What is the bandwidth of each channel in the 802.11g frequency band?

The correct answer is B. 20 MHz. Each channel in the 802.11g frequency band uses 20 MHz of bandwidth, making B correct. Option D (22 MHz) is a common trap - 22 MHz was the channel spacing used in the older 802.11b standard to describe the channel width at the -3 dB point, but 20 MHz is the standardized usable…

WLAN Basic Knowledge

Question

Options

A25 MHz
B20 MHz
C50 MHz
D22 MHz

How the community answered

(44 responses)

A
11% (5)
B
80% (35)
C
7% (3)
D
2% (1)

Explanation

Each channel in the 802.11g frequency band uses 20 MHz of bandwidth, making B correct. Option D (22 MHz) is a common trap - 22 MHz was the channel spacing used in the older 802.11b standard to describe the channel width at the -3 dB point, but 20 MHz is the standardized usable bandwidth carried forward into 802.11g. Options A (25 MHz) and C (50 MHz) do not correspond to any standard 802.11 channel width - 50 MHz is closer to the 40 MHz bonded channels introduced much later in 802.11n. For the exam, remember that both 802.11g and 802.11a use 20 MHz channels - the "g" and "a" standards share this 20 MHz figure, which helps distinguish them from the older 22 MHz figure associated with 802.11b.

Topics

#802.11g#channel bandwidth#frequency bands#PHY specifications

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