多项选择题
Which three of the protocols below belong to the application layer?（）
A.ARP
B.HTTPS
C.SMTP
D.CDP
E.TFTP
F.ICMP
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相关考题
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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 -
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 -
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
