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Difficulty: MediumWireless Networking Standards and Technologies

A network administrator is reviewing legacy and modern wireless access point configurations. Match each IEEE 802.11 wireless standard to its primary operational frequency band and core technology features.

  • 802.11aOperates exclusively in the 5 GHz band at up to 54 Mbps using OFDM
  • 802.11gOperates exclusively in the 2.4 GHz band at up to 54 Mbps using OFDM while maintaining backward compatibility with 802.11b
  • 802.11acOperates exclusively in the 5 GHz band, utilizing beamforming and MU-MIMO for multi-gigabit throughput
  • 802.11axOperates across 2.4 GHz, 5 GHz, and 6 GHz bands, introducing OFDMA and Target Wake Time (TWT) for high-density efficiency

Answer

802.11a matches 5 GHz / 54 Mbps OFDM; 802.11g matches 2.4 GHz / 54 Mbps OFDM with 802.11b compatibility; 802.11ac matches 5 GHz exclusive MU-MIMO multi-gigabit; 802.11ax matches multi-band (2.4/5/6 GHz) OFDMA and TWT.
Each IEEE 802.11 standard defines specific operational frequencies and channel access mechanisms: 802.11a operates exclusively on 5 GHz at 54 Mbps; 802.11g operates on 2.4 GHz at 54 Mbps; 802.11ac is a 5 GHz-only standard introducing MU-MIMO; and 802.11ax supports 2.4 GHz, 5 GHz, and 6 GHz using OFDMA.

Step-by-Step Solution

1
Identify the frequency constraints for legacy 54 Mbps standards (802.11a vs. 802.11g).
802.11a is restricted to the 5 GHz band, whereas 802.11g operates on the 2.4 GHz band.
Different physical layer implementations restrict 802.11a to 5 GHz and 802.11g to 2.4 GHz.
2
Evaluate the feature set and frequency support of Wi-Fi 5 (802.11ac).
802.11ac operates exclusively in the 5 GHz spectrum and provides MU-MIMO technology.
Wi-Fi 5 dropped native 2.4 GHz support to focus on high-throughput 5 GHz channels.
3
Analyze the modern multi-band capability and resource allocation technologies of Wi-Fi 6/6E (802.11ax).
802.11ax spans 2.4 GHz, 5 GHz, and 6 GHz bands and incorporates OFDMA and Target Wake Time.
OFDMA allows simultaneous multi-user transmissions per channel, and TWT extends battery life on IoT and mobile client devices.

Key Concept

Wireless Networking Standards and Specifications
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Topics

Wireless Networking Standards and Technologies

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