The administrator is unable to establish connectivity between two Cisco routers. Upon reviewing the command output of both routers, what is the most likely caust of the problem?（）A、Authentication needs to be changed to PAP for both routers.B、Serial IP addresses of routers are not on the same subnet.C、Username/password is incorrectly configured.D、Router names are incorrectly configured.
The administrator is unable to establish connectivity between two Cisco routers. Upon reviewing the command output of both routers, what is the most likely caust of the problem?（）
- A、Authentication needs to be changed to PAP for both routers.
- B、Serial IP addresses of routers are not on the same subnet.
- C、Username/password is incorrectly configured.
- D、Router names are incorrectly configured.
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