220-801 · Question #140
Which of the following network cable types has the longest range?
The correct answer is B. Single-mode fiber. Single-mode fiber optic cable supports the longest transmission distances of any listed cable type, capable of spanning tens of kilometers using a narrow light beam.
Question
Which of the following network cable types has the longest range?
Options
- ACAT5e
- BSingle-mode fiber
- CMulti-mode fiber
- DCAT6
How the community answered
(46 responses)- A2% (1)
- B93% (43)
- D4% (2)
Why each option
Single-mode fiber optic cable supports the longest transmission distances of any listed cable type, capable of spanning tens of kilometers using a narrow light beam.
CAT5e copper cable has a maximum segment length of 100 meters before signal attenuation requires a repeater.
Single-mode fiber uses a very small core diameter (approximately 8-10 microns) that allows only one mode of light to propagate, virtually eliminating modal dispersion and enabling transmission distances of 40 km to over 100 km depending on the transceiver - far exceeding all copper and multi-mode fiber options.
Multi-mode fiber supports longer distances than copper but is limited to approximately 550 meters at 1 Gbps due to modal dispersion in its larger core.
CAT6 copper cable shares the same 100-meter maximum segment distance as CAT5e for standard Ethernet operation.
Concept tested: Single-mode fiber optic transmission distance
Source: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/white_paper_c11-463661.html
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