802.11g Frequency Band — Choose the correct range Which frequency band does IEEE 802.11g use for wireless LAN operation?

Introduction / Context:
802.11g brought OFDM to the 2.4GHz band while retaining backward compatibility with 802.11b clients. Knowing which band each amendment uses is foundational for channel planning and interference management in WLAN design.

Given Data / Assumptions:

• We are selecting the RF band, not a throughput value.
• 802.11g is the 2.4GHz counterpart to 802.11a's OFDM approach.
• Standard channel widths are 20MHz in legacy g deployments.

Concept / Approach:
802.11g operates strictly in 2.4GHz, supporting a maximum PHY rate of 54Mbps and backward compatibility with 802.11b. Answers with “Gbps” are unit traps; they indicate data rates, not frequencies. Therefore, 2.4GHz is the correct choice.

Step-by-Step Solution:
Map amendments to bands: 11b/g → 2.4GHz; 11a → 5GHz.Eliminate options using Gbps units.Choose 2.4GHz.

Verification / Alternative check:
Any Wi-Fi study guide lists 802.11g at 2.4GHz with OFDM and DSSS coexistence mechanisms for backward compatibility.

Why Other Options Are Wrong:

• 5GHz: That is 802.11a (and 11n/ac/ax can also use it).
• Gbps options: Throughput units, not frequency.
• 900MHz: Not used by 802.11g.

Common Pitfalls:
Assuming 802.11g “moved to 5GHz” because it gained OFDM; only 11a was 5GHz in the legacy pair.

Final Answer:
2.4GHz