802.11b supports () channels in the United States, of which () channels do not overlap.

Question

Options

• A14, 3
• B11, 3
• C11, 6
• D14, 6

• A
  14% (4)
• B
  75% (21)
• C
  7% (2)
• D
  4% (1)

Explanation

Option B is correct because 802.11b operates in the 2.4 GHz band, and the FCC permits 11 channels for use in the United States. Of those 11 channels, only 3 are non-overlapping (channels 1, 6, and 11), meaning they can be used simultaneously in the same area without causing co-channel interference. Option A and D are wrong because 14 channels is the global maximum defined by the standard (used in Japan), not the US allocation. Options C and D are wrong because 6 non-overlapping channels is incorrect - each channel in the 2.4 GHz band is 22 MHz wide with only 5 MHz spacing, so channels must be at least 5 apart to avoid overlap, yielding only 3 truly non-overlapping channels within the 11-channel US range.

Memory tip: Remember "11 in the US, 3 don't fuss" - 11 channels available, and the 3 non-overlapping ones are channels 1, 6, and 11, each separated by exactly 5 channels.

No community discussion yet for this question.