The output of the show ip interface brief command on R1 lists interface status codes of “down” and “down” for interface GigabitEthernet 0/0. The interface connects to a LAN switch with a UTP straight-through cable. Which of the following could be true?

The output of the show ip interface brief command on R1 lists interface status codes of “down” and “down” for interface GigabitEthernet 0/0. The interface connects to a LAN switch with a UTP straight-through cable. Which of the following could be true?

• The shutdown command is currently configured for router interface G0/0.
• The shutdown command is currently configured for the switch interface on the other end of the cable.
• The router was never configured with an ip address command on the interface.
• The router was configured with the no ip address command.

Explanation: If the first of the two status codes is “down,” it typically means that a Layer 1 problem exists. In this case, the question states that the router connects to a switch with a UTP straight-through cable, which is the correct cable pinout. Of the two answers that mention the shutdown command, if the router interface were shut down, the first router status code would be “administratively down,” so that answer is incorrect. However, if the neighboring device interface sits in a shutdown state, the router will sense no electrical signals over the cable, seeing that as a physical problem, and place the interface into a “down/down” state, making that answer correct.
Second, the two answers that mention interface IP addresses have no impact on the status codes of the show interfaces brief command. Both answers imply that the interface does not have an IP address configured. However, both the first and second status codes are not related to whether IP addresses have been configured or not, making both answers incorrect.