220-801 · Question #577
Which of the following wireless protocols c range ONLY?
The correct answer is A. 802.11a. IEEE 802.11a operates exclusively in the 5 GHz frequency band, unlike 802.11b and 802.11g which use 2.4 GHz.
Question
Which of the following wireless protocols c range ONLY?
Options
- A802.11a
- B802.11b
- C802.11g
- D802.11n
How the community answered
(38 responses)- A89% (34)
- B3% (1)
- C3% (1)
- D5% (2)
Why each option
IEEE 802.11a operates exclusively in the 5 GHz frequency band, unlike 802.11b and 802.11g which use 2.4 GHz.
802.11a was ratified in 1999 and is the only single-band standard among the listed options that operates solely at 5 GHz, offering up to 54 Mbps. Because it uses 5 GHz exclusively, it avoids the congestion common at 2.4 GHz but has shorter range due to higher frequency attenuation. This makes it the correct answer when the question asks about a protocol limited to one specific frequency range.
802.11b operates exclusively at 2.4 GHz, not 5 GHz.
802.11g also operates at 2.4 GHz and is backward-compatible with 802.11b.
802.11n is a dual-band standard capable of operating at both 2.4 GHz and 5 GHz simultaneously.
Concept tested: IEEE 802.11a 5 GHz exclusive frequency band
Source: https://standards.ieee.org/ieee/802.11a/1040/
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