COMPTIA A+ Practice Exam

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What color is SINGLE MODE FIBER?

Blue
Orange
Yellow
Green

The correct answer is: Yellow

Single mode fiber is commonly represented by the color yellow. This color coding helps technicians easily identify the type of fiber cable used in networking and telecommunications. Yellow single mode fiber has a core that allows only one mode of light to propagate, which is ideal for long-distance communication. The other colors listed correspond to different types of fiber optics: blue typically indicates a specific type of multimode fiber, and orange represents another variant of multimode fiber. Green may sometimes indicate high-performance multimode fiber or specialty fibers but does not typically indicate single mode fiber. Understanding these color codes is important for anyone working with fiber optic cabling in order to ensure proper installation and maintenance.