CyberCertPrepNetwork FundamentalsWireless BasicsEASYFree question
What Wi-Fi standard introduced support for the 5 GHz band in addition to 2.4 GHz?
- A.802.11b
- B.802.11g
- C.802.11n (Wi-Fi 4) - it was the first dual-band standard operating on both 2.4 GHz and 5 GHz simultaneously
- D.802.11a - but this was 5 GHz only, not dual-band
Why C is correct
802.11a (1999): 5 GHz only, 54 Mbps. 802.11b (1999): 2.4 GHz only, 11 Mbps. 802.11g (2003): 2.4 GHz only, 54 Mbps. 802.11n (2009, Wi-Fi 4): first standard to support both 2.4 GHz AND 5 GHz (dual-band) with MIMO, up to 600 Mbps. Dual-band APs allow clients to use both bands. 802.11ac (Wi-Fi 5): 5 GHz only. 802.11ax (Wi-Fi 6): 2.4 and 5 GHz; Wi-Fi 6E adds 6 GHz.
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