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Difficulty: EasyTroubleshooting IP Addressing and DHCP Services

A workstation on an enterprise network is unable to access internal network shares or the Internet. A network technician runs `ipconfig` on the command prompt and receives the following output:

IPv4 Address. . . . . . . . . . . . : 169.254.184.91
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :

Which of the following is the most likely cause of this issue?

  1. The workstation failed to reach a DHCP server and self-assigned an Automatic Private IP Addressing (APIPA) address.Answer
  2. B
    The workstation default gateway IP address was statically configured on an incompatible subnet.
  3. C
    The local router interface requires a DHCP relay agent to permit static IP address assignments.
  4. D
    The workstation was automatically assigned the subnet broadcast address due to a scope calculation error.

Answer

The workstation failed to reach a DHCP server and self-assigned an Automatic Private IP Addressing (APIPA) address.
An IPv4 address in the range 169.254.0.1 through 169.254.255.254 indicates that the operating system assigned an Automatic Private IP Addressing (APIPA) address after failing to contact a DHCP server.

Step-by-Step Solution

1
Examine the IP address assigned to the host from the command output.
The host IP is 169.254.184.91 with a subnet mask of 255.255.0.0.
IP addresses in the 169.254.0.0/16 block are reserved for Automatic Private IP Addressing (APIPA).
2
Determine why an APIPA address is assigned to a DHCP client.
APIPA is activated when a DHCP client sends a broadcast request but fails to receive a DHCPOFFER response.
The client self-assigns an address to enable local link communication while indicating a failure to contact the DHCP server.

Key Concept

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

Troubleshooting IP Addressing and DHCP Services

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