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EC-Council

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.

Hacking Wireless Networks

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)
  • A
    3% (1)
  • B
    7% (2)
  • C
    3% (1)
  • D
    86% (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.

A802.11b

802.11b operates at 2.4 GHz with a standard indoor range of roughly 300 ft, which is a well-established and correct specification.

B802.11g

802.11g also operates at 2.4 GHz with approximately 300 ft of indoor range, consistent with published IEEE specifications.

C802.16(WiMax)

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.

D802.11aCorrect

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

Topics

#802.11 standards#wireless range#WiMax#802.11a

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