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How many layers are in the OSI reference model?

The OSI reference model has seven layers.

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  1. Four
  2. Five
  3. Seven ✔

Why: OSI divides network communication tasks among seven layers, from physical through application. The model gives engineers a shared vocabulary for locating functions and problems.

Huh, didn't know that: In OSI numbering, Layer 1 is physical and Layer 7 is application.

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The OSI model has layers, but it never needs frosting.
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References

Answer: Seven. OSI divides network communication tasks among seven layers, from physical through application. The model gives engineers a shared vocabulary for locating functions and problems.

  1. IBM: What Is the OSI Model? www.ibm.com/think/topics/osi-model
    a conceptual model that divides network communication and interoperability into seven abstract layers
    Checked 2026-10-11.

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