In WLAN networks, which of the following GI intervals does not belong to the 802.11ax standard?

Question

Options

• A1.6 microseconds
• B0.8 microseconds
• C3.2 microseconds
• D0.4 microseconds

• A
  18% (5)
• B
  7% (2)
• C
  4% (1)
• D
  71% (20)

Explanation

Option D (0.4 µs) is incorrect for 802.11ax because that ultra-short Guard Interval was introduced in 802.11n/ac - 802.11ax (Wi-Fi 6) deliberately dropped it. The three GI values defined in 802.11ax are 0.8 µs, 1.6 µs, and 3.2 µs, which correspond to its OFDMA symbol durations and provide better multipath resilience in dense environments.

Options A (1.6 µs) and C (3.2 µs) are wrong as distractors because both are genuinely new GI values introduced by 802.11ax - they do belong to the standard. Option B (0.8 µs) is wrong as a distractor because it is the default/minimum GI carried over into 802.11ax from prior generations.

Memory tip: Think "802.11ax dropped the 0.4" - Wi-Fi 6 went longer, not shorter, adding 1.6 and 3.2 µs options for denser, noisier environments, and kept 0.8 µs as the floor. If you see 0.4 µs, that's a Wi-Fi 5 (802.11ac) clue, not Wi-Fi 6.

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