CyberCertPrepNetwork FundamentalsWireless BasicsEASYFree question
What is the difference between 802.11a and 802.11b, and why did 802.11b achieve broader market adoption despite being slower?
- A.802.11a operates at 5 GHz with up to 54 Mbps; 802.11b operates at 2.4 GHz with up to 11 Mbps; 802.11b achieved broader adoption because 2.4 GHz hardware was less expensive to produce due to existing unlicensed band infrastructure and the 2.4 GHz components were cheaper than 5 GHz components at the time
- B.802.11a and 802.11b are identical; both operate at 2.4 GHz
- C.802.11b is faster at 54 Mbps; 802.11a is limited to 11 Mbps
- D.802.11a achieved broader adoption because 5 GHz has less interference
Why A is correct
802.11a (1999): operates at 5 GHz, uses OFDM, max 54 Mbps, but 5 GHz hardware was expensive and had shorter range due to higher path loss at 5 GHz. 802.11b (1999): operates at 2.4 GHz, uses DSSS (Direct Sequence Spread Spectrum), max 11 Mbps. Despite lower speed, 802.11b won the market because 2.4 GHz hardware components (chipsets, amplifiers) were far cheaper due to existing DECT phone and microwave technology manufacturing infrastructure, resulting in lower consumer device costs. Options B (incorrect specs), C (reversed speeds), and D (5 GHz did not dominate) are all factually wrong.
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