Best cable type for 150m network closet connection?

A network administrator needs to connect two network closets that are 492ft (150m) away from each other. Which of the following cable types should the administrator install between the closets?

  1. Single-mode fiber Source Reference Answer
  2. Coaxial
  3. DAC
  4. STP

Community Votes

A
100%

100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

This question tests the 100-meter distance limitation of twisted pair copper versus the range of fiber optics, where the trap is selecting a copper cable type like STP despite the excessive length.

Single-mode fiber is the required solution for connecting network closets 150 meters apart, as copper cabling is strictly limited to 100 meters. The community consensus confirms fiber is necessary to prevent signal loss over this distance.

Choosing STP (Shielded Twisted Pair) is the most frequent error, as test-takers often focus on the shielding benefits while overlooking the absolute 328ft (100m) distance restriction for Ethernet over copper.

Community Discussion (3 comments)

Abx_01 👍 1 Selected: A
Fiber is good for long distance. Direct Attach Copper (DAC) cable is ideal for short-range connections, typically up to 7 meters.
HeatSquad77 👍 1 Selected: A
A. Single-mode fiber. Explanation: To connect two network closets that are 492 feet (150 meters) apart, the key consideration is the distance and the type of cable that can effectively handle that distance without significant signal loss or degradation
SuntzuLegacy 👍 3 Selected: A
The correct answer is: A. Single-mode fiber Explanation: At a distance of 492 feet (150 meters), single-mode fiber is the best choice for connecting network closets. Single-mode fiber is designed for long-distance transmission and provides high bandwidth with minimal signal loss over distances far exceeding the 150 meters required in this scenario.

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Expert Analysis

Why the Answer Is Correct

Single-mode fiber is designed for long-distance data transmission, supporting ranges up to several kilometers. At 150 meters, it provides a reliable, high-bandwidth connection without the signal degradation inherent in copper cables at this length.

Why the Other Options Are Wrong

STP (D) is incorrect because twisted pair copper has a hard limit of 100 meters (328ft) due to attenuation and delay skew. DAC (C) is meant for very short connections, typically under 7 meters inside a rack. Coaxial (B) is generally obsolete for modern Ethernet backbones and is not the standard choice for closet-to-closet uplinks.

Community Comment Notes

Comments emphasize that fiber is the standard for long-distance runs, explicitly contrasting it with DAC which is limited to short ranges (up to 7m). The community agrees that the 150-meter distance immediately rules out copper-based solutions.

Official Reference

Exam Strategy

Memorize the 100-meter (328ft) distance limit for twisted-pair copper cabling. If an exam question specifies a distance greater than 100 meters, you can immediately eliminate all copper options and select the fiber alternative.

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