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Difficulty: MediumWireless Networking Standards and Technologies

A network technician is upgrading a wireless network in a high-density office space to increase overall throughput and reduce latency during peak usage hours. The specification requires access points that natively support Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology to communicate with multiple client devices simultaneously. Which of the following IEEE wireless standards support MU-MIMO capability? (Select TWO.)

  1. IEEE 802.11acAnswer
  2. IEEE 802.11axAnswer
  3. C
    IEEE 802.11g
  4. D
    IEEE 802.11b

Answer

IEEE 802.11ac and IEEE 802.11ax support Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology.
IEEE 802.11ac (Wi-Fi 5) brought downlink MU-MIMO into wireless networking standards, and IEEE 802.11ax (Wi-Fi 6) further upgraded this by supporting both uplink and downlink MU-MIMO, enabling multi-device concurrent communication.

Step-by-Step Solution

1
Identify the technical requirements in the scenario.
The key technical capability requested is MU-MIMO (Multi-User Multiple-Input Multiple-Output) support.
MU-MIMO allows access points to talk to multiple client devices concurrently rather than sequentially.
2
Evaluate the capabilities of each listed 802.11 standard.
802.11b and 802.11g are legacy 2.4 GHz standards limited to SISO operation. 802.11ac introduced downlink MU-MIMO, and 802.11ax enhanced it with bidirectional MU-MIMO.
MIMO was introduced in 802.11n (SU-MIMO), while MU-MIMO was added in 802.11ac (Wave 2) and expanded in 802.11ax.
3
Select the correct wireless standards.
IEEE 802.11ac and IEEE 802.11ax are the correct answers.
Both standards natively incorporate MU-MIMO features.

Key Concept

MU-MIMO Capabilities in Wireless Standards
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Topics

Wireless Networking Standards and Technologies

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