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Question

Difficulty: EasyWired and Wireless Network Issues

A user's workstation connected to an Ethernet wall outlet suddenly displays a message indicating that the network cable is unplugged. Which of the following actions should a network technician take FIRST?

  1. Inspect the status LED link lights on the network interface card and switch port.Answer
  2. B
    Execute a continuous traceroute command to identify network routing hops.
  3. C
    Reconfigure the network DHCP server settings to issue static IP leases.
  4. D
    Change the local wireless router channel setting to 2.4 GHz channel 4.

Answer

Inspect the status LED link lights on the network interface card and switch port.
Inspecting the link status lights on both the computer's network adapter and the connected network port is the essential first step when troubleshooting a 'cable unplugged' error. The link LED indicates whether an electrical or optical connection is established at the physical layer (Layer 1).

Step-by-Step Solution

1
Identify the reported symptom
The operating system reports a disconnected network cable (Layer 1 failure).
Troubleshooting methodology dictates starting at the physical layer when physical disconnection is reported.
2
Examine physical layer indicators
Check the network interface card (NIC) LED link light and the corresponding switch port link light.
If the link lights are off, there is a physical cable, port, or NIC hardware failure that must be addressed before higher-layer testing.

Key Concept

Physical Layer Network Troubleshooting
Estimated Time:45s
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Topics

Wired and Wireless Network Issues

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