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Question

Difficulty: EasyWired and Wireless Network Issues

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

  • A workstation receives an IP address starting with 169.254.x.x.DHCP server unreachable or non-responsive
  • A laptop loses wireless connection whenever a nearby microwave oven is operating.2.4 GHz wireless frequency interference
  • A user can successfully ping 8.8.8.8 but cannot access websites by domain name.DNS server address misconfigured or offline
  • An Ethernet port link light remains unlit after plugging in a known-good patch cable.Disabled network interface card or damaged switch port

Answer

Matching pairs: APIPA address (169.254.x.x) matches DHCP server unreachable; Microwave interference matches 2.4 GHz wireless frequency interference; Successful IP ping with failed URL navigation matches DNS server address misconfigured; Dark link light with good cable matches Disabled network interface card or damaged switch port.
Each symptom directly corresponds to a specific failure mechanism: APIPA indicates unreachable DHCP; microwave interference affects 2.4 GHz Wi-Fi; pinging IP addresses but failing on URLs indicates DNS failure; and an unlit link light with a good cable indicates a disabled interface or damaged physical port.

Step-by-Step Solution

1
Identify APIPA cause
Recognized 169.254.x.x as APIPA, indicating DHCP auto-configuration failure.
Clients fall back to APIPA when no DHCP server responds to discovery requests.
2
Identify microwave disruption cause
Correlated microwave activity with 2.4 GHz Wi-Fi disruptions.
Consumer microwave ovens emit signals in the 2.4 GHz ISM band.
3
Identify DNS failure symptom
Recognized successful IP ping vs failed URL access as a domain resolution issue.
IP connectivity works at Layer 3, but resolving domain names requires a functioning DNS server.
4
Identify physical link failure cause
Determined root cause for dark link light on a verified working cable.
No link light on a verified working cable indicates hardware port issues or a disabled adapter.

Key Concept

Diagnosing common wired and wireless network connectivity symptoms and identifying their root causes.
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Topics

Wired and Wireless Network Issues

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