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


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1.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

2.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

3.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

4.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

5.多項選擇題In the communications industry, what are the features and benefits of using the layered OSI model?（）

A. It encourages industry standardization by defining what functions occur at each layer of the model.
B. It necessitates changes in functionality in one layer to other layers.
C. It enables equipment efficiency from different vendors to use the same electronic components.
D. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
E. It supports the evolution of multiple competing standards, and thus enhances business equipment manufacturing opportunities.