CompTIA Network+ Practice Test

What is a disadvantage of using a single-mode fiber cable?

1. Lower signal quality over long distances

2. Higher cost due to using laser beams

3. Limited applications in modern networking

4. Short transmission ranges

The correct answer is: Higher cost due to using laser beams

The choice of higher cost due to using laser beams highlights a noteworthy characteristic of single-mode fiber cables. These cables transmit data using laser light, allowing for the transmission of signals over very long distances with minimal loss. However, the technology that facilitates this long-distance transmission is inherently more expensive than the light-emitting diodes (LEDs) used in multi-mode fiber cables. This increased cost is attributed to several factors, including the precision required in manufacturing single-mode fibers and the sophisticated laser transmitters necessary for efficient operation. Additionally, the equipment and connectors compatible with single-mode fibers tend to be more costly. Consequently, while single-mode fiber offers superior performance over long distances, the financial implications can be a significant consideration when planning a network. In contrast, while single-mode fiber is adept at handling distance, it does not have limited applications, nor is it prone to short transmission ranges. The focus on long-range communication means that it can be deployed effectively across various applications, especially where distance is a critical factor. Therefore, the characterization of single-mode fiber's disadvantage primarily revolves around its higher cost due to the advanced technology employed.