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Zorluk: OrtaTroubleshooting Wireless Connectivity and Signal Issues

A network technician is investigating reports of intermittent connectivity and reduced throughput in a newly renovated conference room where decorative mirror panels were installed along the walls. Signal readings show a strong Received Signal Strength Indicator (RSSI) of −55 dBm-55\text{ dBm}, but the Signal-to-Noise Ratio (SNR) is low and packet captures reveal a high frequency of corrupted 802.11 frames requiring retransmission. Which of the following wireless phenomena is most likely causing this signal degradation?

  1. Multipath distortion resulting from RF signal reflection off metallic mirror backingsCevap
  2. B
    Adjacent-channel interference caused by assigning non-overlapping channels across access points
  3. C
    An automated failover to an APIPA address caused by DHCP scope exhaustion on the wireless VLAN
  4. D
    A Ethernet duplex mismatch occurring between the access point and its connected switch port

Cevap

Multipath distortion resulting from RF signal reflection off metallic mirror backings
The correct answer identifies multipath distortion caused by signal reflection off the metallic backing of the decorative mirrors. When radio waves bounce off reflective surfaces, multiple signals arrive at the receiving client out of phase, leading to signal cancellation, lower Signal-to-Noise Ratio (SNR), and high frame corruption despite high measured signal power (RSSI).

Adım Adım Çözüm

1
Analyze the physical environment and symptoms
Decorative mirrors (which contain metallic backings) were added, and symptoms show strong RSSI but poor SNR and high frame retransmissions.
Metal surfaces act as RF reflectors, causing radio waves to bounce off obstacles and take multiple propagation paths to the receiver.
2
Evaluate the RF behavior
Reflected waves arrive at the receiver at slightly different times and phases, causing destructive phase cancellation.
This phenomenon, known as multipath interference or multipath distortion, corrupts incoming frames while maintaining high overall RF energy (RSSI).
3
Select the correct diagnosis
Multipath distortion caused by reflection from the metallic mirror backings is identified as the root cause.
Other options describe Layer 3 IP assignment issues, wired physical link errors, or incorrect channel configuration concepts.

Anahtar Kavram

RF Reflection and Multipath Distortion
Tahmini Süre:1m 15s
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Troubleshooting Wireless Connectivity and Signal Issues

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