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Difficulty: EasyOSI Model Layers and Functions

A network technician notices that the LED status indicator on a workstation's Network Interface Card (NIC) remains unlit after connecting an Ethernet patch cable. At which layer of the OSI reference model does this connectivity issue exist?

  1. Physical layerAnswer
  2. B
    Data Link layer
  3. C
    Network layer
  4. D
    Transport layer

Answer

Physical layer
The Physical layer (Layer 1) specifies electrical signaling, cables, patch panels, and hardware link indicators. An unlit NIC link light indicates a failure in physical signaling or media connectivity.

Step-by-Step Solution

1
Analyze the symptom described in the problem.
The symptom is an unlit LED link light on a physical Ethernet connection.
Link lights reflect electrical/optical signals transmitted through physical cables and connectors.
2
Map the hardware component and symptom to its corresponding OSI layer.
Cables, connectors, and physical signal indicators belong to Layer 1.
Layer 1 defines all physical specifications required to establish and maintain electrical links.

Key Concept

OSI Layer 1 (Physical Layer) functions and physical hardware signaling.
Estimated Time:45s
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Topics

OSI Model Layers and Functions

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