100-140 Question 123
Single answerA user reports that their desktop computer is not connecting to the network. Upon inspecting the Ethernet port on the back of the computer, you notice that the link light is off. Based on this observation, what could be the most likely cause of the issue?
- A
The Ethernet cable is unplugged or damaged.
- B
The computer's NIC (Network Interface Card) is functioning correctly.
- C
The network switch port is misconfigured or disabled.
- D
The operating system's network adapter driver is up-to-date.
Show answer and explanation
Correct answer: A
Explanation
The link light on an Ethernet port is a key device status indicator that shows whether the physical connection is active. If the light is off, it suggests a problem with the physical connection, such as an unplugged or damaged cable. Addressing this issue should be the first step in troubleshooting.
- A. Correct.
An unlit link light typically indicates that the physical connection is broken, which is often caused by an unplugged or damaged Ethernet cable. This makes it the most likely cause of the issue.
- B. Incorrect.
If the NIC is functioning correctly, the link light would likely be on, assuming the cable and switch are in working condition. Thus, this option is incorrect.
- C. Incorrect.
While a misconfigured or disabled switch port could cause network issues, it would not typically result in the link light being off. Therefore, this option is less likely.
- D. Incorrect.
Driver issues might cause network problems, but they do not typically affect the link light on the Ethernet port. Hence, this option is incorrect.