H12-311_V3.0 · Question #58
Which of the following rates is not supported by the 802.11a protocol?
The correct answer is D. 30Mbps. 30 Mbps is not a valid data rate in the 802.11a standard. The 802.11a protocol, which operates in the 5 GHz band using OFDM modulation, defines a specific set of supported rates: 6, 9, 12, 18, 24, 36, 48, and 54 Mbps. Options A (6 Mbps), B (12 Mbps), and C (24 Mbps) are all…
Question
Which of the following rates is not supported by the 802.11a protocol?
Options
- A6Mbps
- B12Mbps
- C24Mbps
- D30Mbps
How the community answered
(48 responses)- A8% (4)
- B4% (2)
- C17% (8)
- D71% (34)
Explanation
30 Mbps is not a valid data rate in the 802.11a standard. The 802.11a protocol, which operates in the 5 GHz band using OFDM modulation, defines a specific set of supported rates: 6, 9, 12, 18, 24, 36, 48, and 54 Mbps. Options A (6 Mbps), B (12 Mbps), and C (24 Mbps) are all legitimate members of this set, which is why they are incorrect choices for this question. The number 30 simply does not appear in the 802.11a rate table.
Memory tip: Learn the 802.11a rates as the sequence 6, 9, 12, 18, 24, 36, 48, 54 - notice they roughly double in groups and never include 30. If you see 30 Mbps on an exam, it is always a distractor.
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