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單項(xiàng)選擇題

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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多項(xiàng)選擇題

In the OSI model, at which layers do WANs operate at?（）

A.Applicationlayer
B.Presentationlayer
C.Sessionlayer
D.Transportlayer
E.Networklayer
F.Datalinklayer
G.Physicallayer

單項(xiàng)選擇題

At which layer of the OSI model is the optimal path to a network destination determined at?（）

A. Data Link
B. Session
C. Physical
D. Presentation
E. Network
F. Transport

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