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Zorluk: OrtaIP Addressing and Network Configuration

A desktop computer in a newly configured office space cannot access internal network shares or the internet. The network adapter is configured to obtain IP settings automatically. When running `ipconfig /all`, a technician notes an IPv4 address of 169.254.77.149169.254.77.149, a subnet mask of 255.255.0.0255.255.0.0, and blank entries for the default gateway and DNS servers. Which of the following is the most likely cause of this network issue?

  1. The workstation failed to contact a DHCP server and self-assigned an Automatic Private IP Addressing (APIPA) address.Cevap
  2. B
    The primary DNS server is offline and failed to issue an IP address lease to the client workstation.
  3. C
    The workstation was successfully assigned a valid, routable private IP address from an external internet service provider.
  4. D
    The network interface is connected to a Layer 2 switch that requires a Layer 3 router to assign APIPA addresses.

Cevap

The client workstation failed to reach a DHCP server and automatically assigned itself an Automatic Private IP Addressing (APIPA) address.
When a client configured for DHCP fails to receive a response from a DHCP server, the operating system assigns an Automatic Private IP Addressing (APIPA) address in the range of 169.254.0.1169.254.0.1 through 169.254.255.254169.254.255.254. Because APIPA does not configure a default gateway, the system can communicate only with other local hosts on the same subnet.

Adım Adım Çözüm

1
Analyze the output of the IP configuration command.
The client system has an IPv4 address of 169.254.77.149169.254.77.149 and a subnet mask of 255.255.0.0255.255.0.0, with no gateway or DNS server listed.
Identifying the IP address block is essential to determine whether the host received a dynamic lease, a static assignment, or a fallback address.
2
Evaluate the identified IP address block (169.254.0.0/16169.254.0.0/16).
Recognize that 169.254.0.1169.254.0.1 to 169.254.255.254169.254.255.254 is reserved for Automatic Private IP Addressing (APIPA / Link-Local).
Windows automatically assigns an APIPA address when a interface set to automatic IP configuration receives no response from a DHCP server.
3
Determine the root cause based on APIPA assignment rules.
The failure to obtain a standard lease points directly to DHCP server unreachability, network cable disconnects, or VLAN misconfigurations.
APIPA allows local host-to-host communication on the local subnet but lacks a default gateway for internet access.

Anahtar Kavram

Automatic Private IP Addressing (APIPA)
Tahmini Süre:1m 0s
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Konular

IP Addressing and Network Configuration

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