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Difficulty: MediumTroubleshooting Wireless Connectivity and Signal Issues

Employees in a newly renovated office suite report that laptops connected to the 5 GHz Wi-Fi network experience severe signal drop-offs and low throughput when moving inside glass-walled conference rooms. However, clients connected to the 2.4 GHz wireless network maintain stable signal strength throughout the entire floor. Diagnostic site survey tools reveal a significant drop in RSSI specifically when receiving 5 GHz signals behind the newly installed tinted glass walls. Which of the following is the primary cause of the performance degradation on the 5 GHz band?

  1. Greater signal attenuation and absorption of higher-frequency radio waves by dense building materialsAnswer
  2. B
    Co-channel interference caused by assigning overlapping channels across adjacent access points
  3. C
    A duplex mismatch on the Ethernet cable connecting the access point to the network switch
  4. D
    Failed DHCP lease renewals resulting in clients receiving Automatic Private IP Addressing allocations

Answer

Greater signal attenuation and absorption of higher-frequency radio waves by dense building materials
The correct answer correctly identifies that higher-frequency RF signals, such as 5 GHz, experience greater absorption and attenuation when passing through solid or coated building materials like low-emissivity glass. Because lower frequencies (2.4 GHz) have longer wavelengths, they penetrate physical barriers more effectively, explaining why 2.4 GHz signal strength remains stable while 5 GHz drops significantly.

Step-by-Step Solution

1
Analyze the observed symptoms
The issue specifically affects the 5 GHz frequency band behind glass walls, while 2.4 GHz remains stable.
Different RF frequencies exhibit distinct propagation and penetration characteristics.
2
Evaluate RF attenuation properties by frequency
Higher frequencies (5 GHz) suffer greater free-space path loss and higher absorption rates through physical obstacles compared to lower frequencies (2.4 GHz).
Shorter wavelengths at 5 GHz struggle to penetrate dense or metallic materials like treated low-emissivity glass.
3
Select the matching physical layer cause
Absorption and attenuation by the building material explain the RSSI drop exclusively on the 5 GHz band.
Environmental obstacles impact higher frequency signals more severely.

Key Concept

RF Attenuation and Absorption by Frequency
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Topics

Troubleshooting Wireless Connectivity and Signal Issues

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