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

2.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

4.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

5.單項選擇題In the context of configuring dial-on-demand routing using ISDN, what is the purpose of the dialer-list command?()

A. to identify valid numbers for incoming calls
B. to define the type of ISDN switch at the central office
C. to specify the list of outgoing phone numbers used by the router
D. to associate a dial configuration with a physical interface
E. to define interesting traffic that will enable the link

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