N10-005 · Question #820
Which of the following can assist when troubleshooting a cable that meets the 1000BaseLX specification?
The correct answer is B. OTDR. 1000BaseLX uses fiber optic cabling, so an OTDR is the appropriate tool for locating faults, measuring signal loss, and characterizing the fiber segment.
Question
Which of the following can assist when troubleshooting a cable that meets the 1000BaseLX specification?
Options
- AMultimeter
- BOTDR
- CLink state
- DProtocol analyzer
How the community answered
(42 responses)- A2% (1)
- B93% (39)
- C5% (2)
Why each option
1000BaseLX uses fiber optic cabling, so an OTDR is the appropriate tool for locating faults, measuring signal loss, and characterizing the fiber segment.
A multimeter measures electrical properties such as voltage, current, and resistance, making it useful only for copper cable testing - not fiber optic media.
An OTDR (Optical Time Domain Reflectometer) sends light pulses into a fiber optic cable and measures reflections to locate breaks, splices, and signal attenuation. Because 1000BaseLX is a long-wavelength fiber optic standard, the OTDR is the correct specialized instrument for diagnosing its physical medium.
Link state is a routing protocol concept (as in OSPF link-state advertisements) and is not a physical layer cable troubleshooting tool.
A protocol analyzer captures and decodes network traffic at higher OSI layers and cannot assess the physical integrity of a fiber optic cable.
Concept tested: OTDR use for fiber optic cable troubleshooting
Source: https://www.cisco.com/c/en/us/support/docs/interfaces-modules/gbic-sfp-cwdm-dwdm-xenpak-x2/200378-Optical-Power-Testing-for-Fiber-Optic-Ca.html
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