多项选择题
A.ARP B.HTTPS C.SMTP D.CDP E.TFTP F.ICMP
Which three of the following OSI model layers also belo...
多项选择题Which three of the following OSI model layers also belong to the TCP/IP model?（）
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
