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Difficulty: MediumTroubleshooting Wireless Connectivity and Signal Issues

A network engineer is responding to reports of severe latency and packet loss affecting handheld inventory scanners in a fulfillment warehouse. A spectrum analysis of the 2.4 GHz band shows that three adjacent Access Points (APs) covering the same zone are configured to use Channel 1, Channel 3, and Channel 4, respectively. Which of the following identifies the primary cause of the wireless connectivity issues?

  1. Adjacent-channel interference caused by overlapping 2.4 GHz channelsAnswer
  2. B
    Exhaustion of the DHCP scope assigned to the wireless management VLAN
  3. C
    Native VLAN mismatch across the 802.1Q trunk connection to the APs
  4. D
    Physical duplex mismatch between the AP ethernet interfaces and switchports

Answer

Adjacent-channel interference caused by overlapping 2.4 GHz channels
The 2.4 GHz Wi-Fi spectrum only contains three non-overlapping channels: Channel 1, Channel 6, and Channel 11. Assigning channels 1, 3, and 4 causes adjacent-channel interference (ACI), where transmissions on neighboring channels corrupt each other's RF signals, leading to high packet loss and latency.

Step-by-Step Solution

1
Analyze the 2.4 GHz spectrum channel configuration
Channels 1, 3, and 4 overlap significantly in frequency ranges
The 2.4 GHz Wi-Fi spectrum has 22 MHz channel widths spaced 5 MHz apart, requiring at least 5 channels of separation to prevent overlap.
2
Identify standard non-overlapping channel deployment guidelines
Standard non-overlapping channels in North America/International 2.4 GHz Wi-Fi are 1, 6, and 11
Configuring APs on adjacent overlapping channels (such as 1, 3, and 4) creates adjacent-channel interference (ACI), causing signal corruption and frame retransmissions.

Key Concept

2.4 GHz Non-Overlapping Channel Planning
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Topics

Troubleshooting Wireless Connectivity and Signal Issues

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