H12-311_V3.0 · Question #52
802.11b is a protocol based on Orthogonal Frequency Division Multiplexing (OFDM for short) technology.
The correct answer is B. False. Option B is correct because 802.11b does not use OFDM; it relies on Direct Sequence Spread Spectrum (DSSS) technology and operates on the 2.4 GHz band with a maximum throughput of 11 Mbps. OFDM is the modulation technique associated with 802.11a (5 GHz, up to 54 Mbps) and…
Question
802.11b is a protocol based on Orthogonal Frequency Division Multiplexing (OFDM for short) technology.
Options
- ATrue
- BFalse
How the community answered
(26 responses)- A15% (4)
- B85% (22)
Explanation
Option B is correct because 802.11b does not use OFDM; it relies on Direct Sequence Spread Spectrum (DSSS) technology and operates on the 2.4 GHz band with a maximum throughput of 11 Mbps. OFDM is the modulation technique associated with 802.11a (5 GHz, up to 54 Mbps) and 802.11g (2.4 GHz, up to 54 Mbps), both of which came after 802.11b. Option A is wrong because it incorrectly attributes OFDM to 802.11b, conflating it with later standards that actually introduced OFDM to the 802.11 family.
Memory tip: Think of the letter "b" as standing for "basic" or "before OFDM" - 802.11b was the older, simpler standard using DSSS, while the standards that came after it (a and g) brought in the more advanced OFDM technology.
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