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Difficulty: MediumTroubleshooting Wireless Connectivity and Signal Issues

A network administrator is troubleshooting poor Wi-Fi performance and frequent disconnections in an enterprise office space. A site survey reveals severe adjacent-channel interference on the 2.4 GHz band due to access points (APs) operating on channels 3 and 8. Furthermore, users working at the outer perimeter of the building experience signal degradation, with RSSI readings dropping below −85 dBm-85\text{ dBm} on the 5 GHz band. Which of the following actions should the network administrator take to resolve these wireless connectivity issues? (Select TWO.)

  1. Reconfigure the 2.4 GHz radios on all access points to operate exclusively on non-overlapping channels 1, 6, and 11.Answer
  2. Increase the transmit power on the 5 GHz radios servicing the building perimeter areas.Answer
  3. C
    Expand the channel width on the 2.4 GHz radios from 20 MHz to 40 MHz to mitigate channel overlap.
  4. D
    Configure static DHCP address reservations on the default gateway for all affected wireless clients.

Answer

The administrator should reconfigure the 2.4 GHz radios to operate exclusively on non-overlapping channels 1, 6, and 11, and increase the transmit power on the 5 GHz radios servicing the perimeter areas.
Reconfiguring the 2.4 GHz radios to channels 1, 6, and 11 prevents adjacent-channel interference caused by non-standard channels 3 and 8. Raising the 5 GHz transmit power near the perimeter boosts RSSI values above the unreliable −85 dBm-85\text{ dBm} threshold, ensuring stable client connectivity.

Step-by-Step Solution

1
Analyze the 2.4 GHz channel allocation issue.
Channels 3 and 8 overlap with surrounding standard channels (1, 6, 11), causing adjacent-channel interference (ACI).
In North America, standard 2.4 GHz Wi-Fi deployments require using non-overlapping channels 1, 6, and 11 to avoid frequency collision.
2
Address the 5 GHz signal attenuation issue at the building perimeter.
An RSSI reading below −85 dBm-85\text{ dBm} indicates excessive signal attenuation and weak coverage.
Increasing transmit power on the 5 GHz AP radios expands the coverage cell size, bringing signal strength into an acceptable operating range (typically −65 dBm-65\text{ dBm} to −70 dBm-70\text{ dBm}).

Key Concept

Wireless RF Channel Planning & Transmit Power Management
Estimated Time:1m 30s
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Topics

Troubleshooting Wireless Connectivity and Signal Issues

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