Examkin

Question

Difficulty: MediumWireless Networking Standards and Technologies

A network technician is updating documentation for legacy and modern wireless deployments. Match each IEEE 802.11 wireless standard to its corresponding operating frequency band, maximum theoretical throughput, or core technology feature.

  • IEEE 802.11aOperates exclusively in the 5 GHz band using OFDM modulation to provide up to 54 Mbps theoretical throughput.
  • IEEE 802.11gOperates in the 2.4 GHz band using OFDM up to 54 Mbps while maintaining backward compatibility with 802.11b.
  • IEEE 802.11acOperates exclusively in the 5 GHz band for high-throughput connections, introducing downlink MU-MIMO and 160 MHz channel bonding.
  • IEEE 802.11axOperates across 2.4 GHz, 5 GHz, and 6 GHz bands, introducing OFDMA and bi-directional MU-MIMO for dense client environments.

Answer

IEEE 802.11a matches 5 GHz exclusive operation at 54 Mbps using OFDM; IEEE 802.11g matches 2.4 GHz operation at 54 Mbps with 802.11b backward compatibility; IEEE 802.11ac matches 5 GHz exclusive operation with downlink MU-MIMO and 160 MHz channel bonding; IEEE 802.11ax matches multi-band (2.4/5/6 GHz) operation featuring OFDMA and bi-directional MU-MIMO.
Each IEEE 802.11 standard defines specific operational parameters: 802.11a brought 54 Mbps OFDM to 5 GHz; 802.11g brought 54 Mbps OFDM to 2.4 GHz with 802.11b compatibility; 802.11ac enhanced 5 GHz throughput using downlink MU-MIMO and 160 MHz channels; and 802.11ax introduced OFDMA and bi-directional MU-MIMO across 2.4 GHz, 5 GHz, and 6 GHz spectrums.

Step-by-Step Solution

1
Differentiate legacy 54 Mbps standards by frequency band and backward compatibility requirements
802.11a operates exclusively at 5 GHz using OFDM. 802.11g operates at 2.4 GHz using OFDM and supports backward compatibility with legacy 802.11b devices.
Although both standards share a maximum theoretical throughput of 54 Mbps using OFDM, their operating spectrums and legacy fallback capabilities differ.
2
Identify key architectural improvements introduced in 802.11ac (Wi-Fi 5)
802.11ac requires 5 GHz operation, introducing downlink Multi-User MIMO (MU-MIMO) and wider channels up to 160 MHz.
802.11ac shifted higher-speed transmissions entirely to the less congested 5 GHz band.
3
Identify key architectural improvements introduced in 802.11ax (Wi-Fi 6 / 6E)
802.11ax operates across 2.4 GHz, 5 GHz, and 6 GHz, incorporating Orthogonal Frequency-Division Multiple Access (OFDMA) and full bi-directional MU-MIMO.
OFDMA allows a single channel to be subdivided among multiple users simultaneously, solving density bottlenecks.

Key Concept

Key technical characteristics, operating frequencies, and channel management technologies across IEEE 802.11 wireless standards.
Rate this question

Topics

Wireless Networking Standards and Technologies

More questions from this topic