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Zorluk: KolayTroubleshooting IP Addressing and DHCP Services

A network technician executes `ipconfig` on a workstation that is unable to reach local network resources. The output displays an IPv4 address of 169.254.12.89169.254.12.89 and a subnet mask of 255.255.0.0255.255.0.0. Which of the following is the most likely cause of this issue?

  1. The workstation was unable to contact a DHCP server and self-assigned an Automatic Private IP Addressing (APIPA) address.Cevap
  2. B
    The default gateway router interface residing on the local subnet is offline or improperly configured.
  3. C
    A DHCP relay agent was improperly placed on an internal switch interface, corrupting DNS record lookups.
  4. D
    The network subnet mask was miscalculated during configuration, leaving zero usable host addresses in the pool.

Cevap

The workstation was unable to contact a DHCP server and self-assigned an Automatic Private IP Addressing (APIPA) address.
The correct answer states that the workstation failed to reach a DHCP server and self-assigned an APIPA address. When a DHCP client initiates the DORA process and receives no reply from a DHCP server within a designated timeout period, the operating system assigns a link-local IP address in the 169.254.0.1169.254.0.1 to 169.254.255.254169.254.255.254 range so local subnet communication can still occur.

Adım Adım Çözüm

1
Analyze the IP address output provided in the scenario.
The IP address is 169.254.12.89169.254.12.89.
Recognizing the address space is crucial for determining how the host received its network configuration.
2
Identify the protocol responsible for the 169.254.0.0/16169.254.0.0/16 address range.
The address falls within the APIPA (Automatic Private IP Addressing) link-local range.
Operating systems automatically assign an APIPA address when a DHCP DISCOVER request receives no DHCP OFFER response.
3
Determine the root cause based on APIPA behavior.
The workstation failed to contact a DHCP server to obtain an IP lease.
APIPA is a fallback mechanism used exclusively when dynamic IP configuration fails.

Anahtar Kavram

Automatic Private IP Addressing (APIPA) Diagnosis
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Konular

Troubleshooting IP Addressing and DHCP Services

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