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Question

Difficulty: EasyWired and Wireless Network Issues

A help desk technician reviews the diagnostic output of a workstation experiencing local network connectivity failure. The output displays an IPv4 address of 169.254.42.88169.254.42.88 with a subnet mask of 255.255.0.0255.255.0.0. Which of the following represents the most likely cause of this issue?

  1. The client computer failed to contact a DHCP server and self-assigned an APIPA address.Answer
  2. B
    The local DNS server is offline and unable to issue dynamic IP address leases.
  3. C
    The network interface card is misconfigured to use port 80 instead of port 443.
  4. D
    The local network switch is incorrectly routing Layer 3 traffic between subnets.

Answer

The client computer failed to contact a DHCP server and self-assigned an APIPA address.
An IP address in the range of 169.254.0.0/16169.254.0.0/16 indicates that the system is using Automatic Private IP Addressing (APIPA). Operating systems assign an APIPA address when the network adapter is set to acquire an IP address automatically via DHCP, but no response is received from a DHCP server.

Step-by-Step Solution

1
Analyze the IP address provided in the workstation's diagnostic output.
The address falls within the 169.254.0.1169.254.0.1 to 169.254.255.254169.254.255.254 range.
This specific address range is reserved for Automatic Private IP Addressing (APIPA).
2
Identify the underlying cause of an APIPA address assignment.
APIPA is automatically configured by the operating system when dynamic IP configuration is enabled but no DHCP server responds.
Recognizing APIPA points directly to DHCP server unreachability or network failure at/above the DHCP layer.

Key Concept

Automatic Private IP Addressing (APIPA)
Estimated Time:45s
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Topics

Wired and Wireless Network Issues

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