Troubleshooting Questions CCNA 200-120

Router# show interface s0/0
Serial 0/0/0 is administratively down, line protocol is down
What is the reason that the interface status is “administratively down, line protocol down”?
A. There is no encapsulation type configured.
B. There is a mismatch in encapsulation types.
C. The interface is not receiving any keepalives.
D. The interface has been configured with the shutdown command.
E. The interface needs to be configured as a DTE device.
F. The wrong type of cable is connected to the interface.

Correct Answer: D

Refer to the exhibit. A network administrator configures a new router and enters the copy startup-config
running-config on the router. The network administrator powers down the router and sets it up at a remote
location. When the router starts, it enter the system configuration dialog as shown. What is the cause of the
A. The network administrator failed to save the configuration.
B. The configuration register is set to 0×2100.
C. The boot system flash command is missing from the configuration.
D. The configuration register is set to 0×2102.
E. The router is configured with the boot system startup command.

Correct Answer: A

The “System Configuration Dialog” appears only when no startup configuration file is found. The network
administrator has made a mistake because the command “copy startup-config running-config” will copy the
startup config (which is empty) over the running config (which is configured by the administrator). So everything
configured was deleted.
Note: We can tell the router to ignore the start-up configuration on the next reload by setting the register to
0×2142. This will make the “System Configuration Dialog” appear at the next reload


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