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Zorluk: OrtaIP Addressing and Network Configuration

A remote employee reports that their office computer lost connection to corporate network services following a power loss. Executing `ipconfig` on the workstation displays an IPv4 address of 169.254.72.119169.254.72.119 with a subnet mask of 255.255.0.0255.255.0.0, but no gateway entry is present. Which of the following best explains why the workstation assigned itself this specific IP address configuration?

  1. The computer was unable to communicate with a DHCP server and auto-assigned an APIPA address.Cevap
  2. B
    The corporate DNS server went offline and failed to issue a valid network address lease.
  3. C
    The local network switch is operating strictly at Layer 2 and blocking router multicast traffic.
  4. D
    The workstation network interface swapped port 80 HTTP traffic to secure port 443 HTTPS traffic.

Cevap

The workstation was unable to contact a DHCP server to obtain an IP lease, causing it to automatically configure an Automatic Private IP Address (APIPA) in the 169.254.0.0/16 range.
When a host configured for DHCP fails to receive an IP lease from a reachable DHCP server, the operating system uses APIPA to self-assign an IP address in the range of 169.254.0.1 to 169.254.255.254. This allows basic communication with other hosts on the immediate local segment that also use APIPA, but prevents routing beyond the local link due to the lack of a valid default gateway.

Adım Adım Çözüm

1
Analyze the IP address output provided by ipconfig.
The host has an IP address of 169.254.72.119169.254.72.119 and subnet mask 255.255.0.0255.255.0.0.
Addresses within 169.254.0.1169.254.0.1 through 169.254.255.254169.254.255.254 belong to the IPv4 APIPA address block.
2
Identify the underlying mechanism that triggers an APIPA assignment.
APIPA occurs when a DHCP client fails to receive a response from a DHCP server during network initialization.
Operating systems automatically fall back to link-local APIPA addresses to maintain basic communication between local link hosts.
3
Select the option that correctly describes DHCP reachability failure as the root cause.
The workstation failed to reach the DHCP server and auto-assigned an APIPA address.
This directly explains the symptoms and the observed 169.254.x.x IP address generation.

Anahtar Kavram

Automatic Private IP Addressing (APIPA)
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Konular

IP Addressing and Network Configuration

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