H12-311_V3.0 · Question #37
Which technology is used to implement the 802.11a protocol?
The correct answer is C. OFDM. 802.11a operates in the 5 GHz band and uses OFDM (Orthogonal Frequency Division Multiplexing), which splits the signal across multiple subcarriers to achieve speeds up to 54 Mbps and better resistance to multipath interference. FHSS (Frequency Hopping Spread Spectrum) was used…
Question
Which technology is used to implement the 802.11a protocol?
Options
- AFHSS
- BDSSS
- COFDM
- DMIMO
How the community answered
(22 responses)- A14% (3)
- B5% (1)
- C77% (17)
- D5% (1)
Explanation
802.11a operates in the 5 GHz band and uses OFDM (Orthogonal Frequency Division Multiplexing), which splits the signal across multiple subcarriers to achieve speeds up to 54 Mbps and better resistance to multipath interference. FHSS (Frequency Hopping Spread Spectrum) was used in the original 802.11 standard from 1997 and is not associated with 802.11a. DSSS (Direct Sequence Spread Spectrum) is the technology behind 802.11b, not 802.11a. MIMO (Multiple Input Multiple Output) came later with 802.11n, using multiple antennas to boost throughput well beyond what 802.11a supports.
Memory tip: Remember "A uses OFDM" by pairing them alphabetically - both appear together in 802.11a and 802.11g, while 802.11b stands alone with DSSS.
Topics
Community Discussion
No community discussion yet for this question.