H12-311_V3.0 · Question #246
Which of the following protocols support the 2.4GHz frequency band? (Multiple choice)
The correct answer is B. 802.11b C. 802.11g D. 802.11n. 802.11b, 802.11g, and 802.11n all operate on the 2.4 GHz band - 802.11b introduced it in 1999, 802.11g built on it with faster speeds (54 Mbps), and 802.11n is dual-band, supporting both 2.4 GHz and 5 GHz simultaneously. 802.11a (choice A) is the distractor: it operates…
Question
Which of the following protocols support the 2.4GHz frequency band? (Multiple choice)
Options
- A802.11a
- B802.11b
- C802.11g
- D802.11n
How the community answered
(55 responses)- A29% (16)
- B71% (39)
Explanation
802.11b, 802.11g, and 802.11n all operate on the 2.4 GHz band - 802.11b introduced it in 1999, 802.11g built on it with faster speeds (54 Mbps), and 802.11n is dual-band, supporting both 2.4 GHz and 5 GHz simultaneously. 802.11a (choice A) is the distractor: it operates exclusively on 5 GHz, which gives it less range and less interference but no 2.4 GHz support. A useful memory trick: "a" = apart - 802.11a stands alone on 5 GHz, while b, g, and n all share the 2.4 GHz neighborhood.
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