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Difficulty: MediumWired and Wireless Network Issues

A network administrator is investigating network problems in an expanded office branch. Users connected to the 2.4 GHz wireless network experience frequent disconnections and throughput drops during high-density hours. Simultaneously, several wired desktop users report that their workstations suddenly lost corporate network access, and running 'ipconfig' reveals IP addresses starting with 169.254.x.x. Which of the following actions should the administrator perform to resolve these issues? (Select TWO.)

  1. Reconfigure the 2.4 GHz wireless access points to use non-overlapping channels 1, 6, and 11.Answer
  2. Check physical Ethernet link infrastructure and verify connectivity to the DHCP server.Answer
  3. C
    Reconfigure the primary DNS server settings to dynamically issue IP leases to the affected wired workstations.
  4. D
    Distribute the 2.4 GHz wireless access points onto adjacent channels 2, 4, and 7 to spread channel utilization.

Answer

The administrator should reconfigure the 2.4 GHz wireless access points to use non-overlapping channels (1, 6, and 11) and check physical Ethernet link infrastructure while verifying reachability to the DHCP server.
Wireless signal disconnections on 2.4 GHz networks are resolved by assigning access points to non-overlapping channels (1, 6, and 11). Simultaneously, an IP address in the 169.254.x.x range represents APIPA, which occurs when a system cannot reach a DHCP server due to physical cable disconnections, switch port misconfigurations, or DHCP server outages.

Step-by-Step Solution

1
Diagnose the wireless drops and performance degradation on the 2.4 GHz band.
Co-channel interference is identified as the root cause due to overlapping channel configurations in a multi-AP deployment.
The 2.4 GHz spectrum only supports three non-overlapping channels: 1, 6, and 11. Other channels bleed into adjacent frequencies.
2
Diagnose the wired workstations displaying 169.254.x.x IP addresses.
The workstations have assigned themselves Automatic Private IP Addressing (APIPA) because they are unable to obtain a response from a DHCP server.
When a client fails to receive a DHCP acknowledgment over the network connection, Windows automatically defaults to an APIPA address.
3
Execute the proper corrective actions for both issues.
Reconfiguring wireless access point channels to 1, 6, and 11 restores wireless throughput, while restoring physical cabling integrity or DHCP server access resolves APIPA fallback.
Proper channel separation eliminates RF interference, and establishing DHCP reachability grants valid network IP configurations.

Key Concept

Troubleshooting APIPA DHCP reachability failures on wired links alongside 2.4 GHz non-overlapping channel allocation
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Topics

Wired and Wireless Network Issues

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