CompTIA Network+ (N10-007) — Question 211

A technician is troubleshooting a point-to-point fiber-optic connection. The technician is at a remote site and has no connectivity to the main site. The technician confirms the switch and the send-and-receive light levels are within acceptable range. Both fiber SFPs are confirmed as working. Which of the following should the technician use to reveal the location of the fault?

Answer options

• A. OTDR
• B. Light meter
• C. Tone generator
• D. CSU/DSU

Correct answer: A

Explanation

The correct tool to identify the location of a fault in a fiber-optic connection is an OTDR (Optical Time-Domain Reflectometer), as it can provide precise information about the location and nature of faults within the fiber. A light meter measures light levels but does not pinpoint faults, a tone generator is used for copper cabling, and a CSU/DSU is meant for connecting digital circuits, not for fiber diagnostics.