CompTIA Network+ (N10-008) — Question 346

Two new network switches located in different buildings are connected together with single-mode fiber. However, no link exists between the two switches. Which of the following steps should the technician perform FIRST to troubleshoot the issue?

Answer options

• A. Reverse TX/RX on the fiber patch cord at one building.
• B. Replace the fiber patch cords in both buildings.
• C. Clean the fiber patch cord connectors in both buildings.
• D. Connect the fiber patch cord to an OTDR at one building.

Correct answer: A

Explanation

The first step should be to reverse the TX/RX on the fiber patch cord at one building, as this is a common issue that can prevent a link from being established. Simply replacing the patch cords, cleaning the connectors, or using an OTDR may not address the fundamental issue of signal directionality that is often caused by incorrect connections.