多项选择题
A. The application layer B. The session layer C. The data link layer D. The transport layer E. The network interface layer F. The physical layer
Which one of the following is the most commonly used la...
单项选择题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
In the OSI model, at which layers do WANs operate at?（）...
多项选择题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
At which layer of the OSI model is the optimal path to ...
单项选择题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
