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FSNA Readiness Practice Exam

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Which Ethernet naming defines 10 Gigabit Ethernet over single-mode up to 40 kilometers?
Correct Answer:
10GBASE-ER
Explanation:
Understanding Ethernet naming and reach: the suffix in 10GBASE-ER stands for Extended Reach, indicating 10 Gigabit Ethernet over single-mode fiber with the ability to span up to about 40 kilometers. This makes it the option that fits “single-mode up to 40 kilometers.” Other designs use different media and distances: SR is short-range over multimode fiber (short distance), LX uses long-wavelength single-mode fiber with moderate reach, and T runs over copper twisted pair (not fiber).

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