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Difficulty: HardWireless Network Deployment and Standards

A network engineer is configuring a multi-access point wireless deployment operating in the 2.4 GHz band for an enterprise office in North America. To optimize spectrum utilization, prevent adjacent-channel interference (ACI), and effectively manage co-channel interference (CCI) across adjacent coverage cells, which of the following deployment strategies should be implemented? (Select TWO.)

  1. Restrict 2.4 GHz channel assignments strictly to non-overlapping channels 1, 6, and 11 across neighboring access points.Answer
  2. Lower the transmission power levels on the 2.4 GHz radios of adjacent access points.Answer
  3. C
    Configure four adjacent access points with channels 1, 4, 7, and 10 to evenly distribute the 2.4 GHz frequency spectrum.
  4. D
    Bond adjacent 2.4 GHz channels into 40 MHz channel widths to expand total capacity across AP coverage cells.
  5. E
    Assign channels 2, 6, and 10 across adjacent access points to provide single-channel buffer zones between radios.

Answer

The engineer should restrict 2.4 GHz radio assignments strictly to non-overlapping channels 1, 6, and 11 across neighboring access points, and lower transmission power levels on the 2.4 GHz radios to shrink coverage cells and mitigate co-channel interference.
Restricting 2.4 GHz radio assignments strictly to non-overlapping channels 1, 6, and 11 ensures that neighboring cells do not cause adjacent-channel interference (ACI). Furthermore, lowering the transmission power on 2.4 GHz radios reduces the coverage radius of each cell, preventing co-channel interference (CCI) between access points that reuse the same channel across a multi-AP facility.

Step-by-Step Solution

1
Analyze 2.4 GHz spectrum boundaries and channel width parameters.
Recognize that 2.4 GHz Wi-Fi channels are 20 MHz wide but separated by only 5 MHz center frequencies. Non-overlapping deployment in North America requires a minimum 25 MHz separation, which leaves only channels 1, 6, and 11.
Deploying overlapping channels causes adjacent-channel interference, preventing access points from decoding frame preambles cleanly.
2
Evaluate cell sizing and channel reuse strategy.
Determine that reducing radio transmission power shrinks cell boundaries.
Smaller cells prevent distant access points sharing the same non-overlapping channel from contending for the medium, directly reducing co-channel interference (CCI).

Key Concept

Wireless 2.4 GHz Channel Planning and Power Management
Estimated Time:2m 0s
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Topics

Wireless Network Deployment and Standards

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