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Zorluk: OrtaWired and Wireless Network Issues

A technician is troubleshooting a desktop computer that was recently moved to a new office workstation. The user reports that the system cannot access internal file shares or the internet. The technician runs `ipconfig` on the machine and observes an IPv4 address of 169.254.10.45 with a subnet mask of 255.255.0.0. Inspection of the computer's network interface card (NIC) reveals a solid green link light and an amber activity light. Which of the following is the MOST likely cause of the network connectivity issue?

  1. The computer is unable to communicate with a DHCP server to obtain a valid IP address configuration.Cevap
  2. B
    The local DNS server is offline and unable to resolve the hostname to an IP address.
  3. C
    The Ethernet patch cable has a physical Layer 1 break, preventing link communication.
  4. D
    The unmanaged switch requires a routing table update to forward packets outside the local subnet.

Cevap

The workstation is unable to reach a DHCP server, causing Windows to assign an Automatic Private IP Addressing (APIPA) address.
An IP address starting with 169.254.x.x indicates Automatic Private IP Addressing (APIPA). When a system is configured for DHCP but cannot communicate with a DHCP server, Windows automatically assigns an APIPA address. Because the NIC link light is active (solid green), physical connectivity is established, making DHCP unreachability (e.g., VLAN misconfiguration or DHCP server failure) the correct diagnosis.

Adım Adım Çözüm

1
Analyze the ipconfig output.
The IPv4 address 169.254.10.45 falls within the designated APIPA block (169.254.0.0/16).
An APIPA address indicates that the NIC hardware is functioning, but the operating system could not obtain a response from a DHCP server.
2
Evaluate the physical network interface diagnostics.
The solid green link light confirms Layer 1 physical connectivity between the NIC and the switch port.
Eliminates physical cable disconnects, pinout errors, or damaged port pins as the primary root cause.
3
Correlate APIPA assignment with network services.
Confirm DHCP failure (such as exhausted scope, VLAN mismatch, or DHCP relay/server offline).
DHCP is responsible for dynamic IP configuration, and failure to receive a lease results directly in APIPA self-assignment.

Anahtar Kavram

APIPA Interpretation & DHCP Failure Diagnostics
Tahmini Süre:1m 15s
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Wired and Wireless Network Issues

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