CompTIA Network+ (N10-007) — Question 41

A department is reporting network issues. Users can ping each other and the switch, but not the default gateway. When looking at a wiring diagram and a physical blueprint, a technician notices the 1000BaseLX SFP connects to a distribution switch via a cable that runs behind a large industrial refrigerator. The technician also notices both switches have been worked on recently. Which of the following is MOST likely the issue?

Answer options

• A. EMI
• B. TX/RX reverse
• C. Open/short
• D. Attenuation

Correct answer: B

Explanation

The most likely cause of the issue is TX/RX reverse, which occurs when the transmit and receive pairs are incorrectly configured, preventing communication with the gateway. The other options such as EMI, Open/short, and Attenuation are less likely since users can still ping each other and the switch, indicating that the cable is functional but misconfigured.