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
A. Application
B. Presentation
C. Session
D. Transport
E. Internet
F. Data Link
G. Physical
A. The data link layer
B. The application layer
C. The access layer
D. The session layer
E. The network layer
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
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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