In WLAN network, according to different channel bundling methods, the channel working bandwidth can be divided into several different types: 40MHz+, 40 MHz, 80 MHz, 80+80 MHZ and 160MHz. Which of…

Question

Options

• A80MHz is to bundle two consecutive 40MHZ channels together and select the higher frequency
• B80MHz is to bundle two consecutive 40MHZ channels together and select one of the four 20MHz
• C80MHz is to bundle two discontinuous 40MHZ channels together and select the higher frequency
• D80MHz is to bundle two discontinuous 40MHZ channels together and select one of the four

• A
  14% (2)
• B
  71% (10)
• C
  7% (1)
• D
  7% (1)

Explanation

Option B is correct because an 80MHz channel is formed by bundling two consecutive (contiguous) 40MHz channels, which together span four 20MHz sub-channels, and the primary channel is designated as one of those four 20MHz sub-channels - not forced to the highest frequency.

Why the distractors fail:

• A is wrong because while it correctly identifies the channels as consecutive, it incorrectly states the primary channel is "the higher frequency" - the primary can be any of the four 20MHz sub-channels.
• C is wrong on both counts: 80MHz requires consecutive channels (not discontinuous), and it doesn't select "the higher frequency" - that's a confusion of two separate errors.
• D gets the primary channel selection right ("one of the four") but incorrectly describes the channels as discontinuous - that description belongs to the 80+80MHz mode, which deliberately uses two separate, non-adjacent 80MHz blocks.

Memory tip: Think of it as a spectrum of consecutiveness - 80MHz is a single contiguous block of four 20MHz channels (consecutive), while 80+80MHz is what you get when you break that into two separate pieces (discontinuous). If the answer mentions discontinuous channels for plain "80MHz," it's describing the plus variant (80+80), not standard 80MHz.

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