题目内容：
A. HubB. Bridge
C. Switch
D. Router
E. Repeaters
F. None of the above
参考答案：
选择题：Which one of the following is the most commonly used layer 2 network device?()
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根据芽的位置可将芽分为()、()、()。
根据芽的位置可将芽分为()、()、()。
Refer to the exhibit. IP multicast configuration changes have been made on several routers
Refer to the exhibit. IP multicast configuration changes have been made on several routers
简述造林树种选择的原则。
简述造林树种选择的原则。
In the OSI model, at which layers do WANs operate at?()
In the OSI model, at which layers do WANs operate at?()
At which layer of the OSI model is the optimal path to a network destination determined at?()
At which layer of the OSI model is the optimal path to a network destination determined at?()