In order to ensure that there will be no interference between the channels of the WLAN network, which of the following frequency bands belong to the 5.8GHz frequency band used in China? (Multiple…

Question

Options

• A149
• B151
• C153
• D155

• A
  71% (15)
• B
  10% (2)
• D
  19% (4)

Explanation

Channels 149 and 153 are valid IEEE 802.11 channel designations within China's approved 5.8GHz WLAN band (5.725–5.850 GHz), which also includes channels 157 and 161. In the 5GHz spectrum, channels are spaced 20MHz apart and numbered in increments of 4, meaning the valid sequence in this range is 149 → 153 → 157 → 161. Channels 151 and 155 (options B and D) are incorrect because they fall between standard channel center frequencies - they are simply not defined channel numbers in the IEEE 802.11 standard, and using them would cause interference rather than prevent it.

Memory tip: In the 5.8GHz band, think "odd multiples of 4 + 1" starting at 149 - the pattern is 149, 153, 157, 161 (always add 4). Any number that breaks this +4 pattern (like 151 or 155) is not a real channel.

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