312-50V11 · Question #112
From the following table, identify the wrong answer in terms of Range (ft).
The correct answer is D. 802.11a. 802.11a operates at 5 GHz and has a shorter indoor range (approximately 115-120 ft) compared to 802.11b and 802.11g at 2.4 GHz (approximately 300 ft), so a table listing 802.11a with a range equal to or greater than the 2.4 GHz standards would be incorrect.
Question
From the following table, identify the wrong answer in terms of Range (ft).
Options
- A802.11b
- B802.11g
- C802.16(WiMax)
- D802.11a
How the community answered
(29 responses)- A3% (1)
- B7% (2)
- C3% (1)
- D86% (25)
Why each option
802.11a operates at 5 GHz and has a shorter indoor range (approximately 115-120 ft) compared to 802.11b and 802.11g at 2.4 GHz (approximately 300 ft), so a table listing 802.11a with a range equal to or greater than the 2.4 GHz standards would be incorrect.
802.11b operates at 2.4 GHz with a standard indoor range of roughly 300 ft, which is a well-established and correct specification.
802.11g also operates at 2.4 GHz with approximately 300 ft of indoor range, consistent with published IEEE specifications.
802.16 (WiMax) is a metropolitan-area wireless standard designed for ranges of several miles (up to 30+ miles), which is correct and distinct from the short-range 802.11 family.
802.11a uses the 5 GHz band, which suffers greater attenuation and has a noticeably shorter effective indoor range - roughly 115 to 125 ft - compared to 802.11b and 802.11g at 2.4 GHz, which reach approximately 300 ft. A table entry showing 802.11a with a range comparable to or exceeding the 2.4 GHz standards would be the factually wrong entry.
Concept tested: IEEE 802.11 wireless standard frequency and range comparison
Source: https://en.wikipedia.org/wiki/IEEE_802.11
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