most commonly used layer 2 network device?（）AHubBBridgeCSwitchDRouterERepeatersFNone of the above
单选题
Which one of the following is the most commonly used layer 2 network device?（）
A
Hub
B
Bridge
C
Switch
D
Router
E
Repeaters
F
None of the above
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