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單項選擇題

A TestKing.com technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the show cdp neighbors command.
In which OSI layer is the problem most likely occurring?（）

A. Physical
B. Data link
C. Network layer
D. Transport layer
E. Application layer

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單項選擇題

Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data?（）

A.Application
B.Presentation
C.Session
D.Transport
E.Network
F.Data-Link

單項選擇題

You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation?（）

A. Application
B. Presentation
C. Session
D. Transport
E. Internet
F. Data Link
G. Physical