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Zorluk: KolayWired and Wireless Network Issues

Match each network troubleshooting symptom on the left with its most likely root cause on the right.

  • An autoconfigured IP address of 169.254.10.15 is assigned to a workstation.Unreachable DHCP server preventing dynamic IP allocation.
  • The Network Interface Card (NIC) LED indicator remains completely dark after plugging in a cable.Physical layer disconnection, damaged cable, or disabled switch port.
  • A laptop shows maximum Wi-Fi signal strength but repeatedly fails during connection attempts.Incorrect WPA2/WPA3 pre-shared key or passphrase entry.
  • A ping test shows high latency spikes and packet loss only when large file transfers occur.Network congestion or improper Quality of Service (QoS) queueing.

Cevap

1. APIPA IP address (169.254.x.x) matches Unreachable DHCP server. 2. Unlit NIC LED matches Physical layer disconnection or damaged cable. 3. Full signal with connection failure matches Incorrect WPA2/WPA3 pre-shared key. 4. High latency spikes under load matches Network congestion or improper QoS queueing.
Each symptom maps directly to its specific diagnostic cause: 169.254.x.x addresses indicate APIPA fallback due to missing DHCP responses; unlit NIC LEDs indicate a Layer 1 physical link disconnection; strong Wi-Fi signals with failed connections indicate incorrect authentication passphrases; and traffic-dependent latency spikes indicate queue congestion.

Adım Adım Çözüm

1
Identify the significance of the 169.254.10.15 address.
Recognize this as an Automatic Private IP Address (APIPA).
Operating systems automatically assign an APIPA when a DHCP discover/request cycle times out without receiving a lease.
2
Evaluate the dark NIC LED status.
Identify physical hardware/cabling failure.
Link LEDs illuminate upon detecting electrical/optical carrier signals at the Physical layer regardless of Layer 3 IP configurations.
3
Analyze wireless authentication failure despite strong signal.
Determine security key mismatch.
Strong Received Signal Strength Indicator (RSSI) confirms adequate coverage, isolating the failure to the WPA authentication phase.
4
Evaluate load-dependent latency spikes.
Identify bandwidth saturation and missing QoS policies.
Performance degradation occurring exclusively under high traffic load points to queue congestion on router/switch interfaces.

Anahtar Kavram

Wired and Wireless Network Troubleshooting Symptoms and Causes
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Wired and Wireless Network Issues

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