10.4 WAN Troubleshooting

Question 1

router#show interfaces

Answer 1

Lists a large set of information about each interface.

Question 2

router#show interface status

Answer 2

Displays summary information about the interface status.

Question 3

router#show ip interfaces

Answer 3

Displays a small set of information about each IP interface.

Question 4

router#show ip interfaces brief

Answer 4

Displays a single line of information about each IP interface.

Question 5

router#show ip route [ip address]

Answer 5

Displays details about the route a packet takes to reach the specified IP address.

Question 6

router#show running-config

Answer 6

Displays the currently running configuration file.

Question 7

router#show controllers [serial interface]

Answer 7

Displays the serial interface configuration, such as the type of serial cable and whether the DCE or DTE end of the cable is connected to the device.

Question 8

router#ping [ip address]

Answer 8

Tests communication with a specific interface, using its IP address.

Question 9

Line status - administratively down

Protocol status - down

Answer 9

The interface was configured with the shutdown command.

Question 10

Line status - down

Protocol status - down

Answer 10

There is a hardware or network connection problem (Physical layer), such as:
No cable or bad cable.
A powered off device or administratively shut down interface on the other end of the cable.

Question 11

Line status - up

Protocol status - down

Answer 11

There is a connection or communication problem (Data Link layer), such as:
No clock rate provided by the DCE device.
Mismatched encapsulation.
Incorrect authentication parameters for PPP, including:
Mismatched authentication method
Missing username statements
Mismatched passwords

Question 12

Line status - up

Protocol status - up

Answer 12

The interface is working correctly.