A user reports that their desktop computer cannot access any network resources or the internet. A technician opens the command prompt on the computer, runs the `ipconfig` command, and receives an IP address of `169.254.45.12` with a subnet mask of `255.255.0.0`. Which of the following is the most likely cause of this network issue?
- The computer was unable to contact a DHCP server and automatically assigned itself an Automatic Private IP Addressing (APIPA) address.Cevap
- BThe local DNS server is offline and failing to issue dynamic IP address leases to network hosts.
- CThe default gateway router is actively dropping Layer 2 switch traffic within the local subnet boundary.
- DThe workstation's network adapter is configured to request IP configurations using secure HTTPS port 443 instead of HTTP port 80.
Cevap
The client failed to contact a DHCP server, resulting in an automatically assigned APIPA (169.254.x.x) address.
An IP address starting with 169.254.x.x indicates Automatic Private IP Addressing (APIPA). When a network host configured for dynamic IP addressing sends out a DHCP Discover message and does not receive a response from a DHCP server, the operating system self-assigns an APIPA address to allow local Link-Local communication. Because APIPA addresses are non-routable, the workstation cannot access external subnets or the internet.
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Anahtar Kavram
Automatic Private IP Addressing (APIPA)