A customer deployed AP-535s for IoT devices that send many small packets. They want to reduce congestion and allow simultaneous transmission to or from multiple users.

Question

Options

• AUL MU-MIMO
• BDL MU-MIMO
• CHE TXBF
• DOFDMA

• A
  7% (2)
• C
  3% (1)
• D
  90% (27)

Explanation

OFDMA is correct because it divides the Wi-Fi channel into smaller sub-channels called Resource Units (RUs), allowing multiple clients to transmit simultaneously in the frequency domain - making it ideal for many IoT devices sending small, bursty packets without wasting a full channel on each one.

Why the distractors are wrong:

• UL MU-MIMO (A) and DL MU-MIMO (B) allow simultaneous multi-user transmission using spatial streams (antennas), but each user still occupies the full channel width - wasteful for small packets and requires good signal conditions with capable client hardware.
• HE TXBF (C) - High Efficiency Transmit Beamforming - focuses the signal toward individual clients to improve link quality, but it's a single-link optimization, not a multi-user channel-sharing mechanism.

Memory tip: Think of OFDMA as a pizza cut into slices - every IoT device gets its own slice of the frequency simultaneously. MU-MIMO gives each device a whole pizza but requires them to be in different spatial directions. Small packets = small slices = OFDMA wins.

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