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Difficulty: EasyOSI Model Layers and Functions

A network technician is documenting the bottom four layers of the Open Systems Interconnection (OSI) model for a technical training guide. Which sequence correctly orders these OSI layers starting from Layer 1 up to Layer 4?

  1. 1Physical Layer
  2. 2Data Link Layer
  3. 3Network Layer
  4. 4Transport Layer

Answer

The correct order from bottom to top (Layer 1 to Layer 4) is: Physical Layer, Data Link Layer, Network Layer, and Transport Layer.
Moving bottom-up through the OSI stack begins at Layer 1 (Physical), proceeds to Layer 2 (Data Link), continues to Layer 3 (Network), and reaches Layer 4 (Transport).

Step-by-Step Solution

1
Identify Layer 1
Physical Layer
Layer 1 is the lowest layer of the OSI model, dealing with physical hardware, connectors, and raw bitstream transmission.
2
Identify Layer 2
Data Link Layer
Layer 2 sits directly above Physical and packages raw bits into data frames while using MAC addresses.
3
Identify Layer 3
Network Layer
Layer 3 handles logical network addressing (IPv4/IPv6) and packet routing between different subnets.
4
Identify Layer 4
Transport Layer
Layer 4 provides end-to-end transport services (TCP/UDP), segmenting data and ensuring reliable or connectionless delivery.

Key Concept

OSI Model Layer Ordering (Layers 1 to 4)
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Topics

OSI Model Layers and Functions

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