When the 2.4G frequency band is used for coverage in the case of dense WLAN users and a large number of APs, the H40 method can be used to increase the bandwidth.

Question

Options

• ATrue
• BFalse

• A
  20% (8)
• B
  80% (33)

Explanation

Option B (False) is correct because using HT40 (40MHz channel bonding, referred to here as H40) on the 2.4GHz band in a dense AP environment is counterproductive, not beneficial. The 2.4GHz band only supports 3 non-overlapping 20MHz channels (1, 6, 11); bonding to 40MHz reduces this to essentially zero non-overlapping channels, causing severe co-channel interference across all nearby APs. In high-density deployments, the resulting interference degrades throughput for all users rather than increasing it.

Option A (True) is wrong because while H40 does double the raw channel width in isolation, it assumes spectrum availability that simply does not exist in the crowded 2.4GHz band - especially when many APs are deployed in close proximity.

Memory tip: Think "2.4G + dense APs = stay narrow." In dense 2.4GHz environments, narrower channels (20MHz) preserve non-overlapping channel reuse; widening to 40MHz is a 5GHz strategy where 20+ non-overlapping channels make it viable. If the question pairs "2.4GHz + many APs + H40 = better," the answer is always False.

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