H12-311_V3.0 · Question #13
Which of the following protocols can support both the 2.4GHz frequency band and the 5GHz frequency band?
The correct answer is D. 802.11n. 802.11n (Wi-Fi 4), introduced in 2009, was the first Wi-Fi standard designed to operate on both the 2.4GHz and 5GHz frequency bands, making it a dual-band protocol. 802.11a operates exclusively on 5GHz, while 802.11b and 802.11g are limited to 2.4GHz only - none of the three…
Question
Which of the following protocols can support both the 2.4GHz frequency band and the 5GHz frequency band?
Options
- A802.11a
- B802.11b
- C802.11g
- D802.11n
How the community answered
(53 responses)- A13% (7)
- B8% (4)
- C4% (2)
- D75% (40)
Explanation
802.11n (Wi-Fi 4), introduced in 2009, was the first Wi-Fi standard designed to operate on both the 2.4GHz and 5GHz frequency bands, making it a dual-band protocol. 802.11a operates exclusively on 5GHz, while 802.11b and 802.11g are limited to 2.4GHz only - none of the three can span both bands. The dual-band capability of 802.11n also brought significant speed improvements through MIMO (Multiple Input Multiple Output) antenna technology.
Memory tip: Think of "n" as standing for "new and notable" - 802.11n was the notable leap forward that introduced dual-band support, setting the stage for all modern Wi-Fi standards that followed.
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