An office employee reports that their desktop computer lost network access immediately after being moved to a newly assigned cubicle. The workstation's network interface card is configured to obtain IP settings dynamically. Running `ipconfig` displays an IPv4 address of 169.254.14.88 and a subnet mask of 255.255.0.0. Which of the following actions should the technician perform FIRST to address this issue?
- Inspect the Ethernet patch cable and network adapter link lights to verify physical connectivity.Answer
- BReconfigure the workstation's primary DNS server address to lease a dynamic IP configuration.
- CReplace the unmanaged Layer 2 network switch with a Layer 3 router to forward APIPA packets to the gateway.
- DModify the local software firewall rules to open TCP port 80 and TCP port 443 for DHCP discovery.
Answer
Inspect the Ethernet patch cable and network adapter link lights to verify physical connectivity.
An IP address in the 169.254.x.x range demonstrates that the system generated an Automatic Private IP Address (APIPA) due to a failure to reach a DHCP server. Following proper troubleshooting methodology, technicians must verify Layer 1 physical layer connectivity (cables and link lights) before attempting upper-layer software or network infrastructure changes.
Step-by-Step Solution
Key Concept
APIPA Identification and Physical Layer Troubleshooting Sequence
Estimated Time:1m 15s