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Difficulty: MediumWired and Wireless Network Issues

A desktop computer in a office environment is unable to access local network resources or the internet. Running `ipconfig /all` on the workstation displays an IPv4 address of 169.254.45.12169.254.45.12. Upon physical inspection, the technician observes that the link light on the workstation's network interface card (NIC) is completely unlit. Which of the following initial troubleshooting steps should the technician perform to address this issue? (Select TWO.)

  1. Test or replace the Ethernet patch cable connected between the workstation and the wall jack.Answer
  2. Verify that the corresponding switch port in the patch panel room is enabled and showing physical link activity.Answer
  3. C
    Reconfigure the local DNS server settings to lease dynamic IP addresses to client workstations.
  4. D
    Manually set the workstation network adapter to operate on non-overlapping 2.4 GHz channel 6.

Answer

The technician should test or replace the Ethernet patch cable and verify that the corresponding switch port is enabled and showing physical link activity.
The presence of an Automatic Private IP Addressing (APIPA) address (169.254.x.x169.254.x.x) combined with an unlit NIC link light points directly to a Layer 1 (Physical layer) failure. Testing or replacing the Ethernet patch cable and verifying that the network switch port is active and enabled directly troubleshoot the physical link layer. Establishing a physical connection is required before the client can reach a DHCP server.

Step-by-Step Solution

1
Analyze the diagnostic output and physical indicators.
The IP address 169.254.45.12169.254.45.12 indicates an APIPA assignment, and the unlit NIC light signifies a physical layer link loss.
Troubleshooting methodology dictates beginning at Layer 1 (Physical layer) when physical link indicators fail.
2
Inspect and test local physical layer cabling.
Testing or replacing the Ethernet patch cable confirms whether cable damage is causing the unlit link light.
Faulty or disconnected patch cables are a primary cause of lost Ethernet link signals.
3
Inspect infrastructure physical layer components.
Verifying that the network switch port is enabled ensures signal transmission from the network infrastructure end.
A disabled port or inactive switch port prevents physical link establishment regardless of client-side configuration.

Key Concept

Physical Layer Network Diagnostics & APIPA Identification
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Topics

Wired and Wireless Network Issues

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