What is the working frequency band used by the original 802.11 protocol?

Question

Options

• A2.4 GHz
• B900MHz
• C2.0 GHz
• D5 GHz

• A
  73% (32)
• B
  5% (2)
• C
  7% (3)
• D
  16% (7)

Explanation

Option A (2.4 GHz) is correct because the original IEEE 802.11 standard, ratified in 1997, operated in the 2.4 GHz ISM (Industrial, Scientific, and Medical) band, which was unlicensed and globally available. Option B (900 MHz) is incorrect - that band is associated with older cordless phones and some IoT/LPWAN technologies, not 802.11. Option C (2.0 GHz) is a fabricated distractor; no mainstream 802.11 standard uses a 2.0 GHz band. Option D (5 GHz) is incorrect for the original protocol - 5 GHz came later with 802.11a, also ratified in 1999 but not part of the foundational standard.

Memory tip: Associate 2.4 GHz with "the original and universal" WiFi band - it has been present in every generation of 802.11 devices from the very beginning, making it the easiest band to remember as the starting point.

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