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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

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單項選擇題

While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows "request times out."At which OSI layer is this problem associated with?（）

A. The data link layer
B. The application layer
C. The access layer
D. The session layer
E. The network layer

單項選擇題

You are logged into a router and with to view the layer 3 information about your neighboring Cisco routers. What IOS command gives layer 3 information for of the directly connected router interfaces?（）

A. show ip links
B. show cdp neighbor
C. show cdp neighbor detail
D. show ip clients
E. show ip route
F. None of the above

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