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單項選擇題Which of the following layers of the TCP/IP model most closely corresponds to the network layer of the OSI model?（）

A.Application
B.Internet
C.Transport
D.Network
E.Data Link

1.多項選擇題Which three of the protocols below belong to the application layer?（）

A.ARP
B.HTTPS
C.SMTP
D.CDP
E.TFTP
F.ICMP

2.多項選擇題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

3.單項選擇題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

4.多項選擇題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

5.單項選擇題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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