What are the rates supported by 802.11g?

Question

Options

• A1, 2, 5.5, 11&6, 9, 12, 18, 24, 30, 36, 48, 54 Mbps
• B6, 9, 12, 18, 24, 36, 48, 54 Mbps
• C1, 2, 5.5, 11&6, 9, 12, 18, 24, 36, 48, 54 Mbps
• D6, 9, 12, 18, 24, 30, 36, 48, 54 Mbps

• A
  14% (7)
• B
  8% (4)
• C
  74% (37)
• D
  4% (2)

Explanation

Option C is correct because 802.11g is backward compatible with 802.11b, meaning it must support the older 802.11b rates (1, 2, 5.5, and 11 Mbps) in addition to its own OFDM-based rates (6, 9, 12, 18, 24, 36, 48, and 54 Mbps). Option B is wrong because it lists only the OFDM rates and omits the legacy 802.11b rates entirely - that list describes 802.11a, not 802.11g. Options A and D are wrong because they both include 30 Mbps, which is not a defined rate in either 802.11b or 802.11g; no standard Wi-Fi protocol in this family uses 30 Mbps. The difference between A and C is that A adds the phantom 30 Mbps to an otherwise correct list.

Memory tip: 802.11g = 802.11b rates (1, 2, 5.5, 11) plus 802.11a OFDM rates (6, 9, 12, 18, 24, 36, 48, 54). If you see 30 Mbps anywhere in an 802.11g answer choice, eliminate it immediately.

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