010-151 · Question #67
The Ethernet specification details several different fiber optic media types. What is the wire transmission speed for 100BASE-FX Ethernet?
The correct answer is B. 100 Mb/s. The numeric prefix in Ethernet naming directly encodes the transmission speed in Mb/s, so 100BASE-FX operates at 100 Mb/s over fiber optic media.
Question
The Ethernet specification details several different fiber optic media types. What is the wire transmission speed for 100BASE-FX Ethernet?
Options
- A10 Mb/s
- B100 Mb/s
- C1000 Mb/s
- D10000 Mb/s
How the community answered
(53 responses)- A6% (3)
- B81% (43)
- C4% (2)
- D9% (5)
Why each option
The numeric prefix in Ethernet naming directly encodes the transmission speed in Mb/s, so 100BASE-FX operates at 100 Mb/s over fiber optic media.
10 Mb/s is the speed of the original Ethernet standards such as 10BASE-T and 10BASE-FL, not the Fast Ethernet 100BASE-FX specification.
IEEE 802.3 Fast Ethernet naming conventions encode speed as the leading number in megabits per second. 100BASE-FX specifies 100 Mb/s baseband signaling, where 'BASE' indicates baseband transmission and 'FX' designates fiber optic media. This standard was ratified as part of IEEE 802.3u and remains the definitive speed classification for this media type.
1000 Mb/s corresponds to the Gigabit Ethernet family (e.g., 1000BASE-SX, 1000BASE-LX), which uses a '1000' prefix, not '100'.
10000 Mb/s corresponds to the 10 Gigabit Ethernet family (e.g., 10GBASE-SR), which is a completely separate IEEE 802.3ae standard.
Concept tested: 100BASE-FX Fast Ethernet fiber optic speed classification
Source: https://standards.ieee.org/ieee/802.3u/1162/
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